Multiquip Septic System ST 45HRM User Manual

OPERATIONS & PARTS MANUAL  
SERIES  
MODEL ST-45HRM  
STRUCTURAL CONCRETE PUMP  
(HATZ DIESEL ENGINE)  
FINAL REVISION  
Revision #4 (07/16/04)  
THIS MANUAL MUST ACCOMPANY  
THE EQUIPMENT AT ALLTIMES.  
Download from Www.Somanuals.com. All Manuals Search And Download.  
HERE'S HOW TO GET HELP  
HERE'S HOW TO GET HELP  
PLEASE HAVETHE MODEL AND SERIAL  
NUMBER ON-HANDWHEN CALLING  
MULTIQUIP CORPORATE OFFICE  
18910 Wilmington Ave.  
Carson, CA 90746  
800-421-1244  
FAX:310-537-3927  
Email: mq@multiquip.com  
Internet:www.multiquip.com  
PARTS DEPARTMENT  
800-427-1244  
310-537-3700  
FAX:800-672-7877  
FAX:310-637-3284  
MAYCO PARTS  
800-306-2926  
310-537-3700  
FAX:800-672-7877  
FAX:310-637-3284  
SERVICE DEPARTMENT  
800-421-1244  
FAX:310-537-4259  
310-537-3700  
TECHNICAL ASSISTANCE  
800-478-1244  
FAX:310-631-5032  
FAX:310-537-1173  
WARRANTYDEPARTMENT  
800-421-1244,EXT.279  
310-537-3700,EXT.279  
© COPYRIGHT 2004, MULTIQUIP INC.  
Multiquip Inc, the MQ logo and the Mayco logo are registered trademarks of Multiquip Inc. and may not be used, reproduced, or  
altered without written permission.All other trademarks are the property of thier respective owners and used with permission.  
This manual MUST accompany the equipment at all times.This manual is considered a permanent part of the equipment and  
should remain with the unit if resold.  
The information and specifications included in this publication were in effect at the time of approval for printing. Illustrations are  
based on the Mayco ST-45HRM w/ Hatz Diesel Engine. Illustrations, descriptions, references and technical data contained in this  
manual are for guidance only and may not be considered as binding. Multiquip Inc. reserves the right to discontinue or change  
specifications, design or the information published in this publication at any time without notice and without incurring any obligations.  
To find the latest revision of this  
publication, visit our website at:  
www.multiquip.com  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 3  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TABLE OF CONTENTS  
PARTS ILLUSTRATIONS  
MAYCO ST-45HRM  
STRUCTURAL CONCRETE  
PUMP  
Explanation Of Code In Remarks Column ..............64  
Suggested Spare Parts ...........................................65  
Appendix — Recommended  
Proposition 65 Warning .............................................2  
Here’s how To Get Help.............................................3  
Table of Contents ......................................................4  
Parts Ordering Procedures ...................................... 5  
Pump Specifications..................................................6  
Engine Specifications ................................................7  
Dimensions .............................................................. 8  
Safety Message Alert Symbols .......................... 9-10  
Rules for Safe Operation................................... 11-13  
Operation and Safety Decals ............................ 14-15  
Important Hand Signals ..........................................16  
General Information .......................................... 17-18  
How it Works............................................................19  
Pump Components ........................................... 20-21  
Control Box Components ........................................22  
Engine Components ...............................................23  
Operating Procedures....................................... 24-28  
Inspection.......................................................... 29-31  
Initial Start-Up Procedure ................................. 32-35  
Towing Guidelines ............................................. 36-37  
Trailer Safety Guidelines ................................... 38-40  
Towing Information ............................................ 41-42  
Wiring Diagram (Tail Lights)....................................43  
Maintenance (Pump) ........................................ 44-52  
Hydraulic Hose Connections............................. 54-56  
Manifold Port Locations...........................................57  
Appendix — Concrete Mix Information ............. 58-59  
Appendix — Slump Test Procedure ........................60  
Troubleshooting (Engine)........................................61  
Troubleshooting (Hydraulic System) .......................62  
Troubleshooting (Electrical System) .......................63  
Troubleshooting (Brake System).............................64  
Shotcrete System ............................... 66  
Appendix — Recommended  
Shotcrete Accessories........................ 68  
Decal Placement ................................................70-71  
Axle Assembly ....................................................74-75  
Brakeline Assembly............................................76-77  
Hopper Assembly...............................................78-79  
Hopper Attachment Assembly ...........................80-81  
Hopper Interior Assembly ..................................82-83  
Shuttle Cylinder Assembly .................................84-85  
Fuel and Hydraulic Tank Assembly ....................86-89  
Front Cover Assembly........................................90-91  
Heat Exchanger Assembly.................................92-93  
Engine and Frame Assembly .............................94-96  
Throttle and Water Filter Assembly....................96-97  
Hydraulic Pump Assembly .................................98-99  
Lubrication Pistons Assembly ........................100-101  
Electrical System Assembly ...........................102-103  
Accumulator Assembly...................................104-105  
Manifold Assembly .........................................106-107  
Remixer Control Assembly.............................108-109  
Battery Assembly ...........................................110-111  
Lubrication Panel ...........................................112-113  
Taillight Assembly...........................................114-115  
Control Box Interior Door Assembly...............116-117  
Control Box Mounting Assembly ...................118-119  
Control Box Assembly ...................................120-121  
Control Box Door Wiring Diagram ......................... 122  
Control Box Interior Wiring Diagram ..................... 123  
Terminal Block Wiring Diagram ............................. 124  
Control Box Electrical Schematic ...................125-126  
Interconnect Hydraulic Control Box ...................... 127  
Hydraulic Diagram ............................................... 128  
Optional Radio Control.......................................... 129  
NOTE  
Specification and part  
number are subject to  
change without notice.  
Terms and Conditions Of Sale — Parts ................ 130  
Mayco Pump Warranty .......................................... 131  
PAGE 4 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
PARTS ORDERING PROCEDURES  
When ordering parts,  
please supply the following information:  
Dealeraccountnumber  
Dealernameandaddress  
Shipping address (if different than billing address)  
Returnfaxnumber  
Applicable model number  
Quantity,part number and description of each part  
Specifypreferredmethodofshipment:  
FedEx or UPS Ground  
FedEx or UPS Second Day or Third Day  
FedEx or UPS Next Day  
Federal Express Priority One  
DHL  
Note:Unlessotherwiseindicatedbycustomer, all  
orders are treated as “Standard Orders”, and will  
ship within 24 hours.We will make every effort to ship  
“Air Shipments” the same day that the order is  
received, if prior to 2PM west coast time. “Stock  
Orders” must be so noted on fax or web forms.  
Truck  
Place Your Parts Order Via Web or Fax  
For Even More Savings!  
Here’s how to get help...  
Please have the model and serial number  
on hand when calling.  
(Domestic USA Dealers Only)  
MULTIQUIP CORPORATE OFFICE  
18910 Wilmington Ave.  
Carson, CA 90746  
Email: mq@multiquip.com  
Internet: www.multiquip.com  
800-421-1244  
FAX: 310-537-3927  
Extra Discounts!  
All parts orders which include complete part numbers and  
are received by our automated web parts order system, or  
by fax qualify for the following extra discounts:  
Ordered  
via  
Standard  
orders  
Stock orders  
PARTS DEPARTMENT  
800-427-1244  
310-537-3700  
MAYCO PARTS  
800-306-2926  
310-537-3700  
SERVICE DEPARTMENT  
800-421-1244  
310-537-3700  
TECHNICAL ASSISTANCE  
800-478-1244  
WARRANTY DEPARTMENT  
800-421-1244, EXT. 279  
310-537-3700, EXT. 279  
($750 list and above)  
FAX: 800-672-7877  
FAX: 310-637-3284  
Fax  
3%  
5%  
10%  
10%  
Web  
FAX: 800-672-7877  
FAX: 310-637-3284  
Special freight allowances  
when you order 10 or more  
line items via Web or Fax!**  
FedEx Ground Service at no charge for freight  
No other allowances on freight shipped by any other carrier.  
FAX: 310-537-4259  
FAX: 310-631-5032  
FAX: 310-537-1173  
**Common nuts, bolts and washers (all items under $1.00  
list price) do not count towards the 10+ line items.  
NOTE:DISCOUNTSARESUBJECTTOCHANGE  
MULTIQUIP INC.  
Direct TOLL-FREE access  
to our Parts Department:  
18910WILMINGTONAVENUE  
POST OFFICE BOX 6254  
CARSON, CALIFORNIA 90749  
310-537-3700 • 800-421-1244  
FAX:310-537-3927  
Toll-free nationwide — 800-427-1244  
E-MAIL:mq@multiquip.com  
INTERNET:www.multiquip.com  
Toll-free FAX — 800-6-PARTS-7 (800/672-7877)  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 5  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — PUMP SPECIFICATIONS  
Table 1. ST-45 Pump Specifications  
Pumping Method  
Pumping Rate  
Reciprocating Piston  
Up to 45 cu. yds. per hour*  
1-1/2 in. minus (38mm)  
Maximum Aggregate Size  
Vertical Pumping Height  
Horizontal Pumping Distance  
Cylinder Lubrication Box Capacity  
Hydraulic Fluid Capacity  
Fuel Tank Capacity  
Up to Excess of 250 ft. (76m)  
1000 ft. (305m)*  
7 Gallons (26.5 Liters)  
58 Gallons (219 Liters)  
20 Gallons (76 Liters)  
Hopper Capacity  
10 cu. ft. with optional fwd/rev remixer  
3 in., 4 in., 5 in. dia.  
(76.2mm, 101.6 mm, 127 mm)  
Material Hose  
Remote Control (25 ft. cable)  
Dimensions  
optional  
See Page 16  
Weight (with fluids)  
Weight (dry/shipping)  
Tire Size  
4,206 lbs. (9,274 kg)  
4,040 lbs. (8,908 kg)  
7.35 in. x 14 in. (187 mm x 356 mm)  
* Volume output will vary depending on mix design, slump, line size used and job site condititons  
PAGE 6 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — ENGINE SPECIFICATIONS  
Table 2. Engine Specifications  
Model  
HATZ 3M41 57HP DIESEL ENGINE  
4.02 in. x 4.13 in.  
(102 x 105 mm)  
Bore X Stroke  
Compression Ratio  
Displacement  
18.7  
157 cu. (2,573 cc)  
Lube Oil Capacity  
Max/Min  
9.1 qt. / 5.4 qt.  
(8.6 L / 5.1 L)  
Engine  
Engine Speed  
Full Idle  
875 rpm 100  
Battery Type  
12 V (88/143 Ah)  
SAE 10W-30 (Oil Grade)  
SG or SF (Service Class)  
Engine Lubrication  
Starting Method  
Dry Net Weight  
Electric Start  
562 lbs (255 kg)  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 7  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — DIMENSIONS  
TABLE 3. DIMENSIONS  
REF.  
DIMENSIONS  
45 in. (114.3 cm.)  
162 in. (411.5 cm.)  
24 in. (61 cm.)  
A
B
C
D
E
73 in. (185.4 cm.)  
68 in. (172.2 cm.)  
Figure 1. ST-45 Structural Concrete Pump Dimensions  
PAGE 8 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — SAFETY MESSAGE ALERT SYMBOLS  
HAZARD SYMBOLS  
FORYOUR SAFETY ANDTHE SAFETY OF OTHERS!  
Safety precautions should be followed at all times when operating  
this equipment. Failure to read and understand the Safety  
Messages and Operating Instructions could result in injury to  
yourself and others.  
Lethal Exhaust Gases  
Diesel engine exhaust gases contain poisonous  
carbon monoxide. This gas is colorless and  
odorless, and can cause death if inhaled.  
NEVER operate this equipment in a confined  
area or enclosed structure that does not  
provide ample free flow air.  
This Owner's Manual has been  
developed to provide complete  
instructions for the safe and efficient  
operation of the Multiquip Mayco  
ST-45 Structural Concrete pump.  
Refer to the engine manufacturers  
instructions for data relative to its safe  
operation.  
Explosive Fuel  
Before using this pump , ensure that the operating  
individual has read and understands all instructions in this  
manual.  
Diesel fuel is extremely flammable, and its  
vapors can cause an explosion if ignited. DO  
NOT start the engine near spilled fuel or  
combustible fluids. DO NOT fill the fuel tank  
while the engine is running or hot. DO NOT  
overfill tank, since spilled fuel could ignite if it  
comes into contact with hot engine parts or  
sparks from the ignition system. Store fuel in  
approved containers, in well-ventilated areas  
and away from sparks and flames. NEVER  
use fuel as a cleaning agent.  
SAFETY MESSAGE ALERT SYMBOLS  
The three (3) Safety Messages shown below will inform you  
about potential hazards that could injure you or others. The  
Safety Messages specifically address the level of exposure to  
the operator, and are preceded by one of three words: DANGER,  
Burn Hazards  
DANGER: You WILL be KILLED or  
SERIOUSLY injured if you do not follow  
directions.  
Engine components can generate extreme heat.  
To prevent burns, DO NOT touch these areas  
while the engine is running or immediately after  
operations. NEVER operate the engine with  
heat shields or heat guards removed.  
WARNING: You CAN be KILLED or  
SERIOUSLY injured if you do not follow  
directions.  
Rotating Parts  
CAUTION: You CAN be injured if you  
NEVER operate equipment with covers, or  
guards removed. Keep fingers, hands, hair  
and clothing away from all moving parts to  
prevent injury.  
do not follow directions  
Potential hazards associated with operation of the pump will be  
referenced with Hazard Symbols which appear throughout this  
manual, and will be referenced in conjunction with Safety  
Message Alert Symbols.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 9  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — SAFETY MESSAGE ALERT SYMBOLS  
Accidental Starting  
Respiratory Hazard  
ALWAYS place the ON/OFF switch in the OFF  
position. NEVER perform maintenance on the  
unit with the ignition key in the ON position.  
ALWAYS wear approved respiratory  
protection.  
Over Speed Conditions  
Sight and Hearing hazard  
NEVER tamper with the factory settings of the  
engine governor or settings. Personal injury  
and damage to the engine or equipment can  
result if operating in speed ranges above  
maximum allowable.  
ALWAYS wear approved eye and  
hearing protection.  
This pump, other property, or the  
surrounding environment could  
be damaged if you do not follow  
instructions.  
Equipment Damage Messages  
Other important messages are provided throughout this manual  
to help prevent damage to your concrete pump, other property,  
or the surrounding environment.  
PAGE 10 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — RULES FOR SAFE OPERATION  
Whenever necessary, replace nameplate, operation and  
safety decals when they become difficult read.  
CAUTION:  
Failure to follow instructions in this manual may  
lead to serious injury or even death! This  
equipment is to be operated by trained and  
qualified personnel only! This equipment is  
for industrial use only.  
Manufacture does not assume responsibility for any accident  
due to equipment modifications.  
NEVER use accessories or attachments, which are not  
recommended by Multiquip for this equipment. Damage to  
the equipment and/or injury to user may result.  
The following safety guidelines should always be used when  
operating the ST-45 structural concrete ump:  
NEVERtouchthehotexhaustmanifold,  
muffler or cylinder.Allow these parts to  
cool before servicing engine or pump .  
GENERAL SAFETY  
DO NOT operate or service this equipment  
beforereadingthisentiremanual.  
HighTemperatures – Allow the engine to cool before adding  
fuel or performing service and maintenance functions. Contact  
with hot! components can cause serious burns.  
This equipment should not be operated by persons under 18  
years of age.  
NEVER operate this equipment without proper protective  
clothing, shatterproof glasses, steel-toed boots and other  
protective devices required by the job.  
The engine section of this pump requires an adequate free  
flow of cooling air. NEVER operate the pump in any enclosed  
or narrow area where free  
flow of the air is restricted. If  
the air flow is restricted it  
will cause serious damage  
to the pump or engine and  
may cause injury to  
people. Remember the  
pump's engine gives off  
DEADLY carbon monoxide  
gas.  
NEVER operate this equipment when not feeling  
well due to fatigue, illness or taking medicine.  
ALWAYS refuel in a well-ventilated area, away from sparks  
and open flames.  
NEVER operate this equipment under the  
influence or drugs or alcohol.  
ALWAYS use extreme caution when  
working with flammable liquids. When  
refueling, stop the engine and allow it to  
cool.  
ALWAYS check the machine for loosened threads or bolts  
before starting.  
NEVER smoke around or near the machine.  
Fire or explosion could result from fuel  
vapors, or if fuel is spilled on a hot! engine.  
ALWAYS wear proper respiratory (mask), hearing and eye  
protection equipment when operating the pump .  
NEVER operate the pump in an explosive  
atmosphere or near combustible materials. An explosion or  
fire could result causing severe bodily harm or even death.  
Topping-off to filler port is dangerous, as it tends to spill fuel.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 11  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — RULES FOR SAFE OPERATION  
Transporting  
ALWAYS remove the ignition key when leaving the pump  
unattended.  
ALWAYS shutdown engine before transporting the pump.  
Tighten fuel tank cap securely and close fuel valve to prevent  
fuel from spilling.  
ALWAYS block the wheels on the unit when using on a  
slope.  
Drain fuel when transporting pump over long distances or  
bad roads.  
ALWAYS maintain this equipment in a safe operating  
condition at all times.  
Towing  
ALWAYS stop the engine before servicing, adding fuel or oil.  
Before towing, check the hitch and secure the safety chain to  
the towing vehicle.  
NEVER run engine without air filter. Severe engine damage  
may occur.  
When towing, an adequate safety chain must be fastened to  
the frame, refer toTowing Guidelines.  
ALWAYS be sure the operator is familiar with proper safety  
precautions and operation techniques before using pump.  
Tow only with a vehicle and hitch rated to pull a 5,000 lbs.  
load.  
ALWAYS store equipment properly when it is not being used.  
Equipment should be stored in a clean, dry location out of  
the reach of children.  
If unit is equipped with ball hitch coupler, use only 2" all steel  
ball rated for minimum of 5,000 lbs. Use 1" hardened steel  
pull pin, if not equipped with ball hitch.  
DO NOT operate this equipment unless all guards and safety  
devices are attached and in place.  
This equipment shall not be towed or operated by individuals  
who cannot read understand the signs, decals or operating  
instructions.  
CAUTION must be exercised while servicing this equipment.  
Rotating and moving parts can cause injury if contacted.  
Keep all inexperienced and unauthorized people away  
from the equipment at all times.  
When towing at night, always have rear tail lights ON.  
DO NOT tow unit with hopper full of material.  
DO NOT tow unit with hoses attached.  
Before start-up, check the hopper and remove all foreign  
matter and debris.  
DO NOT use worn or damaged hose couplings, inspect all  
hoses and couplings for wear.Replace any worn or defective  
hose or couplings immediately.  
DO NOT tow unit in excess of 45 MPH on highways..  
Maintenance Safety  
Keep hands out of the hopper when the engine is running.  
NEVER lubricate components or attempt service on a running  
pump .  
DO NOT operate unit with the hood open.  
ALWAYS allow the pump a proper amount of time to cool  
DO NOT disconnect hose couplings or nozzle while under  
pressure. Relieve pressure by manually activating pressure  
relief valve at manifold.  
before servicing.  
Keep the pump in proper running condition.  
Unauthorized equipment modifications will void all  
warranties.  
Fix damage to the pump immediately and always replace  
broken parts.  
Check all fasteners periodically for tightness. Also check  
towing tongue bolt, lock nut and wheel lug nuts for wear.  
Dispose of hazardous waste properly.Examples of potentially  
hazardous waste are used motor oil, fuel and fuel filters.  
Test the pump's ON/OFF switch.The purpose of this test is  
to shut down the engine.  
DO NOT use plastic containers to dispose of hazardous  
waste.  
Refer to the HATZ Engine Owner's Manual for engine  
technical questions or information recommended by  
Multiquip for this equipment. Damage to the equipment and  
or injury to user may result.  
PAGE 12 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — RULES FOR SAFE OPERATION  
Battery  
Emergencies  
The battery contains acids that can cause injury to the eyes and  
skin.To avoid eye irritation, always wear safety glasses.Use well  
insulated gloves when picking up the battery. Use the following  
guidelines when handling the battery:  
ALWAYS know the location of the nearest fire extinguisher.  
1. DO NOT drop the battery.There is the possibility of risk that the  
ALWAYS know the location of the nearest and first aid kit.  
battery may explode.  
2. DO NOT expose the battery to open  
flames, sparks, cigarettes etc. The  
battery contains combustible gases  
and liquids. If these gases and liquids  
come in contact with a flame or spark,  
an explosion could occur.  
3. ALWAYS keep the battery charged.If the battery is not charged  
In emergencies always know the location of the  
nearest phone or keep a phone on the job site.  
Also know the phone numbers of the nearest  
ambulance, doctor and fire department. This  
information will be invaluable in the case of an  
emergency.  
a buildup of combustible gas will occur.  
4. ALWAYS keep battery charging and cables in good working  
condition. Repair or replace all worn cables.  
5. ALWAYS recharge the battery in an vented air environment,  
to avoid risk of a dangerous concentration of combustible  
gases.  
6. In case the battery liquid (dilute sulfuric acid) comes in contact  
with clothing or skin, rinse skin or clothing immediately with  
plenty of water.  
7. In case the battery liquid (dilute sulfuric acid) comes in contact  
with your eyes, rinse eyes immediately with plenty of water,  
then contact the nearest doctor or hospital, and seek medical  
attention.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 13  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — OPERATION AND SAFETY DECALS  
Machine Safety Decals  
The ST-45 structural concrete pump is equipped with a number of safety decals.These decals are provided for operator safety and  
maintenance information. Figure 1 below illustrates these decals as they appear on the machine. Should any of these decals  
become unreadable, replacements can be obtained from your dealer.  
Figure 2. ST-45 Operation and Safety Decals  
PAGE 14 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — OPERATION AND SAFETY DECALS  
Figure 3. ST-45 Operation and Safety Decals  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 15  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — IMPORTANT HAND SIGNALS  
Figure 1 display's the basic hand signals commonly used in concrete pumping operations.  
Figure 4 Operation Hand Signals  
PAGE 16 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — GENERAL INFORMATION  
Concrete Mix Design  
There are four ways in which this seal can be lost:  
Mix design is most important to achieve maximum pumpability.  
Pumpability is affected by, among other factors, the type and  
gradation of aggregate used. Natural aggregates make a more  
workable mix and pump more readily than crushed aggregates.  
A blend of natural and crushed aggregates will produce a  
workable mix.The type and gradation of aggregates is equally  
important for workability as the size and percentage of coarse  
aggregates in the mix.  
1. By pumping excessively wet mixes which do not have  
enough cohesion to hold together.  
2. By pumping harsh undersanded concrete with poorly graded  
aggregates which can jam together when the pressure  
becomes too great for the insufficient amount of sand to  
hold the aggregates apart.  
3. By getting a rock pocket, such as mixer tailings, into the  
pump valve.This rock pocket will have an insufficient coating  
of mortar and the mix will not be plastic enough to allow the  
valve to operate or the mix to move in the line.  
The term “aggregates” describes all of the solid materials, from  
the largest rock to the smallest grain of sand, contained in the  
concrete mix.  
4. Through excessive bleeding.If the mix is short or fines, but  
the sand is otherwise fairly well graded, bleeding will not  
normally create any problems as long as the pump continues  
operation. But, if the pump is shut down, bleeding can result  
in a loss of lubrication and blocked erratic flow.  
Concrete mixes with a consistency as dry as one-inch slump  
and as wet as ten-inch slump have been pumped; but for  
maximum efficiency from the pump, a slump ranging from two to  
six inches will produce a more workable mix than one that  
contains more or less water.  
The above are bad concrete practices, regardless of how the  
mix is to be placed. But, these points do show that special mixes  
are not always needed, within limits, for pumping concrete. Good  
aggregate gradation is most important to pump concrete the  
maximum distance.  
The principle of concrete pumping is based on self-lubrication.  
As it moves through the transfer line, the concrete takes the  
shape of a plastic cylinder.It is forced through the transfer line on  
a film of mortar that is self-troweled to the service of the transfer  
line around its full periphery by the slug of concrete itself.  
The use of admixtures can have a beneficial effect on pumpability.  
Most of the dispersing agents will fatten, retard bleeding, and  
increase workability.Thus, the average concrete can be pumped  
for appreciably longer distances. Air entraining agents will also  
improve workability, although they cannot be used as a substitute  
for good gradation of the aggregate. Pumping will not appreciably  
affect the final air content of the mix. High-early cement tends to  
give a more readily pumpable mix with superior water retaining  
qualities.However, if delays are likely to occur, extra care must  
be exercised due to the faster setting time over regular cement.  
A slump rating should be used with discretion; it is not always a  
real indication of the pumpability of the mix.The concrete may  
be workable in the sense that it will readily flow into place, but  
the same mix may not respond to pressure. Overly wet mixes  
tend to separate. In addition to affecting the strength and quality  
of the concrete, the delivery system will not tolerate separation.  
Overly dry mixes are similarly unsatisfactory if they lack plasticity  
and tend to be crumbly.To be properly pumped, the mix must be  
able to continuously coat the inside of the line with a lubricating  
seal of mortar.  
The Mayco Model ST-45 will pump a wide variety of concrete  
pump mixes. But, there are guidelines that must be followed.  
Use this information in conjunction with the Operating  
Procedures (pages 24-28).  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 17  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — GENERAL INFORMATION  
5. The proper amount of water to make a workable slump and  
plasticize the mix.  
Regional Differences  
Concrete is made by mixing locally available rock and sand with  
cement and water.For this reason there are great differences in  
the pumpability of concrete from one region of the country to  
another.  
In addition, the Mayco Structural Concrete ST-45 Pump can be  
used to pump a large aggregate hard rock as follows:  
1. Pea rock (1/2" minus) pump with mixes being as low as 30%  
rock and 70% sand. (See page 44, for comments on cleaning  
the pump.)  
It is impossible to define a specific mix for each region that the  
Model ST-45 be will working in.Therefore, the mixes on pages  
58-59 will provide a basic guideline for establishing the proper  
mix design for your area.  
2. Shortening pea rock when used with an air compressor  
and nozzle.(See back pages for recommended set-up.)  
Use this information to specify your requirements to your local  
ready-mix batch plant, contractor and civil engineer.It may take  
minor adjustments to make a mix pumpable, so you should  
explain your needs.  
3. “Mud Jacking”, high pressure grouting.  
The elements that have to be controlled and consistently  
maintained by the batch plant are:  
1. The sizing and mix percentage of rocks, gap graded from  
the largest down through the smallest sizes.  
2. Sand with a sieve analysis that has the proper percentage  
of fines, ASTM C33 spec.  
3. Sufficient cement to produce the required design strength  
of the concrete and provide the lubricating binder to pump  
the concrete through the delivery system.  
Use a minimum of:  
500 lbs. of cement/cu yd for 2500 p.s.i. concrete after 28  
days.  
530 lbs. of cement/cu yd for 3000 p.s.i. concrete after 28  
days.  
600 lbs. of cement/cu yd for 4000 p.s.i. concrete after 28  
days.  
4. Admixture pump-aid if necessary.  
PAGE 18 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HOW ITWORKS  
The following is a brief explanation of how the concrete cylinders,  
hydraulic cylinders, shuttle tube, valves and hopper work in  
sequence to pump concrete.  
The hydraulic pressure is generated by a variable volume,  
pressure compensated, axial piston pump that is driven by a  
diesel engine. The rod sides of the drive cylinders are  
hydraulically connected together creating aslave circuit,which  
allows hydraulic oil to transfer from one piston to the other.  
The two part cycling sequence is initiated by an electrical signal  
generated by two proximity switches located in the drive cylinder.  
The proximity switches are normally open, magnetically sensing  
the movement of the main drive cylinder. As the drive cylinder  
piston head passes the proximity switch, an electrical signal is  
sent to the solenoid operated pilot valve which in turn directs  
pilot oil to the four valves controlling the drive cylinder and the  
shuttle cylinder.  
A one-gallon accumulator assists the movement of the shuttle  
tube.This circuit assures that the shuttle tube will throw with the  
same intensity of each stroke regardless of how fast the main  
drive cylinders are cycling.  
Figure 6. Pumping Cycle 2  
In the first cycle, hydraulic pressure is applied to cylinder (B),  
causing the hydraulic piston, which is connected to the concrete  
piston and piston cup, to discharge concrete into the delivery  
line (Figure 5).  
As one cylinder is discharging concrete, the hydraulic oil from  
the rod side (B) of the drive cylinders is being transferred through  
the slave circuit causing the opposite cylinder (A) to move back  
on the suction stroke, filling the cylinder with concrete.  
The shuttle tube is sequenced to pivot to each concrete cylinder  
as the drive cylinders stroke to push concrete. As the second  
cycling sequence begins (Figure 6), the shuttle tube pivots to  
the opposite cylinder (A). The hydraulic piston passes under the  
proximity switch and sends pressure to the piston, causing it to  
stroke and discharge concrete into the delivery line. Hydraulic  
oil is transfered through the slave circuit to cylinder B, causing it  
to start a suction stroke, refilling it with concrete.The pumping  
sequence then repeats for the durration of the operation.  
Figure 5. Pumping Cycle 1  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 19  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — PUMP COMPONENTS  
PAGE 20 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — PUMP COMPONENTS  
Figure 7 illustrates the location of the major components  
for the ST-45 Structural Concrete Pump. The function of  
each component is described below:  
13. Lubrication Panel – This console allows for the remote  
lubrication of components on the pump.  
14. Rear Running Lights – ALWAYS check and make sure  
both the right and left running lights are functioning correctly  
before towing the pump.  
1. Tow Hitch Coupler – Requires a 2-inch ball hitch or a  
3-inch pintle. Capable of towing 5,000 lbs.  
2.  
Documentation Box – Contains engine and pump  
operation, parts and maintenance information.  
15. Accumulator Stores hydraulic oil under pressure and  
releases it to the shuttle cylinder and provides the  
required pressure to activate the hydraulic system.  
3. Hydraulic OilTank/Cap– Remove cap to add hydraulic  
fluid. Fill with Shell Oil Tellus 68 or Mobil Oil DFE26 if  
level is low.  
16. Remixer Control Lever – Controls the forward/reverse  
motion of the hopper remixer paddles.  
4.  
FuelTank/Cap – Fill with diesel fuel.Fuel tank (cell) holds  
approximately 20 gallons (88 liters). DO NOT top off fuel.  
Wipe up any spilled fuel immediately  
17. Manifold Aluminum block that controls the flow of  
hydraulic pressure to the various hydraulic motors and other  
components required to control the pump.  
5. Battery This unit uses a +12VDC type battery.ALWAYS  
18. Hydraulic Pump – This unit incorporates an axial variable  
use gloves and eye protection when handling the battery.  
displacement hydraulic piston pump.  
6.  
Heat Exchanger – Reduces temperature of the hydraulic  
oil.The exchanger draws oil from the hydraulic tank through  
a filter and into the heat exchanger before allowing it to  
flow into the hydraulic system.  
19. Throttle Control Knob – This is a variable speed type  
control. Turning the throttle lock (CCW) left unlocks the  
throttle allowing the throttle control cable to be pulled out to  
the desired position. Once the desired throttle position  
(speed) has been achieved, turning the throttle lock to the  
(CW) right locks it in place. Use the fine tune adjustment  
knob to fine tune the engine rpm's.  
7.  
Lubrication Box – This box is empty when shipped  
from the factory.Please fill with 7 gallons ( 26.5 liters) of  
SAE motor oil for first time use. Also check the dual  
clean-out point on bottom of lubrication box for a secure  
tight fit.  
To place the engine in idle, press the top button inward all  
the way..  
8.  
9.  
Tires — This trailer uses two ST205-750 x14C type tires.  
Tire inflation pressure is the most important factor in tire  
life. Pressure should be checked to 50 psi cold before  
operation. DO NOT bleed air from tires when they are hot.  
Check inflation pressure weekly during use to insure the  
maximum tire life and tread wear.  
20. StrokeVolume Control Dial – Turns CW/CCW to increase  
or decrease the number of strokes per minute of the pump.  
21. Control Box – Contains the mechanical and electrical  
components required to run the pump. See page 22 for  
components.  
22. Tow End Jack Stand – Use this jack stand to level and  
Shuttle Cylinder – Under pressure, the shuttle cylinder  
shears concrete passing from the concrete cylinder to  
the delivery line durring the cycle phase. The  
Accumulator provides the pressure needed to ensure  
enough force is provided during cycle.  
support the tow end of the pump.  
23. Pumping Pressure Gauge – Used to monitor pressure in  
the concrete cylinders and shuttle tube.  
24. Accumulator Pressure Gauge– Used to monitor  
accumulator pressure. Pressure should read at least 1750  
psi for correct pump operation.  
10. Pump End Jack Stand – Use this jack stand to level  
and support the rear end of the pump. NEVER deploy  
on un-level ground and always check for firmness of  
ground.  
25. Hydraulic Oil Sight Glass – Use to determine the  
amount of hydraulic oil remaining in tank. The sight  
glass also contains a temperature gauge for monitoring  
the temperature of the hydraulic oil.  
11. Hopper/Hood – Lift hood to fill. Concrete from a Redi-Mix  
truck is poured into this hopper.The hopper can hold 10 cu.  
ft of concrete with optional forward/reverse mixer.NEVER  
put hands or any other parts of you body into the hopper.  
26. Hopper Discharge Sleeve – Connect hoses or steel  
pipes to the discharge sleeve for pouring concrete.  
12. Remixer Motor – Drives the remixer paddles inside  
the hopper. The motor direction is controled by the  
remixer control lever.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 21  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX COMPONENTS  
Figure 8. Pump Control Box Components  
1. Engine Tachometer – Monitors the engine RPM’s and  
8. Direction Control Switch– This 2 position switch controls  
the direction of flow for any mix in the pump. The center  
position sets the pumping direction to forward and the right  
most position sets the pumping direction to reverse.  
hours of operation for the engine.  
2. Emergency Stop Button – Press emergency stop button  
to stop pump in an emergency.Turn knob counter clockwise  
to disengage the stop button.  
9. Pump Operation Switch– This 2 position switch controls  
the operation of the pumping components and engine. The  
center position allows the operation of the pump and  
engine and the right most position allows only the engine  
to operate.  
3. Hourmeter Display's the number of hours the pump has  
been in use.  
4. Ignition Switch – Insert the ignition key here to start the  
engine.Turn the key clockwise to the “ON“ position, then  
continue turning clockwise to the “START“ position and  
release. To stop the engine turn the key fully counter-  
clockwise to the “STOP“ position.  
10. PressureTest Switch– Activates a self-diagnostic routine  
which tests the pressure of the pumping system, which can  
be read on the Pumping Pressure Gauge.  
11. Pumping Control Switch This 3-position switch controls  
the pumping of the pump.The left most position is for use  
with the remote control unit, the center position is for  
normal pumping operation, and the right most position  
(OFF) prevents pumping.  
5. Battery Indicator Lamp– Indicates a low battery charge.  
Replace or charge battery. NEVER operate the ST-45 when  
this lamp is on.  
6. Oil Pressure Indicator Lamp– When lit, indicates correct  
operational pressure for running the ST-45.NEVER operate  
the ST-45 if this lamp is off.  
12. Cooling Fan Switch – If hydraulic oil temperature exeeds  
75° F, set the pump operation switch to engine and turn the  
cooling fan switch to the right most position to activate  
cooling fan.  
7. Air Filter Indicator Lamp – Indicates the engine air filter  
is functioning properly. NEVER operate the ST-45 if this  
lamp is off.  
13. Remote Cable Connector – Insert the remote control input  
cable into this connector.  
PAGE 22 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — ENGINE COMPONENTS  
Figure 9. Pump Control Box Components  
INITIAL SERVICING  
The pump's engine (Figure 9) must be checked for proper  
lubrication and filled with fuel prior to operation. Refer to the  
manufacturers Engine manual for instructions & details of operation  
and servicing.  
6. Air Filter/Cover – Prevents dirt and other debris from  
entering the fuel system. Release the latches on the side of  
the air filter cover to gain access to filter element.  
7. Starter/Solenoid This engine uses a 12 VDC , 2.7kW  
1. Muffler Used to reduce noise and emissions. NEVER  
touch the muffler while it is hot! Serious burns can result.  
NEVER operate the engine with the muffler removed.  
(3.7 HP) starter motor with solenoid.  
8.  
Front Oil Drain Plug – Remove this plug to drain engine  
oil from the engine crankcase. For best results drain engine  
oil when oil is warm.  
2.  
Dip Stick – Remove dipstick to determine if the engine oil  
level is low. If low add oil as specified inTable 4, page 30.  
9. V-Belt Cover – Remove this cover to gain access to theV-  
belt.When replacingV-belt , use only recommended type  
V-belt.  
3. Speed Control Lever – This lever is connected to the  
throttle control which is located on the side of the engine  
compartment cover. Use this lever to control engine speed.  
Operating the engine without an air  
filter, with a damaged air filter, or a filter  
in need of replacement will allow dirt  
to enter the engine, causing rapid  
engine wear.  
4.  
Oil Filter – Prevents dirt and other debris from entering the  
engine. Service the oil filter as recommended in the  
maintenance section of this manual.  
5.  
Side Oil Drain Plug – Remove this plug to drain engine  
oil from the engine crankcase. For best results drain engine  
oil when oil is warm.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 23  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — OPERATING PROCEDURES  
C. Ifitisnecessarytowait10minutesormoreforanother  
loadofconcrete,itiswisetostartthepumpandpump  
OPERATING SUGGESTIONS  
1. Awell-plannedlocationofthepumpandroutingofthehose  
beforestartingapourmaysavesubsequentmovesthrough-  
out the job.  
6or8strokesevery5minutestopreventsettingofthe  
mixinthesystem.Ifwaitingtimeisexcessive,itwould  
bewisetowashoutthepumpandhosesandstartover  
when the new truck arrives.  
2. Beforeconcreteisdischargedintothehopper,itissuggested  
that 3 to 4 gallons of water be sprayed into the hopper,  
followedbyapproximately5gallonsofacreamycementand  
water slurry (1/2 bag of cement to 5 gallons of water).This  
procedurelubricatesthehoseandpreventsseparationand  
blockages in the hose.  
D. When pumping stiff mixes and there is waiting time  
between redi-mix trucks, it is advisable to add some  
watertothelasthopperofmaterialandhandmixto  
ensure an easier start with the following load.  
E. When the pumping job requires a stiffer mix, the  
following method is suggested for starting: Take a  
water hose with a nozzle on it and apply water with a  
fine spray to the concrete as it comes down the redi-  
mix chute into the pump hopper after the slurry  
procedure is completed and you are ready to start  
pumping.  
Getting the concrete to flow through  
the hose at the start of the pumping  
cycle can be one of the most critical  
operations of the pour. (Manually  
operate the throttle when starting,  
NOTREMOTELY)  
Using this procedure will make it easier to pump  
throughthecleanhose.Note:Oncetheconcretehas  
reached the end of the hose, do not apply any more  
water in this manner as this procedure is used for  
starting only.  
CAUTION  
If hoses or lines are blocked for any reason,  
or if the lines are kinked when starting up or  
during the pumping cycle, the pump  
pressure could straighten out the kink or  
force out the blockage. This rapid surge of  
material could cause the lines to whip or  
move in a manner that could cause injury to  
personnel.  
F. Hose sizing is very important: We strongly recom-  
mendonharshmixes,verticalpushes,stiffconcrete,  
shotcrete, long pushes, that a 2 -1/2” line be used as  
faraspossible.Theadvantagesofusingthe2-1/2”line  
areimprovedpumpability,lesspumpingpressureand  
less wear on the pump.  
Inspect the lines at all times to prevent the above conditions  
3. It is important that once the slurry procedure is completed,  
and you have started concrete flowing through the hose, do  
not stop the pour until all the slurry is pumped out and the  
concrete has reached the end of the hose.The only time to  
stop the pump at the start is if a blockage occurs.  
5. Followingthepumpoperation, properwashoutofallmate-  
rials or “build-up” within the pump manifold and hoses will  
prevent problems when starting the next job.  
6. Athoroughinspectionofthedrivecomponentsandgreasing  
ofallbearingsaftereachjobwillensureadequatelubrication  
andservicetothepumpwhichisnormallyoperatinginwet,  
grittyconditions.  
4. Whenthepumpisstoppedforanyreasonduringapour;e.g.,  
movinghose,waitingforredi-mixtruck,thefollowingsugges-  
tionsareoffered:  
A. Leave the hopper full of concrete at the time of  
shutdown.Itisimportantnottolettheredi-mix driver  
wash too much water into the hopper, as this could  
cause separation of the concrete in the hopper.  
Over-greasing any bearing on  
yourMaycopumpwillnotdamage  
thebearing.  
B. Iftheshutdownperiodexceeds2to3minutes,turn  
offtheenginesothevibrationdoesnotseparatethe  
mixinthehopperwhichcancauseablockageinthe  
manifold when the pump is started.  
PAGE 24 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — OPERATING PROCEDURES  
B. MBVR – air entraining, acts as a lubricant.  
WARNING  
C. Calcium Chloride – commonlyreferredtoasC.C.,is  
Common sense tells us that if you drive a  
used as an accelerator. When pumping a load with  
calciumchloride, itisrecommendedthatyouwashout  
ifthewaitingtimebetweendeliverytrucksbecomestoo  
long.  
truck into a brick wall, something is going to  
be damaged.The same holds true with your  
concrete pump. If you repeatedly pull the  
throttle all the way out and try to force your  
pump to push through blockages due to  
D. Super Plasticizers – acts as an accelerator.The  
concrete will look very wet after the super plasticizer is  
added, but will begin to set up very fast.Wash out  
immediately if you do not have a truck waiting. Super  
plasticizers are used mainly on commercial jobs.  
separation of material in the hose or manifold, you will soon  
have breakdowns and costly repairs which are not covered  
under warranty.If a blockage occurs, find where it is and clear it  
before further pumping.DO NOT increase the engine speed to  
clear the blockage. Increasing the engine speed will only  
compound the problem.  
E. RedLabelactsasawaterretarderandanaccelerator.  
Red label will be used mainly on commercial jobs.  
WARNING  
F. Fly Ash – is used to help increase the strength of the  
concrete and decrease the cement content per yard.  
This is one of the most common admixtures used.  
It will be necessary at times to move your  
pump from one job site location to another.  
Before moving the pump, make sure to pump  
the remaining concrete out of the hopper.  
Moving the pump with a full hopper of  
concrete can cause severe damage or  
breakage of the axle and axle springs, excess  
strain and pressure on the hub and bearing assembly.  
All admixtures will be shown on the  
redi-mix concrete ticket.Before start-  
ing the pumping job, ask the driver of  
the redi-mix truck to see the concrete  
ticket and note the admixtures that  
exist and take the proper action.  
Pumping Tips  
The effects of heat and excessive time on concrete:  
10. Whenpumpinglongdistanceorpumpingstiffmixes,youcan  
expectadropinvolumecomparedtoshorterlinesandwetter  
mixes due to the change in valve efficiency or cavitation.  
7. Hot concrete, commonly referred to as a hot load, is concrete  
that has been in the redi-mix truck in excess of 2 to 3 hours.  
On a hot day, this amount of time is even less. A brief  
explanation of why heat and time affect concrete:  
11. Leakingmanifoldsealsorhosecouplinggasketswhichleak  
watercancauseseparationandsubsequentjammingatthat  
point.  
8. Concrete starts setting by drying up through a chemical  
reaction.Thecatalysttothisreactionisheat.Whenpumping  
ahotload,itisimportanttorememberthatwhenyouhaveto  
stoppumpingforanyreason,addwatertotheconcreteinthe  
hopper and hand mix and move concrete in the hose every  
5minutes.Iftheshutdowntimebecomestoolong,washout  
immediately.  
Priming the Pump and Delivery System with Slurry  
12. It is CRITICAL to the successful operation of a concrete  
pump that the manifold and all delivery hose, pipe and  
elbows are coated with a film of lubrication BEFORE you  
attempt to pump concrete. Failure to properly prepare the  
pump and system will result in a “dry pack” of concrete,  
blocking the shuttle valve tube or delivery line.  
Admixtures:  
9. Remixtures that are designed into the concrete mix by the  
redi-mixcompanyoranarchitecturalengineeringcompany.  
This section lists common admixtures and a brief explana-  
tionoftheirfunctions:  
A. With the entire delivery system connected to the pump.  
Except for the first hose.Pour 5 gallons of water into the  
second hose and push in your clean out ball and  
reconnect.This will help hold back the prime.  
A. Pozzolith 300 – or the equivalent acts as a water  
retarderandalubricant.Onaleanmix,longpushes,stiff  
mixes, and vertical pushes, Pozzolith 300R helps  
pumpability.  
B. There are several things you can use for the prime. A  
few examples are Cement and lime at a 50/50 mixture,  
slick pac, bentonite clay.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 25  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — OPERATING PROCEDURES  
C. Mix the prime to the consistency of a smooth batter.  
16. Theshuttletubeispluggedifvolumeatthedischargeendof  
thehosestops,the hoseissoftandthehydraulicoilpressure  
gauge reads 3000 psi or more.  
D. Position the first ready-mix truck at the hopper.Check  
the concrete.DO NOT discharge concrete into hopper  
at this time.  
To clear a plug in the shuttle tube, great care must be taken  
as a dangerous condition will exist from pressure build-up  
inside the shuttle tube. (With the shuttle valve, the concrete  
can be pumped in reverse.) Use the following prodedures  
to clear the shuttle tubes.  
The bentonite is not compatible with  
concrete. DO NOT pump it into the  
forms discharge it out of the formed  
area.  
WARNING  
E. Pour approximately two 5 gallon buckets of prime into  
the first hose and connect it to the pump.  
DO NOT open any of the  
delivery system joint clamps.  
F. With the pump in FORWARD at 25-30 strokes per  
minute, slowly discharge the concrete from the ready-  
mix truck into the hopper and completely fill it.Keep the  
pump running continuously until concrete is discharging  
at the end of the delivery system. If the pump is stopped  
during this procedure, a blockage may occur.  
“Reverse” Pumping Procedure  
A. Switch the pump into reverse. With pump speed at a  
medium-slow (approx. 12 strokes per min.) try to pull  
the “pack” back into the hopper with 5 or 6 reverse  
strokes.  
G. If it is necessary to replace or add a section of delivery  
system, after the initial lubrication procedure, wet the  
inside area of the hose, pipe or elbow with 5 gallons of  
water per 25 foot length, before adding it to the system.  
B. Remix the concrete in the hopper.  
C. Switch the pump into forward. If it is still plugged, repeat  
“Reversing” procedure three times.  
Clearing Concrete Blockage  
If concrete still does not move, proceed to the Shuttle Tube  
Inspection Procedure.  
13. Damaged hoses with internal restrictions can cause block-  
ages.  
Shuttle Tube Inspection Procedure  
A. Stop the pump.Switch off the engine.  
14. If a blockage occurs in a hose, walk the hose until you find  
thepointoftrouble.Thehosewillbesoftimmediatelypastthe  
blockage.Ifthishappensatthestart,disconnectthehoseat  
the first coupling past the blockage.  
B
The senior or most experienced operator must warn all  
others to stand at least 20 feet away from the machine  
and turn their heads to face away from the pump.  
15. Elevatethehoseatthatpointwiththeblockageareahanging  
down. Using a hammer, you can pound the down-stream  
edgeofthepackedareauntilitisfreetoflow.Shakeallofthe  
sandandgravelouttotheendofthehose.Beforereconnect-  
ing the hose, start the pump and run a small amount of  
concrete out to the end of the hose.This will assure that all  
of the separation is out of the hose.  
CAUTION  
Saftey glasses MUST be worn at all times  
when operating the ST-45. Failure to fol-  
low saftey guidlines can result in serious  
injury.  
CAUTION  
C. The operator will position themself beside the reducing  
elbow at the pump outlet. Wearing safety glasses,  
slip the end of a pry bar (24" length of reinforcing steel  
rod) under the latch of the hose clamp and flip it up.  
Use extreme care! The hose line is under  
pressure and can cause serious injury.  
PAGE 26 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — OPERATING PROCEDURES  
D. Carefully knock the end of the hose away from the  
If, for any reason, the mix should set up in the system, the  
following procedure (E through H) is suggested:  
reducer.  
E. Chip the concrete out of the reducer with the pry bar.  
E. Disconnectthehosefromthepumpandwashthepump  
outimmediately.  
F. Remove the reducer.  
From the discharge end,  
chip the concrete out of the shuttle tube with the pry-bar.  
If concrete cannot be loosened from the outlet of the  
shuttle tube, remove the clean-out plug on the bottom  
of the hopper to discharge the concrete.  
F. Reconnect the hose and fill the hopper with water.  
G. Reconnectthehoseandfillthehopperwithwater.DO  
NOT try to push all the concrete out of all of the hose  
lines at one time.  
G. The senior operator may then remove the inspection  
cover plate from the shuttle tube by using a long  
extension wrench and the 24" pry bar.  
Forexample:Ifyouhad200ft.ofsystemout,youwould  
disconnect each hose. Clean it out by pushing water  
through the first hose off the pump, then continue  
progressing through all the hoses, until all the system  
is clean.  
WARNING  
Make sure the accumulator pressure gauge  
reads ZERO psi. prior to performing any  
maitinance or inspection.  
H. Ifwaitingtimeisexcessive,itwouldbewisetowashout  
thepumpandhosesandstartoverwhenthenewtruck  
arrives.Thiscanbeavoidedbybeingobservanttothe  
pump and system, also taking into consideration the  
above factors (E through H) affecting the mix.  
H. Chip the blockage out with the pry-bar.  
I. Flush the shuttle tube with water.  
18. Down-Hill Pumping – can be difficult on some jobs.The  
slurry procedure would be the same as explained on the  
pages titled Operating Suggestions. It is suggested that a  
sponge 2”x 4”x 6” be placed in the hose before the start of  
pumping.Wet the sponge before placing it in the hose.  
J. Replace and seal the inspection cover plate on the  
shuttle tube.  
K. Before resuming operation of the pump, perform the  
“Reverse” Pumping Procedure to relieve pressure on  
the shuttle tubes.  
Thereasonforusingthewetspongeistokeeptheslurryfrom  
running too far ahead of the concrete and so reducing the  
possibility of separation. When the pump is stopped, the  
materialcanflowslowlydown,duetogravity,andcausethe  
hose to collapse.  
17. If it is necessary to wait 1/2 hour or more for another load  
of concrete, and to prevent setting of the mix in the system,  
it is advisable to consider the following factors  
(A through D) affecting the concrete :  
Whenpumpingisresumed,youcanexpectblockageatthe  
point of hose collapse.To prevent this from happening, the  
hosecanbe“kinkedoff”atthedischargeendwhenthepump  
is stopped to prevent the gravity flow of the material in the  
hose.  
A. How old is the concrete?  
B. Isthereanaccelerator,calciumchloride,redlabel,etc.,  
in the concrete?  
C. The temperature of the day, 80, 90, degrees?  
The use of stiffer mixes when pumping down-hill will de-  
creasegravityflowofthematerialinthehoseandwillassure  
a smoother operation between the cam roller bearing and  
cam plate.As with any job, make sure that the hose and the  
couplings are in good workable shape.  
D. Howmuchsystemyouhaveoutandhowstiffwasthemix  
you were pumping?  
When disconnecting hoses, use  
19. VerticalPumpingWhenpumpingverticallyupthesideof  
a building, above 40 feet, we would recommend the instal-  
lationofsteelpipesecurelyfastenedatintervalsasnecessary  
tosupportthepipe.Ninetydegree,longradiuspipesweeps  
should be installed at the top and bottom of the steel line.  
EXTREME CAUTION! The hose is  
under pressure!  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 27  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — OPERATING PROCEDURES  
Use a 25 ft.hose, or short section, off the pump;and for the  
entire drive system and valving under simulated full load  
conditions.Thepumpownercandothesamebymakingan  
adaptertocoupletotheendofthedischargecone:e.g.,the  
use of a standard 2" pipe cap with a 3/8" drilled hole in the  
center, screwed on to the end of hinged cone or reducer at  
thepump.  
balance of the horizontal distance to the vertical line, use  
steel pipe.This type of installation has been satisfactory on  
many jobs being pumped in excess of 100 feet high. Line  
pressures are always less using steel pipe as compared to  
hose.  
Whenpumpingvertically,usingallhose,itisrecommended  
not to go higher than 50 feet with hose.The hose should be  
tied off at intervals of 10 feet, if possible. Special attention  
shouldbegivenwhentieingthehoseoffatthetopasthehose  
willhaveatendencytostretchwhenfilledwithconcrete.This  
willincreasethepossibilityofablockageatthepointwhere  
the hose is tied off.To avoid this, a long radius of 90 degree  
elbowisrecommended.Thesuggestedplacetotieoffison  
the hose, under the clamp.  
Fillhopperwithwateraftermakingsurethatallsandandrock  
have been removed from manifold. Operate pump at full  
throttle and the 3/8" diameter hole restriction will create  
sufficient back pressure to make thorough inspection of all  
movingparts.  
It is strongly recommended that  
steel pipe be used on all vertical  
pumping for safety and conve-  
nience.  
20. Pulsation – A slight pulsation of the hose will always be  
noticeable near the pump.Excessive pulsation of the hose  
near the pump is normally due to higher than average line  
pressures caused by stiff, harsh mixes, or extremely long  
pumpingdistances.  
Theuseof2-1/2I.D.hoseintheseextremecasesreduces  
linepressuresortheadditionofslightamountsofwatertothe  
mix, if permissible, will permit easier pumping.The use of  
certain pumping admixtures may help.  
Ifexcessivepulsationexistsinthehose,itisadvisabletouse  
burlaporsomemeansofwearprotectionunderthehoseat  
pointswherethehosemaywearthroughtheoutercover;e.g.  
overforms, steelorsharpcurbs.  
21. Snap-Joint – When using Snap-Joint couplings with gas-  
ketstojoinhose, seethattheyarewashedcleanaftereach  
job.Keepingthehoseendsclean(heavyduty)isveryimpor-  
tantforthebestjobsetup.Athincoatofgreaseontherubber  
gasket or dipping both coupling and gasket in water before  
coupling the hose will make for easier installation.  
22. NewPumpsAllnewpumpsarewaterpressuretestedat  
thefactoryThisprocedurepermitsathoroughinspectionof  
PAGE 28 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — INSPECTION  
FUEL CHECK  
CAUTION  
5.  
Read the fuel sight tube (Figure 10) on top of the fuel tank  
to determine if the pump's engine fuel is low .  
NEVER operate the pump  
in a confined area or  
enclosed area structure  
that does not provide  
ample free flow of air.  
ALWAYS wear approved eye and hearing  
protection before operating the pump .  
NEVER place hands or feet inside the hopper. ALWAYS make  
while the engine is running. ALWAYS shut-down the engine  
before performing any kind of maintenance service on the pump.  
NEVER operate the pumps's engine with the  
engine hood removed.The possibility exists of  
hands, long hair, and clothing becoming  
entangled with the V-belt, causing injury and  
bodily harm.  
See Figures 5 & 6 on pages 20-22 for  
the location of any control or  
component referenced in this section.  
Figure 10. Fuel SightTube  
Before Starting  
6.  
If fuel is low, remove fuel filler cap and fill with #2 diesel  
fuel (Figure 11).  
1. Read safety instructions at the begin-  
ning of manual.  
2. Cleantheentirepump,removingdirtanddust,particularly  
the engine cooling air inlet, and air filter.  
3. Check theairfilter for dirtanddust. Ifairfilterisdirty,replace  
air filter with a new one as required.  
4. Checkfasteningnutsandboltsfortightness.  
CAUTION:  
Handle fuel safely. Diesel fuel is highly  
flammable and can be dangerous if  
mishandled. DO NOT smoke while refueling.  
DO NOT attempt to refuel mixer if the engine is  
hot or running. ALWAYS allow engine to cool  
before refueling.  
Figure 11. Adding Diesel Fuel  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 29  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — INSPECTION  
ENGINE OIL CHECK  
12 The oil listed in Table 47 is recommended to ensure  
better engine performance. Use class CD or higher grade  
motor oil.  
7.  
Remove the engine oil dipstick from its holder (Figure 12).  
Figure 12. Engine Oil Dipstick  
8. Make sure pump/engine is placed on level ground.  
9. Pull the engine oil dipstick (Figure 13) from its holder.  
Hydraulic Oil  
13. Determine if the hydraulic oil level is low by observing the  
level of the oil in the Hydraulic Oil Sight Glass (Figure 14).  
Figure 14. Hydraulic Oil Sight Glass  
Figure 13. Engine Oil Dipstick  
10. Verify that oil level (Figure 13) is maintained between  
the two notches on the dipstick.  
11. If the pump's engine oil is low, fill engine crankcase  
with lubricating oil through filler hole, but DO NOT overfill.  
PAGE 30 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — INSPECTION  
14. If the hydraulic oil level is low, remove the cap just above the  
oil level sight glass (Figure 15) and add the correct amount  
of hydraulic oil to bring the hydraulic oil level to a normal  
safe operating level. (Use Shell oil Tellus 68 or Mobil oil  
DFE26).  
16. Remove the cotter pin from the handle tee bolt eye, and  
then pull the handle tee to release the stabilizer stand  
(Figure 17).  
17. Position both rear stabilizers stands on firm (not loose)  
level ground (Figure 18).  
18. Align the hole on the stabilizer stand with the hole on the  
frame body and insert handle tee bolt.  
19. Insert the cotter pin into handle tee bolt eye to lock the  
stabilizer stand.  
Figure 15. Hydraulic Oil Filler Hole  
REAR STABILIZER STAND  
To reduce excessive vibration and rocking of the ST-45 Concrete  
Pump, set the rear stabilizers as follows:  
Figure 17. Rear Stablizer Stand  
15. Locate both the left and right rear stabilizer stands  
(Figure 16).  
Figure 18. Rear Stablizer Stand Deployment  
Figure 16. Locatiing Rear Stabilizer Stands  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 31  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — INITIAL START-UP PROCEDURE  
IGNITION SWITCH  
Starting  
3. To start the engine, insert the key (Figure 20) into the ignition  
switch and turn the key to the ON position.  
CAUTION :  
DO NOT attempt to operate this concrete  
pump until the Safety, General Information  
and Inspection sections have been read  
and understood.  
EMERGENCY STOP SWITCH  
1. Locate the Emergency Stop Switch (Figure 19) on the  
Hydraulic Pump Control Box. Use this switch in the event of  
a emergency.  
Figure 20. Ignition Switch  
4. Observe that the Batter,Air Filter and Oil Pressure status  
indicator lights are “ON” (Figure 21).  
OIL  
AIR FILTER  
BATTERY  
PRESSURE  
Figure 19. Emergency Stop Switch  
2. Turn the Emergency Stop switch counter-clockwise (open).  
This will allow the engine to start.  
Figure 21. Status Indicator Lights  
A. Turn the key to the “START“ position and listen for the  
engine to start.  
B. In warm weather let engine warm-up for 5 minutes. In  
cold weather let engine warm-up for 10 minutes.  
If the Emergency Stop switch is in the  
CLOSED” position (stop), engine will  
not start. To start the engine, make  
sure the Emergency Stop switch is in  
the “OPEN” position (fully extended).  
C. The Air Filter,Oil Pressure and Battery indicator lights  
(Figure 21) should all be “OFF”.  
The battery indicator light may remain  
on if the engine is idling, or on some  
models of the ST-45. Increasing the  
engine RPM’s slightly should correct  
the problem.  
Place all switches on the Hydraulic  
Control Box in the ”OFF” (up position).  
CAUTION :  
If any of the status indicator lights referenced  
in the ignition section (step 4) remain “ON”,  
turn off the engine and correct the problem.  
DO NOT continue to run the equipment.  
PAGE 32 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — INITIAL START-UP PROCEDURE  
CONTROL SWITCH  
8. While monitoring the tachometer,  
(Figure 25) use the Engine  
Throttle Control to set the engine  
speed to 1500 RPM by following  
steps 8A-8C.  
5. Turn the Pump Control switch (Figure 22)  
to the “ON” position, a thumping sound  
(cylinder stroke) should be heard. The  
thumping sound represents the number  
of strokes per minute (volume) of the  
pump.  
Figure 25. Engine  
Tachometer  
A. Unlock the throttle cable.To unlock the throttle cable, turn  
the inner most knob counter clockwise (Figure 26.)  
Figure 22. Pump Control Switch  
UNLOCKING  
KNOB  
6. Turn the Volume Control (Figure 23), lock nut  
counterclockwise (CCW) to release the volume control  
knob.  
UNLOCK  
THROTTLE  
ADJUSTMENT  
KNOB (COARSE)  
(PUSH/PULL)  
LOCK  
THROTTLE  
ADJUSTMENT  
KNOB (FINE)  
(TURN CW/CCW)  
Figure 26.Throttle Control Knob (Un-locking)  
B. Push the outermost button, Figure 27 (coarse adjust-  
ment) inward, then pull outward until engine RPM  
reaches desired speed.  
Figure 23. Volume Control  
6. Use the volume control, to set the  
pump volume to approximately 10  
strokes per minute.Turning the  
volume control clockwise (CW)  
will decrease pump volume,and  
counterclockwise (CCW) will  
increase pump volume.  
C. Turn the unlocking knob (figure 26) clockwise to lock  
engine RPM in place.  
PUSH-IN, THEN PULL  
TO SET THROTTLE  
(RPM’s)  
Figure 24. Hydraulic Oil Temperature Gauge  
7. Let the pump cycle until the hydraulic oil temperature  
(Figure 24) is approximately 50 to 60 degrees fahrenheit.  
Use a wristwatch or stop watch to  
determine the number of pump  
strokes within 1 minute.  
PUSH ALL THE WAY IN  
TO IDLE ENGINE  
Figure 27.Throttle Control Knob (RPM Adjust)  
9. Turn the Control Off switch (Figure 10) to theOFF“ position.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 33  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — INITIAL START-UP PROCEDURE  
ENGINE SPEED  
13. Make sure the Operation Pump/Engine  
switch is in the “ENGINE“ position  
(Figure 28), and that only the engine is  
running.  
10. Turn the Operation Pump/Engine switch  
to the “ENGINE” position (Figure 28).  
Figure 28. Operation Pump Engine  
Switch  
14. Turn the fan switch (Figure 30) to the “ON“  
position and listen for fan to start.  
Figure 30. Fan On/Off Switch  
15. Turn the fan switch to the “OFF“ position and listen for fan  
The pump should not be cycling at this  
time. Only the ENGINE should be  
running.  
to stop. If machine exceeds 170°F or to cool the machine  
down, turn the operation switch (Figure 28) back to the  
ENGINE“ position. Run engine at high RPM with cooling  
fan on for 10 to 15 minutes.  
PRESSURE TEST  
11. While  
monitoring  
the  
tachometer (Figure 25), use the  
EngineThrottle Control to set  
the engine speed to 2550 RPM  
(maximum speed) using steps  
8A-8C  
16. The Pressure Test switch (Figure 31) is a  
self-diagnostic test switch, that when  
activated will test the pressure of the system.  
This switch will be discussed in the  
maintenance and troubleshooting section  
of this manual.  
12. The Accumulator Pressure  
Gauge (Figure 29) should read  
approximately 1750 pounds per  
square inch (psi).  
Figure 31. Pressure Test On/Off Switch  
Figure 29. Accumulator Pressure Gauge  
HOPPER REMIXER CONTROL  
A. Located to the left of the Hydraulic Temperature gauge is  
the Hopper Remixer Control lever (Figure 32).  
COOLING FAN  
This section is intended to make sure the fan is working properly.  
Under normal conditions the fan should be turned on when the  
hydraulic oil temperature begins to approach 75 degrees  
fahrenheit.  
B. Turn the Operation Pump/Engine switch to the “ENGINE“  
position (only the engine should be running).  
CAUTION  
If the hydraulic oil temperature exceeds 170  
degrees fahrenheit, shut down the pump.  
DO NOT continue to operate the pump.  
Failure to shut down the pump will result in  
severe damage to the pump.  
Figure 32. Hopper Remixer Control Lever  
PAGE 34 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — INITIAL START-UP PROCEDURE  
C. Push the Hopper Remixer Control lever “DOWNWARD“  
(Figure 31) and observe that the blades (Figure 33) inside  
the hopper are turning in a clockwise direction (forward).  
Figure 35. Handheld Remote Cable Unit  
CYLINDER LUBRICATION BOX  
Figure 33. Hopper Remixer Blades (Rotation)  
WARNING  
D. Push the Hopper Remixer Control leverUPWARD“ (Figure  
32) and observe that the blades (Figure 33) inside the  
hopper are turning in a counter-clockwise direction  
(reverse).  
Before checking lubricaton level, stop the  
engine and remove the engine starter key.  
We recommend using soluble type oil (water  
& oil mixture). The oil level should be  
checked every day prior to pumping. The oil  
level should be maintained at a height of 5  
inches or about ½ the concrete cylinder  
height.  
OPTIONAL RADIO REMOTE CONTROL  
14. The MAYCO ST-45 Concrete Pump has a remote control  
feature that allows the pump to be remotely controlled. If  
desired, the pump can be operated via a receiver/transmitter  
method (Figure 34) or a hardwire method, which utilizes a  
25-ft.extension cable.The manual remote cord (Figure 35)  
should be installed under the main control box. Contact  
your MAYCO representative for further information.  
Important Notice! During freezing  
temperature after pumping, completely  
drain the water box and cover the  
hopper. Frozen liquid will restrict the  
piston travel and cause severe  
damage to the pump.  
15. As the rubber piston cups naturally wear, fine cement  
particles will accumulate in the box.Once the concrete paste  
reaches a height of about ½ inch from the bottom.The box  
should be drained and cleaned.To clean, remove the drain  
plug located at the bottom of the box.  
Once the box is drained, start the engine and stroke the  
cylinder (keep hands out of box) ten to fifteen times.While  
stroking, spray water inside of the box to thoroughly clean  
out all contamination.When the box is clean, replace drain  
plug, add new lubrication and install the top cover.  
Figure 34. Handheld Receiver/Transmitter  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 35  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TOWING GUIDELINES  
Towing Safety Precautions  
Check wheel mounting lug nuts with a torque wrench.  
Torque wheel lug nuts as described in the "Lug NutTorque  
Requirements",Table 7.  
CAUTION  
Make sure brakes are synchronized and functioning properly.  
Check tightness of suspension hardware (nuts and bolts).  
Check with your county or state safety  
towing regulations department before  
towing your concrete pump.  
Avoid sudden stops and starts.This can cause skidding, or  
jackknifing. Smooth, gradual starts and stops will improve  
gas milage.  
To reduce the possibility of an accident while transporting the  
pump on public roads, always make sure that the trailer and  
the towing vehicle are in good operating condition and both  
units are mechanically sound.  
Avoid sharp turns to prevent rolling.  
Retract wheel stand when transporting.  
DO NOT transport pump with fuel in the fuel tank.  
The following list of suggestions should be used when towing  
the pump:  
CAUTION  
If the trailer coupler is deformed replace  
entire coupler. NEVER tow the pump with  
a defective trailer coupler.There exist the  
possibility of the trailer separating from the  
towing vehicle.  
Make sure that the hitch and coupling of the towing vehicle  
are rated equal to, or greater than the trailer "gross vehicle  
weight rating" (GVWR).  
ALWAYS inspect the hitch and coupling for wear. NEVER  
tow the light tower's trailer with defective hitches, couplings,  
chains etc.  
PumpTrailerVehicle Connection  
CHECK the tire air pressure on both the towing vehicle and  
the trailer.Also check the tire tread wear on both vehicles.  
1. Check the vehicle hitch ball, and trailer coupler for signs of  
wear or damage. Replace any parts that are worn or  
damaged before towing.  
ALWAYS make sure the trailer section of the pump is  
equipped with a "Safety Chain".  
2. Use only the 2-inch ball diameter with a towing capability of  
5,000 lbs. (2,268 kg) as indicated on the trailer's coupler.  
Use of any other ball diameter will create an extremely  
dangerous condition which can result in separation of the  
coupler and ball or ball failure.  
ALWAYS attach trailer's safety chain to frame of towing  
vehicle.  
ALWAYS make sure that the vehicle and trailer directional,  
backup, brake, and trailer lights are connected properly and  
are working properly.  
3. Be sure the coupler is secured to the hitch ball and the lock  
lever is down (locked).  
Remember in most cases the maximum speed unless  
otherwise posted for highway towing is 45 MPH, however  
before towing your pump, check your local state, and county  
vehicle towing requirements. Recommended off-road towing  
is not to exceed 10 MPH or less depending on type of terrain.  
4. Attach safety chains as shown in Figure 36. Remember to  
cross the safety chains.  
5. After towing for about 50 miles recheck the entire towing  
system for tightness.  
Place chocked blocks underneath wheel to prevent rolling,  
while parked.  
Recommended Maintenance  
1. Smear ball socket and clamp face with chassis grease.  
Periodically oil pivot points and were surfaces of coupler  
with SAE 30W motor oil.  
Depending on soil conditions and location it may be  
necessary to place support blocks underneath the trailer's  
bumper to prevent tipping, while parked.  
2. When parking or storing the concrete pump, keep the coupler  
off the ground so dirt and other debris will not build up in the  
ball socket.  
Inflate tires to correct pressure, inspect tires for cuts, and  
excessive wear.SeeTable 5 (Tire WearTroubleshooting).  
PAGE 36 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TOWING GUIDELINES  
Figure 36 shown below illustrates the typical towing  
application that should be used when towing the pump.  
Figure 36.Towing Applications  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 37  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TRAILER SAFETY GUIDELINES  
8. WheelHubThewheelhubisconnectedtothetrailer'saxle.  
Trailer Safety Precautions  
9. TireRimTiresaremountedonatirerim.Thetirerimmust  
CAUTION  
match the size of the tire.  
ALWAYS make sure that the trailer is in good  
operating condition. Check the tires for  
10. Lug Nuts Used to secure the wheel to the wheel hub.  
Alwaysuseatorquewrenchtotightendownthelugnuts.See  
Table 7and Figure 38 for lug nut tightening and sequence.  
proper inflation and wear. Also check the  
wheel lug nuts for proper tightness.  
11. Axle – This trailer employes a torsion bar type suspension,  
which can support 3,500 lbs.  
12. ElectricalElectricalconnectors(looms)areprovidedwith  
the trailer so that brake lights and turn signal lights can be  
connected to the towing vehicle. See Figure 43 for proper  
wiringconnections.  
This section is intended to provide the user with trailer service  
and maintenance information. Remember periodic inspection of  
the trailer will ensure safe towing of the equipment and will  
prevent damage to the equipment and personal injury.  
It is the purpose of this section to cover the major maintenance  
components of the trailer.The following trailer components will  
be discussed in this section:  
Tires  
Lug Nut Torquing  
Suspension  
Electrical  
The following list defines the major trailer components:  
1. FrameLengthThismeasurementisfromtheballhitchto  
therearbumper(reflector).  
3. FrameWidthThismeasurementisfromfendertofender.  
4. Jack Stand – Trailer support device with maximum pound  
requirement from the tongue of the trailer.  
5. CouplerTypeofhitchusedonthetrailerfortowing.Thisunit  
employes a 2" ball.  
6. TiresSizeIndicatesthediameterofthetireininches(10,  
12,13,14,etc.),andthewidthinmillimeters(175,185, 205  
etc.).The tirediametermustmatchthediameterofthetirerim.  
This unit employes 7.35" X 14" tires.  
7. TiresPlyThetire ply(layers)numberisratedinletters;2-  
ply, 4-ply, 6-ply, 8-ply, 10-ply etc.This unit employes 4-ply  
tires.  
PAGE 38 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TRAILER SAFETY GUIDELINES  
Tires/Wheels/Lug Nuts  
ALWAYS wear safety glasses when  
removing or installing force fitted  
parts.Failure to comply may result in  
serious injury.  
Tires and wheels are a very important and critical  
components of the trailer. When specifying or replacing the  
trailer wheels it is important the wheels, tires, and axle are  
properly matched.  
CAUTION  
Table 6. Suspension Torque Requirements  
DO NOT attempt to repair or modify a wheel.  
DO NOT install an inter-tube to correct a  
leak through the rim. If  
the rim is cracked, the  
air pressure in the  
3/8" U-BOLT  
7/16" U-BOLT  
1/2" U-BOLT  
MIN-30 MAX-35  
MIN-45 MAX-60  
MIN-45 MAX-50  
inter-tube may cause pieces of the rim to  
explode (break-off) with great force and  
can cause serious eye or bodily injury.  
SNUG FIT ONLY. PARTS MUST ROTATE FREELY.  
LOCKING NUTS OR COTTER PINS ARE PROVIDED TO  
RETAIN NUT-BOLT ASSEMBLY  
SHACKLE BOLT  
SPRING EYE BOLT  
SHOULDER TYPE  
SHACKLE BOLT  
MIN-30 MAX-50  
TiresWear/Inflation  
Tire inflation pressure is the most  
important factor in tire life. Pressure should  
be checked cold before operation. DO  
NOT bleed air from tires when they are  
hot. Check inflation pressure weekly during  
use to insure the maximum tire life and  
tread wear.  
Suspension  
The leaf suspension springs and associated components  
(Figure 37) should be visually inspected every 6,000 miles  
for signs of excessive wear, elongation of bolt holes, and  
loosening of fasteners. Replace all damaged parts  
(suspension) immediately. Torqed suspension components  
as detailed in Table 6.  
Table 5 (Tire Wear Troubleshooting) will help  
pinpoint the causes and solutions of tire wear  
problems.  
Figure 37. Major Suspension Components  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 39  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TRAILER SAFETY GUIDELINES  
Lug Nut Torque Requirements  
It is extremely important to apply and maintain proper wheel  
mounting torque on the trailer. Be sure to use only the fasteners  
matched to the cone angle of the wheel. Proper procedure for  
attachment of the wheels is as follows:  
1. Start all wheel lug nuts by hand.  
2. Torque all lug nuts in sequence. See Figure 38. DO NOT  
torquethewheellugnutsallthewaydown.Tighteneachlug  
nut in 3 separate passes as defined byTable 7.  
Table 7. Lug Nut Torque Requirements  
Wheel Size  
First Pass  
FT-LBS  
Second Pass  
FT-LBS  
Third Pass  
FT-LBS  
12"  
13"  
14"  
15"  
16"  
20-25  
20-25  
20-25  
20-25  
20-25  
35-40  
35-40  
50-60  
50-60  
50-60  
50-65  
50-65  
90-120  
90-120  
90-120  
3. Afterfirstroaduse,retorquealllugnutsinsequence.Check  
all wheel lug nuts periodically.  
NEVER! use an pneumatic air gun  
to tighten wheel lug nuts.  
Figure 38. Wheel Lug NutsTightening Sequence  
PAGE 40 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 TOWING INFORMATION  
Towing Information  
5. To make sure that the actuator is securely latched onto the  
ball, extend the trailer tongue jack to the ground and lift the  
truck and trailer combination 2" to 4". If the ball does not  
disengage, the actuator is securely attached.  
WARNING  
6. Insert a padlock or bolt through the lock hole for added  
protection.  
Use jack stand to lift tongue.DO NOT lift by  
hand as back injury could result.  
7. Connect the break-away cable solidly to the bumper or frame  
of the tow vehicle as near to the center as possible. The  
cable must hang clear of the trailer tongue and be long  
enough to permit short radius turns without pulling the  
breakaway cable forward.  
CAUTION  
The ball capacity must be greater than or  
equal to the trailer GVWR. Do not use a worn  
hitch ball, it is unsafe and must be replaced.  
USE 2" BALL ONLY  
8. Make sure the breakaway cable is in a released position  
with the indicator bead touching or resting against the cable  
spring stop.(Figure 40).  
Take care not to damage the actuator  
when backing up the towing vehicle  
for hook-up.  
1. Position actuator ball socket above 2" ball.  
2. Hold the release lever in the open position (Figure 39).  
3. Lower the trailer tongue until the ball rests in the ball socket.  
4. Close the release lever.  
Figure 40. Trailer Hitch Release Handle  
CAUTION  
DO NOT use the breakaway cable as a  
parking brake.  
9. Cross the safety chains under the tongue and securely attach  
them to the bumper or frame of the tow vehicle. Check with  
local and state laws for proper compliance.  
CAUTION  
Figure 39. Trailer Hitch Release Lever  
Safety chains must ALWAYS be used.  
CAUTION  
The release lever will close freely with finger  
pressure when the ball is properly inserted  
into ball socket. If the release lever does not  
close freely, do not tow the pump. DO NOT  
force the release handle into the closed  
position.  
Check the location of the breakaway  
cable periodically during each trip. The  
indicator should rest against the  
spring stop.Accidental application will  
cause the brakes to drag and heat up,  
causing a failure.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 41  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 TOWING INFORMATION  
5. If the pump is to be uncoupled from the tow vehicle after  
backing with the lever knob engaged, block all pump wheels  
and pull forward slightly to take strain off of the actuator.  
Uncouple the actuator by lifting the release handle and raising  
the trailer tongue.Make sure the lever knob is in the “Towing  
Positionwhen uncoupling from the trailer.  
10. Retract the jack fully. Remove and store the caster, if  
applicable.  
11. Check for proper truck-trailer hook-up; the tow vehicle and  
trailer should be level with a positive tongue load.For further  
information, consult a dealer or Atwood Service Center.  
12. The direction lever must be positioned in the “Towing  
Position(Figure 41).  
CAUTION  
Before towing the pump, always ensure that  
the directional lever (Figure 41) has been  
disengaged and is in the “Towing Position.”  
Figure 41. Towing Hitch Direction Lever  
13. Do not use the Atwood brake actuator with a sway controller,  
unless prior Atwood Engineering approval of the sway  
control system has been received.  
14. You are now ready to tow your pump.  
CAUTION  
Avoid sharp turns.This could bend, create  
extreme stress or fracture either the actuator  
or trailer tongue.  
BACKING UP  
1. Refer to the previous steps 1 through 14 forTowing.  
2. Before backing up a slope or through soft ground, pull the  
trailer forward slightly to assure that the actuator socket is in  
the fully forward position.  
3. Move the directional lever on the side of the actuator  
downward from theTOWINGposition along the curved slot  
in the actuator frame to theBACK-UPposition (Figure 41).  
The slot has a notch at the bottom of its travel. Push the  
directional lever down to engage the locking notch.  
4. Back the trailer up.  
PAGE 42 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — WIRING DIAGRAM (TAIL LIGHTS)  
Figure 42. TrailerTail LightsWiring Diagram  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 43  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
TABLE 8. ST-45 MAINTENANCE CHECK SCHEDUAL  
Daily  
Hourly  
Weekly Monthly  
6-Months  
Operational Hours  
Engine Oil  
Engine Air Filter  
X
X
X
X
Fuel Filter  
Hydraulic Oil Level  
Lubrication Box  
X
500 hrs.  
X
X
Replace Hydraulic Oil  
Clean Hydraulic Filters  
Axle Crank  
X
2100 hrs.  
2 hrs  
X
X
Grease Shuttle Tube Zerk Points  
Grease Remix Bearing  
Check System Pressure  
Check Hardware for Tightness  
Check Cutting Ware Ring  
Check Trailer Brakes Function  
Check Brake Lights  
X
X
X
40 hrs.  
40 hrs.  
X
X
X
X
Check Tire Conditions  
Inspect Saftey Devices / Decals  
Check Wheel Bearings  
Check Battery  
X
X
X
Inspect Brake Lining  
Visually Check for Oil Leaks  
X
CLEANINGTHE PUMP AND DELIVERY SYSTEM  
DANGER  
Cleaning the pump is a very important operation as it determines  
how the machine will pump the next time it is used.  
At the end of every pour, or because of long delays during a  
pour, the pump and delivery system must be thoroughly cleaned  
by removing all concrete material.  
You will be required to put your hand in the concrete cylinders or  
near the shuttle tube.You are at EXTREME RISK of injury or  
AMPUTATION if the engine is running or if pressure is in the  
hydraulic system.  
1. Following the “Clearing Concrete Blockage” operating  
procedure on page 26, ensure that there is no blockage in  
the hose and line or in the shuttle tube (using the Shuttle  
Tube Inspection Procedure, page 26-27). If a blockage  
exists, clear it.  
Prior to performing any maintenance on the pump, stop the engine  
by turning off the ignition switch and remove the starter key.  
Place aDO NOT OPERATEtag over the switch and disconnect  
the battery.The pressure reading on the accumulator pressure  
gauge MUST read ZERO. ALWAYS relieve the accumulator circuit  
to zero pressure prior to performing any maintenance on the  
pump.  
2. Pump concrete until the opening of the concrete cylinder  
intake in the hopper is visible.  
3. Stop the pump.  
4. Carefully disconnect the first hose joint at the shuttle tube  
discharge elbow.  
PAGE 44 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
5. Add water to the hopper. Pump and flush clean the entire  
hopper, shuttle tube and discharge elbow with water.  
HYDRAULIC OIL SYSTEM MAINTENANCE  
1.  
When changing the hydraulic oil or topping off the reservoir,  
use only the following type. (Reservoir capacity 58 gal.)  
6. Scoop out 12 inches of concrete from the inboard end of the  
delivery hose. “Cork screw” a 6" x 6" x 8" sponge into the end  
of the first hose section. Reconnect the hose to the discharge  
elbow.  
Hydraulic oil: Shell Oil Tellius 68 or  
Mobil DFE 26  
Texaco Rand HDC  
7. Fill hopper with water.Pump until sponge and clean water  
come out the discharge end of the hose and line system.  
The Mayco pump is equipped with an in-tank return hydraulic  
filter with a 10 micron cleanable filter. The element has been  
designed to remove all particles large enough to cause wear  
and job break down. Under normal conditions, we recommend  
replacement every 6 month.  
8. When the Model ST-45 has been used to pump small  
aggregate concrete (pea rock,  
½" minus) or mixes with high  
fines content (60% or more sand) there will be a tendency  
for hardened concrete to build up on the inside surface of  
the shuttle tube.Therefore, at the end of every such pour,  
after the pump and system have been cleaned and the  
engine shut off, remove the shuttle tube inspection plate  
(follow the Shuttle Tube Inspection Procedure,  
page 26-27) and remove all remaining concrete.  
WARNING  
DO NOT mix oil brands!This may impair  
quality.  
9. When the Model ST-45 has been used to pump large  
aggregate concrete (  
step 8 once per week.  
¾" to 1  
½") follow the instructions in  
The most important factor to keep in mind is the effect of cold  
weather on the hydraulic oil. The viscosity (thickness) of the  
hydraulic oil will be much heavier.  
WARNING  
NEVER use muriatic acid to clean the pump.  
Acid will dissolve the chrome finish on  
material cylinder bore and main hydraulic  
cylinder rods.  
Always run machine until oil temperature reaches a minimum of  
50°F. before pumping. Damage to the main piston pump will  
occur if the machine is cycled too fast before the oil temperature  
reaches the minimum of 50°F.Cycle the machine at 6-8 strokes  
per minute at approximately 1/3 throttle.  
Use only a 2½" diameter clean-out  
In areas where the weather normally remains under 50°F., use  
Shell OilTellus – 46, or the equivalent.The above steps must be  
followed or severe damage to the main axial piston pump will be  
the end result.  
hook when back-pumping into redi-  
mix truck. Use a safety chain to secure  
the clean-out hook to some solid part  
of the mixer truck to prevent hook from  
jumping off of the drum. Run the pump  
at 6 strokes per minute maximum  
speed.  
2.  
Lubrication: Grease daily/Hour  
Main hydraulic cylinders  
Remix bearings  
Axle crank  
- 2 Place  
- 2 Place  
- 1 Place  
- 2 Place  
- 3 Place  
ENGINE (Hatz Model 3M41 57HP Diesel)  
The ST-45 is equipped with a Model 3M41 57HP diesel engine.  
For information concerning the procedure in checking, removing,  
cleaning, etc.of the various engine parts or any other information  
on the engine not contained herein, refer to the engine  
manufacturer’s instruction manual.  
Suttle cylinders  
“S” tube outlet flange  
GreaseType:  
Lithium Based EP  
Texaco Multitak 20  
Lubriplate ED-2  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 45  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
BATTERY MAINTENANCE  
BRAKE SYSTEM  
The brake system should be periodically checked. Look for fluid  
leaks worn or cracked hoses. Check the reservoir for proper fluid  
levels.The Atwood surge brake should be checked for damage.  
Make sure that all links and pivots are kept lubricated.  
See Figure 16 for troubleshooting tips.  
Mishandling of the battery shortens the service life of the battery  
and adds to maintenance cost.When handling the battery do the  
following:  
z
Be careful not to let the battery electrolyte come in contact  
with your body or clothing.  
1. Keep all links and pivots lubricated to prevent rusting and  
ensure ease of operation. Using SAE 30 oil, lubricate inside  
the release handle and inside the actuator body.This can be  
reached from the underside of the actuator.  
z
Always wear eye protection and rubber gloves, since  
the battery contains sulfuric acid which burns skin and eats  
through clothing.  
z
z
z
Always check the battery terminals periodically to  
ensure that they are in good condition.  
Use wire brush or sand paper to clean the battery  
terminals.  
Lubricate the hitch ball with  
conventional automotive grease or a  
lubricant made for hitch balls.  
Always check battery for cracks or any other damage.  
If white pattern appears inside the battery or paste  
has accumulated at the bottom, replace the battery.  
2. Check for any leaks in the brake system. Periodic checks  
should be made on all hoses to guard against cuts and worn  
hoses which may cause failure (leaks, rupturing under  
pressure, and collapsing). Replace defective hoses.  
z
If the pump will not be in operation for a long period  
of time, store in cool dry place and check the battery  
charge level every month to maintain the performance  
of the battery.  
CAUTION  
CAUTION :  
DO NOT fill the master cylinder reservoir with  
used brake fluid. DO NOT fill the reservoir  
Wear safety glasses or face  
mask, protective clothes, and  
rubber gloves when working  
with battery.  
beyond  
fluid will damage paint.  
½" from top.DO NOT overfill;brake  
3. Check the brake fluid level in the master cylinder reservoir.  
Keep it filled to within  
½" from the top of the reservoir.  
4. At the beginning of each year, inspect the brakes for excessive  
wear, replace the linings if necessary.  
z
Check the battery regularly and make sure that each  
electrolyte level is to the bottom of the vent well  
(Figure 43). If necessary add only distilled water in a  
well-ventilated area.  
Wheel bearings and seals should be  
inspected and packed at this time.  
Figure 43. Battery Electrolyte Levels  
PAGE 46 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
ST45 PRESSURE SETTING SEQUENCE  
6.  
On the electrical control panel, turn the pump control  
switch (Figure 22) and the test switch (Figure 31) to the  
ON” position. Using an allen wrench, adjust the main relief  
valve (Figure 45) to 3500 PSI.The reading can be taken  
from the pumping pressure gauge (Figure 46).  
To set maximum pump pressure:  
1.  
With the engine turned “OFF”, loosen the ¼” hydraulic  
hose attached to the compensator valve located on  
the top of the Main Delta Q Pump.  
7.  
Hold the main relief valve adjusting bolt with a wrench and  
tighten the jam nut. Using the test switch, double check the  
pressure reading to make sure the setting has not changed.  
Figure 44. CompensatorValve  
2.  
3.  
Loosen the jam nut located on the end of the compensator  
Figure 46. Pumping Pressure Gauge  
valve (Figure 44).  
8.  
9.  
Turn the engine off and loosen the hose from the  
compensator valve. Loosen the jam nut and turn the  
compensator adjustment nut (Figure 44) counter-  
Turn the compensator adjustment nut (Figure 44)  
clockwise until tight. Tighten the ¼” hose leading to the  
compensator.  
clockwise  
½
turn. Tighten the  
¼” hydraulic hose.  
4.  
5.  
Start the engine and loosen the jam nut located on the  
maximum relief valve cartridge (Figure 45).  
Start engine and run at maximum RPM with volume control  
at maximum volume (fully counter-clockwise).Turn the  
pressure test switch (Figure 31) to the “ON” position.  
The pumping pressure gauge should now read 3300 PSI.  
It may be necessary to repeat the above steps to achieve  
the proper pressure settings. After the adjustment, make  
sure the compensator valve jam nut is locked tight.  
Run the engine at maximum RPM (2550) and turn the  
volume control knob counter-clockwise to maximum  
volume position (Figure 45).  
MAXIMUM RELIEF  
VALVE CARTRIDGE  
JAM NUT  
MAIN  
RELIEF VALVE  
VOLUME  
CONTROL  
Figure 45. Hydraulic Drive Pump Manifold  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 47  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
ST45 ACCUMULATOR CIRCUIT  
CYLINDER LUBRICATION BOX  
DANGER  
CAUTION  
Before checking lubrication level, stop the  
engine and remove the engine starter key.  
Improper accumulator charging can result in an explosion  
causing serious injury or death! NEVER use oxygen or  
compressed air to charge the accumulator! Only qualified  
personal should perform this procedure. Use only dry  
nitrogen to charge the accumulator. Contact your Mayco  
service department or your local Hydac representative for  
proper charging procedure.  
1. The lubrication level should be checked everyday prior to  
pumping and maintained at a height of 5 inches or about ½  
the concrete cylinder height. We reccomend a using a  
soluble type oil (water & oil mixture)  
Important notice! During freezing  
temperatures, completely drain the  
Lubrication Box and cover the hopper  
after each use. Frozen liquid will  
restrict the piston travel and cause  
damage to the pump.  
The accumulator circuit has two functions in the hydraulic system.  
The accumulator circuit furnishes the hydraulic pressure  
to cycle the shuttle tube.  
The accumulator circuit also furnishes the pilot pressure  
necessary to activate the hydraulic system.  
2. As the rubber piston cups naturally wear, fine cement  
particles will accumulate in the box.Once the concrete paste  
reaches a height of about ½ inch from the bottom of the box,  
drain and clean the lubrication box.  
The accumulator circuit is equipped with  
a bladder type accumulator (Figure 48)  
charged with 1100 PSI of dry nitrogen.  
The accumulator stores one gallon of  
hydraulic oil, which is, under 1750 PSI  
of pressure.  
CLEANINGTHE LUBRICATION BOX  
1. Remove the top cover and the drain plug (Figure 47) located  
at the bottom of the box and fully drain the inside of the box.  
2. Once the box is drained, start the engine and stroke the  
Figure 48. Accumulator  
cylinder (keep hands out of box) ten to fifteen times.  
3. While stroking, spray water inside of the box to thoroughly  
clean out all contamination (Figure 47).  
When the pump cycles, a part of the stored oil is released to the  
shuttle cylinder.This pressure release assures the shuttle tube  
has enough force to shear the cylinder of concrete passing from  
the concrete cylinder to the concrete delivery line during the  
cycle phase.  
4. When the box is clean replace drain plug, add new  
lubrication and install the top cover.  
CHECKING ACCUMULATOR BLADDER PRESSURE  
The normal accumulator charge pressure should be  
approximately 1100 PSI.To check the accumulator pressure:  
1. Start the engine and stroke the pump. The accumulator  
pressure gauge (Figure 29) should read 1750 PSI.  
2. To determine the actual accumulator PSI, stop the engine  
and observe the pressure gauge. As the PSI reading slowly  
decreases, it will reach a point where there will be a sudden  
drop in the PSI.The PSI reading should be taken just prior to  
this sudden drop.If you do not read 1100 PSI, the accumulator  
may require charging or bladder replacement.  
Figure 47. Cleaning the Lubrication Box  
PAGE 48 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
SETTING PRESSURE INTHE ACCUMULATOR CIRCUIT  
4. Loosen the lock nut for the the accumulator circuit pilot  
relief valve cartridge (Figure 51), located at port G4.Using  
an allen wrench, turn the adjusting screw until pressure  
gauge reads 1950 PSI and tighten lock nut. Turn the engine  
off and on several times to make the pressure continues to  
read 1950 PSI.  
1. Attach a 3000 PSI test gauge (Mayco P/N 98016) to port  
G2 of the main manifold block (Figure 49).  
3000 PSI  
PRESSURE TEST GAUGE  
P/N: 98016  
PILOT RELIEF  
VALVE CARTRIDGE  
ADJUSTMENT  
SCREW  
LOCK NUT  
Figure 51. Pilot Relief Valve Cartridge Adjustment  
5. Turn the unloading valve cartridge adjusting screw  
counter-clockwise until the pressure reaches 1750 PSI  
on the accumulator pressure gauge (Figure 29).Start and  
stop the pump several times to make sure the accumulator  
circuit pressure is holding at 1750 PSI.  
Figure 49. Accumulator Circuit PressureTest Gauge  
2. Loosen the lock nut on the unloading valve cartridge  
(Figure 50) and using an allen wrench, turn the adjusting  
screw clockwise until it is completely closed.  
6. Tighten the lock nut on the unloading valve cartridge.Your  
accumulator circuit pressure should now be properly  
adjusted.  
ADJUSTMENT  
SCREW  
UNLOADING  
VALVE CARTRIDGE  
LOCK NUT  
Figure 50. UnloadingValve Cartridge Adjustment  
3. Turn the pump control switch (Figure 22) to the “ON”  
position and run engine at 2550 RPM.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 49  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
CHANGINGTHE CONCRETE CYLINDER PISTON CUPS  
6.  
Remove the three 3/8 – 16 x 3” bolts (Lubrication Pistons  
Assy, Item 20) from the piston.Remove the front faceplate  
(Lubrication Pistons Assy, Item 19).  
The Rubber piston cups will occasionally require replacement  
depending on the following factors.  
7.  
Install two the 3/8’ 16x3” bolts (Lubrication Pistons Assy,  
Item 20) back into the piston – do not tighten. Use the two  
bolts as leverage to remove the rubber piston cup  
(Lubrication Pistons Assy, Item 17) and rear components.  
The fluid level and cleanliness of the lubrication box.  
The size and type of aggregate.  
The type of concrete being pumped.  
It is time to replace the cups when increasingly large particles of  
sand and cement pass into the lubrication box. Do not allow the  
cups to become so worn that they begin to pass lubrication into  
the material cylinders. If the liquid level of the lubrication box  
becomes to low, the rubber cups will severely deform due to  
excessive heat. Whenever replacement is due, both cylinder  
cups should be replaced.  
8.  
9.  
Obtain two 3/8 16x7” full thread studs (these studs will be  
used to assist in assembly alignment) insert the two studs  
into the piston adapter P/N 16460. Coat the concrete  
cylinder with grease.  
The new “O” ring (Lubrication Pistons Assy, Item 12) must  
now be modified. Using a sharp knife cut four oil passage  
grooves into the ring. the grooves should be placed at a  
distance of 90o apart.The cut should be a v-shaped design,  
0.059” deep and 0.157wide at the top.  
WARNING  
10. Install the “O” Ring P/N 14407 around the oiler plate  
(Lubrication Pistons Assy, Item 13).Install the plate into the  
concrete cylinder utilizing the studs for alignment.  
11. Install the felt holder (Lubrication Pistons Assy, Item 14)  
over the oiler plate.Install felt ring (Lubrication Pistons Assy,  
Item 15) into felt holder. Install the bronze ring (Lubrication  
Pistons Assy, Item 16)  
ALWAYS relieve the accumulator circuit to ZERO pressure prior  
to performing any maintenance on the pump.  
CYLINDER CUP REPLACEMENT PROCEDURE  
Felt ring must be saturated with 30 wt.  
oil prior to installation.  
1.  
2.  
3.  
4.  
5.  
Remove the two hydraulic hoses (Hopper Assy., Item 34)  
connected to the remix motor.Plug the ports with fittings(not  
provided) to prevent hydraulic hose leakage.  
Remove the hopper discharge nipple (Hopper Interior  
Assembly, Item 21) and loosen sleeve seal. Inspect and  
replace if wear is excessive.  
12. Using silicon sealant place a small bead of sealant  
material on the front of the rubber piston cup and the rear of  
the face plate. Install over alignment studs and into concrete  
cylinders.  
Remove the two tie rod nuts (Hopper Attachment, Item 19)  
and the four eyebolt nuts (Hopper Attachment, Item 22)  
securing the hopper to the pump frame.  
13. Insert one 3/816x3bolt into the open bolt hole, remove  
the alignment studs one at a time and install the remaining  
3/8” 16x3” bolts.  
Using an approved lifting device, remove the hopper  
(Hopper Assy, Item 1) using extreme care not to damage  
the hopper seal (Hopper Assy, Item 2).  
Start the engine and turn on the pressure test switch (Figure  
31). Cycle pump in reverse until hydraulic system obtains  
maximum pressure, then turn pump and engine off.  
Before installing 3/8” bolt, coat the back  
of bolt heads with silicon sealant.  
Torque all three bolts equal at 55 ft.  
lbs. each.  
Remove ignition key and disconnect battery.  
Think safety! Check the hydraulic gauges (Figure 29) on  
panel and make sure accumulator pressure reads zero.  
One piston should be in the fully discharged position at the  
end of the concrete cylinder.  
PAGE 50 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
CHANGINGTHEWEAR PLATE AND RING  
Wear Plate Installation  
Due to the swinging motion of the Nun-plate and the abrasive  
nature of concrete, it is normal for the cutting ring to wear on the  
side that shears through the concrete inside the hopper. If the  
wear ring and wear plate do not fully seat against each other the  
concrete slurry will pump into the hopper.This condition can be  
easily observed by the sudden change of the level of concrete  
inside the hopper during each stroke.  
1.  
2.  
Install the two cylinder “O” rings (Hopper Interior Assy,  
Item 10).  
Using silicon sealant, coat the circumference of the concrete  
cylinders, the back of the wear plate and around the five  
bolt holes. Next, install the wear plate and the five bolts.  
The bolts must all be equally snugged and tightened to  
100 foot pounds each.  
Wear Plate and Ring Replacement Procedure  
Wear Ring installation  
1.  
2.  
3.  
4.  
5.  
Remove the two hydraulic hoses (Hopper Assy., Item 34)  
connected to the remix motor.Plug the ports with fittings(not  
provided) to prevent hydraulic hose leakage.  
1.  
Install the wear ring (Hopper Interior Assy, Item 13) into the  
nun plate.  
2.  
Install the steel insert ring (Hopper Interior Assy, Item A)  
inside of the rubber energizer ring (Hopper Interior Assy,  
Item 13B).  
Remove the hopper discharge nipple (Hopper Interior  
Assembly, Item 21) and loosen sleeve seal. Inspect and  
replace if wear is excessive.  
3.  
Install the energizer ring assembly into the nun-plate.  
Remove the two tie rod nuts (Hopper Attachment, Item 19)  
and the four eyebolt nuts (Hopper Attachment, Item 22)  
securing the hopper to the pump frame.  
After installing the above mentioned components the machine  
can be re-assembled by reversing steps 1 through 5 of theWear  
Plate and Ring Replacement Procedure.  
Using an approved lifting device, remove the hopper  
(Hopper Assy, Item 1) using extreme care not to damage  
the hopper seal (Hopper Assy, Item 2).  
Remove the four 1/21 ¼ “ bolts (Hopper Interior Assy, Item  
43) that hold the suttle tube to the nun-plate and remove  
shuttle tube (Hopper Interior Assy, Item 41).  
Using two small pry bars remove the rubber energizer ring  
(Hopper Interior Assy, Item 13B), steel insert ring (Hopper  
Interior Assy, Item A) and wear ring (Hopper Interior Assy,  
Item 13).  
The energizer ring and wear ring  
will normally have concrete  
contamination holding them in  
position. It will be required to chip  
some of the concrete loose to better  
expose the energizer ring.  
6.  
Clean out all concrete build up in and around the nun-  
plate area with a wire brush.  
7.  
Inspect the wear components for indications of wear.  
The wear plate (Hopper Interior Assy, Item 52) has two  
wear surfaces. If it becomes necessary to replace, the plate  
can be reversed to the opposite side to expose a new flat  
surface. To replace or reverse the plate, remove the five  
allen head counter sink bolts.Then remove the two cylinder  
“O” rings and clean the entire back surface.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 51  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MAINTENANCE (PUMP)  
WHEEL BEARINGS  
EXTENDED STORAGE INSTRUCTIONS  
After every 6 months of operation inspect the wheel bearings.  
Once a year, or when required, disassemble the wheel hubs  
remove the old grease and repack the bearings forcing grease  
between rollers, cone and cage with a good grade of high speed  
wheel bearing greases (never use grease heavier than 265  
A.S.T.M.penetrationNo.2.).  
The following preventative maintenance is recommended for  
extended periods of storage.  
1. Check brake system for proper fluid level in master cylinder  
and bleed all lines.  
2. Lubricate all links and pivots to prevent any rusting.  
3. Remove wheel and drum assemblies and spray a good anti-  
corrosion compound (CRC formula 5-56) under rubber boot  
on forward end of brake wheel cylinder.Avoid spraying drum  
and brake lining.  
1. Fill the wheel hub with grease to the inside diameter of the  
outer races and also fill the hub grease cap.  
2. Reassemble the hub and mount the wheel.Then tighten the  
adjusting nut, at the same time turn the wheel in both  
directions, until there is a slight bind to be sure all the bearing  
surfaces are in contact.  
4. Grease all bearings and reinstall wheel and drum  
assemblies.  
5. Make sure breakaway cable is fully released.  
3. Back off the adjusting nut 1/6 to 1/4 turn or to the nearest  
locking hole or sufficiently to allow the wheel to rotate freely  
within limits of .001” to .010” end play. Lock the nut at this  
position.  
6. After extended storage, refer to the Maintenance Steps listed  
above to insure that the trailer is ready for towing.  
4. Install the cotter pin and dust cap, and tighten all hardware.  
PAGE 52 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
NOTE PAGE  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 53  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HYDRAULIC HOSE CONNECTIONS  
Figure 53 is provided to show the hydraulic hose connections  
on the ST-45 for reference when performing inspections and  
maintenance on the pump.  
FRONT OF MACHINE  
M
N
REMIXER  
CONTROL  
MANIFOLD  
I
J
L
M
K
L
O
FRONT OF MACHINE  
HEAT EXCHANGER  
LUBRICATION  
PISTONS  
N
P
HYDRAULIC  
DRIVE PUMP  
O
J
I
K
P
FRONT OF MACHINE  
NOTES  
HOSES SHADED FOR  
VISUAL CLARITY.  
Figure 53. Hydrauilc Hose Connections  
PAGE 54 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HYDRAULIC HOSE CONNECTIONS  
Figure 53. Hydrauilc Hose Connections (Continued)  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 55  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HYDRAULIC HOSE CONNECTIONS  
Figure 53. Hydrauilc Hose Connections (Continued)  
PAGE 56 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 — MANIFOLD PORT LOCATIONS  
Figure 54 is provided to show the locations and names for  
the two manifold block ports on the ST-45 for reference when  
peforming maintenance on the pump.  
Figure 54. Manifold Ports  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 57  
Download from Www.Somanuals.com. All Manuals Search And Download.  
APPENDIX — ST-45 PUMP CONCRETE MIX INFORMATION  
The following information has been extracted from actual testing laboratory reports.The purpose of this printing is only to help create  
a better understanding of the importance of uniform gradation and proportioning of materials which affect pumpability of concrete  
mixes.These weights and proportions illustrate that when the sieve analysis is ideal, the sand/rock ratio can be adjusted (65% sand  
35% rock) and pumpability should be excellent.  
EXAMPLE #1 (A CaliforniaTest Lab.Report)  
JOB:Building Foundations (Water Project)  
Sacks per cu./yd.  
6.5 designed for 2,500 lbs. in 28 days  
Gallons per sack  
7.1  
1.3  
Washed Sand-#200 wash  
Organic matter-OK  
Specific gravity (SSD)  
Sand-2.58;Pea Gravel-2.60  
Sieve analysis-percent passing  
Material  
1.5” 1”  
3/4”  
3/8”  
100  
100  
100  
#4  
#8  
#16  
#30  
#50  
#100  
4.0  
#200  
1.1  
W.C.Sand  
Pea Gravel  
% Comb.  
99.7  
3.0  
66  
79.1  
60.4  
36.5  
14.3  
51  
39  
23  
9
3
1.0  
DESIGN FOR ONEYARD OF CONCRETE (SATURATED & SURFACE DRY):  
Absolute volume of aggregate in one cu. yard:  
Specific gravity of aggregates in one cu. yard:  
Weight of aggregates in one cu. yard batch: 2850 lbs.  
17.78 cu. ft.  
2.58  
%
BATCH  
1800  
1000  
1
SPEC.GRAVITY  
ABS.VOL.  
11.56  
W.C.Sand  
PEA GRAVEL  
WATER 46 gal.  
CEMENT 6.5 sk.  
TOTAL  
65  
35  
2.58  
2.60  
6.22  
611  
27.00  
ADMIXTURE:  
SLUMP  
None  
4”  
REMARKS  
NOTE:  
This mix designed for pumping  
Due to the availability of well-graded sand as shown in the above sieve analysis,  
this mix pumped very successfully.  
PAGE 58 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
APPENDIX — ST-45 PUMP CONCRETE MIX INFORMATION  
A.S.T.M. STANDARD SPECIFICATION FOR GRADING AGGREGATE  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 59  
Download from Www.Somanuals.com. All Manuals Search And Download.  
APPENDIX — ST-45 PUMP SLUMPTEST PROCEDURE  
1. To obtain a representative sample (concrete), take sev-  
Figure 41-B. Slump  
Test (2/3 Full)  
eralsamplesatthreeormoreregularintervalsthroughout  
thedischargeofthemixerortruck.DONOTtakesamples  
at the beginning or end of the discharge.  
2. Dampentheinsideoftheconeandplaceitonasmooth,  
moist, nonabsorbent, level surface large enough to ac-  
commodate both the slumped concrete and the slump  
cone. Stand on the “foot pieces” throughout the test  
procedure to hold the cone firmly in place.  
2/3 FULL  
3. Fill the cone 1/3 full by volume (Figure 41-A) and rod 25  
timeswitha1/2diax24lg.bullet-pointedsteelrod.(This  
is a specific requirement which will produce non-stan-  
dard results unless followed exactly.) Distribute rodding  
evenly over the entire cross section of the sample.  
Figure 41-C. SlumpTest  
(Full-Overflow)  
4. Fill cone another 1/3 (Figure 41-B) which will make the  
cone 2/3 full by volume. Rod this second layer 25 times  
withtherodpenetratinginto,butnotthrough,thefirstlayer.  
Distributeroddingevenlyovertheentirecrosssectionof  
thelayer.  
FULL  
(OVERFLOW)  
5. Fill cone to overflowing (Figure 41-C). Rod this layer 25  
timeswithrodpenetratingintobutnotthrough,thesecond  
layer. Distribute rodding evenly over the entire cross  
sectionofthislayer.  
Figure 41-D. SlumpTest  
(Removing Excess Concrete)  
6. Removetheexcessconcrete(Figure41-D)fromthetop  
of the cone, using the tamping rod as a screed.  
7. Lift the cone vertically (Figure 41-E) with a slow even  
motion.DONOTjartheconcreteortilttheconeduringthis  
process.(Invertthewithdrawncone,andplaceitnextto,  
but not touching the slumped concrete.  
Figure 41-E. SlumpTest  
(Cone Invert)  
8. Lay a straight edge (Figure 41-F) across the top of the  
slumped cone. Measure the amount of slump in inches  
from the bottom of the straight edge to the top of the  
slumpedconcreteatapointovertheoriginalcenterofthe  
base .The slump operation must be complete in a maxi  
BULLET POINTED  
STEEL ROD  
Figure 41-F. SlumpTest  
(Measurement)  
1/3 FULL  
1/2 DIAMETER  
24 INCHES LONG  
FOOT  
PIECE  
Figure 41-A. SlumpTest (1/3 Full)  
PAGE 60 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TROUBLESHOOTING (ENGINE)  
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a  
breakdown, please take a remedial action following the diagnosis based on the EngineTroubleshooting (Table 9) information  
shown below and on the proceeding page. If the problem cannot be remedied, please leave the unit just as it is and consult  
our company's business office or service plant.  
TABLE 9. ENGINE TROUBLESHOOTING  
SYMPTOM  
POSSIBLE PROBLEM  
Speed control lever is in "STOP" position?  
No fuel reaching injection pump?  
Defective fuel pump?  
SOLUTION  
Set speed control lever to "START" position.  
Add fuel. Check entire fuel system.  
Replace fuel pump.  
Fuel filter clogged?  
Replace fuel filter and clean tank.  
Replace or repair fuel line.  
Faulty fuel supply line?  
Engine will not start or start is  
delayed, although engine can  
be turned over.  
Check piston, cylinder and valves. Adjust or  
repair per engine repair manual.  
Compression too low?  
Repair or replace injector in accordance with  
engine repair manual.  
Fuel injector not working correctly?  
Oil pressure too low?  
Check engine oil pressure.  
Comply with cold starting instructions and  
proper oil viscosity.  
Low starting temperature limit exceeded  
Check whether clear (not turbid) fuel emerges  
from the fuel line (detach from injection  
pump). If the fuel is turbid or separated, warm  
up the engine or drain the complete fuel  
supply system. Refuel with winter grade diesel  
fuel.  
Fuel separates has inadequate resistance to  
low temperatures?  
At low temperatures engine will  
not start.  
Refill engine crankcase with correct type of oil  
for winter environment.  
Engine oil too thick?  
Throttle lever in STOP position?  
Fuel filter blocked?  
Reposition throttle lever to RUN position.  
Replace fuel filter.  
Engine fires but stops soon as  
starter is switched off.  
Fuel supply blocked?  
Fuel tank empty?  
Check the entire fuel system.  
Add fuel.  
Engine stops by itself during  
normal operation.  
Fuel filter blocked?  
Replace fuel filter.  
Fuel tank empty?  
Replace fuel filter.  
Fuel filter clogged?  
Replace fuel filter.  
Low engine power, output and  
speed.  
Fuel tank venting is inadequate?  
Ensure that tank is adequately vented.  
See engine manual for corrective action.  
Speed control lever does not remain in  
selected position?  
Engine oil level too full?  
Air filter blocked?  
Correct engine oil level?  
Clean or replace air filter.  
Adjust valves per engine specification.  
See engine manual.  
Low engine power output and  
low speed, black exhaust  
smoke.  
Incorrect valve clearances?  
Malfunction at injector?  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 61  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TROUBLESHOOTING (HYDRAULIC SYSTEM)  
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a  
breakdown, please take a remedial action following the diagnosis based on the Hydraulic System Troubleshooting  
(Table 10) information shown below and on the proceeding page. If the problem cannot be remedied, please leave the unit  
just as it is and consult our company's business office or service plant.  
TABLE 10. HYDRAULIC SYSTEM TROUBLESHOOTING  
SYMPTOM  
POSSIBLE PROBLEM  
SOLUTION  
Check TB1 terminal #17. If this terminal is energized when the  
pump is turned on, the pump will not cycle because the  
compensator is dumping controll pressure to the accumulator tank.  
Check K-3 relay and replace if necessary.  
Delta "Q" compensator not de-energized  
when pump is energized?  
Volume control not turned open?  
Hydraulic oil level low?  
Turm volume control valve counter-clockwise to open.  
Fill resevouir to proper level.  
No hydraulic oil flow from axial piston  
pump.  
Restricted suction screen?  
Main pressure relief valve open  
Clean suction screen.  
Remove cartridge. Clean and reset. Replace cartridge if  
ncessisary.  
This emergency cycle switch, located in the control box, can be  
used to determine which switch is faulty. Determine malfunctioning  
proximity switch and replace.  
Proximity switch is not sending a signal?  
Pilot cycle valve malfunction?  
Turn on pump switch. Check TB1 terminal #35 and #36 to  
determine if current is flowing to valve. Check detents in valve for  
proper operation.  
Drive cylinders will not cycle  
K-4 relay faulty?  
Check the proximity switch enclosure.  
Main cycle valve(manifold) faulty?  
Check spool or centering springs. Replace or repair as necessary.  
Re-charge accumulator bladder with nitrogen to 1100 PSI.  
Adjust unloading valve until 1750 PSI is reached.  
Accumulator pressure drops to zero  
on every cycle  
Low nitrogen charge in accumulator  
bladder?  
Accumulator pressure is below 1750  
PSI.  
Unloading valve setting too low?  
Accumulator pressure is not  
discharging when switch is turned off  
Cartridge at port 4-D on manifold block  
is not working?  
Check solinoid and cartridge. Replace if necessary  
PAGE 62 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TROUBLESHOOTING (ELECTRICAL SYSTEM)  
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a  
breakdown, please take a remedial action following the diagnosis based on the Electrical System Troubleshooting  
(Table 11) information shown below and on the proceeding page. If the problem cannot be remedied, please leave the unit  
just as it is and consult our company's business office or service plant.  
TABLE 11. ELECTRICAL SYSTEM TROUBLESHOOTING  
SYMPTOM  
POSSIBLE PROBLEM  
SOLUTION  
If the hydraulic system is in a maximum pressure condition, pull  
the toggle on the emergency cycle switch (located inside the  
control box) towards you. If the pump cycles, replace the proximity  
switch at the lubrication box. If the pump cycles when you push  
the toggle down, replace the proximity switch on the towing end of  
the pump.  
After completion of a pumping stroke,  
pumping pressure gauge indicates  
high pressure and cycle stops.  
Proximity switch is not emitting a radio  
frequency?  
Use a hot jumper wire. Connect (jumper wire) to terminals #35  
and #36 on terminal block #1. When contact is made between  
these two terminals and the pump cycles. This would indicate that  
you have a faulty K-4 relay.  
Emergency cycle switch does not  
cycle pump  
Faulty K-4 relay?  
Check fuse box in control panel. Replace blown fuses.  
Check fuse link below engine solenoid, next to batter.  
Starter switch is activated and pump  
does not start  
Faulty fuses?  
Hatz engine will not continue to run  
after key is released  
Check D1 diode in control box. Replace if needed with 6 amp  
diode P/N EGG5815 or equivalent.  
D-1 diode has failed?  
No power to TB-5, conductor #3?  
Hatz engine will not start  
Check and replace K1 relay if necessary  
Check and replace K-2 relay if necessary  
No power to magnet valve start/stop?  
Engine runs, but no current travels to  
circuits #32-47  
Faulty K-2 relay?  
K-6 relay not completing the circuit?  
Open circuit at TB1-24?  
When pump is turned on, engine  
RPM's will not increase  
Check and replace K-6 relay if necessary  
The pump will not reverse when  
operated by remote control  
K-5 relay failure?  
Check and replace K-5 relay if necessary  
Check and replace sending unit if necessary  
Engine oil pressure light will not  
de-activate  
Oil pressure sending unit failure?  
Faulty D-2 diode?  
Replace with diode 1U404-C  
Battery charge light wont de-activate  
Alternator not charging battery?  
Check and repair/replace alternator unit.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 63  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TROUBLESHOOTING (BRAKE SYSTEM)  
Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a  
breakdown, please take a remedial action following the diagnosis based on the Brake System Troubleshooting  
(Table 11) information shown below and on the proceeding page. If the problem cannot be remedied, please leave the unit  
just as it is and consult our company's business office or service plant.  
TABLE 12. BRAKE SYSTEM TROUBLESHOOTING  
SYMPTOM  
POSSIBLE PROBLEM  
SOLUTION  
Overheated wheel bearing?  
Replace wheel bearing and pack with grease.  
Low brake fluid?  
Fill and bleed brake system.  
Brakes squeak, chatter or chuck.  
Siezed acutator master cylinder?  
Brake shoe noise?  
Replace/Rebuild master cylinder.  
Inspect drums. Adjust shoes or replace if necessary.  
Check and replace wheel cylinder and bleed brake system.  
Fill with dot approved brake fluid and bleed brake system.  
Replace complete actuator unit.  
Replace brake line.  
Leaking wheel cylinder?  
Low brake fluid level?  
Brake actuator frame damage?  
Brake line being pinched?  
Seized actuator?  
Brakes overheah, fail to operate, pull  
to the side, or function poorly  
Replace or rebuild actuator.  
Broken return spring?  
Brakes improperly adjusted?  
Replace spring.  
Check adjustment.  
Break-away cable might be pulled. Determine cause and correct.  
Pry up on cable until indicator bead touches or rests against cable  
spring stop. This will fully release the frame brakes and prevent  
drag.  
Break-away cable system  
partially activated?  
PAGE 64 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
NOTE PAGE  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 65  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — EXPLANATION OF CODE IN REMARKS COLUMN  
How to read the marks and remarks used in this parts  
book.  
Items Found In the “Remarks” Column  
Serial Numbers-Where indicated, this indicates a serial number  
range (inclusive) where a particular part is used.  
Model Number-Where indicated, this shows that the  
corresponding part is utilized only with this specific model number  
or model number variant.  
Items Found In theItems NumberColumn  
All parts with same symbol in the number column, , #, +, %,  
*
or <, belong to the same assembly or kit  
If more than one of the same  
reference number is listed, the last  
one listed indicates newest (or  
latest) part available.  
The contents of this catalog are  
subject to change without notice.  
PAGE 66 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 — SUGGESTED SPARE PARTS  
ST-45 STRUCTURAL CONCRETE PUMP  
ST-45 STRUCTURAL CONCRETE PUMP  
3 Units  
1 Units  
Qty.  
P/N  
Description  
Qty.  
P/N  
Description  
1 .......... EM16459 .............. PIN  
1 .......... EM16462 .............. FELT HOLDER  
4 .......... EM98050 .............. PISTON CUP, ORANGE  
4 .......... EM16493 .............. FELT RING  
2 .......... EM18801 .............. CONCRETE CYLINDER  
2 .......... EM16462 .............. FELT HOLDER  
6 .......... EM98050 .............. PISTON CUP, ORANGE  
8 .......... EM16493 .............. FELT RING  
1 .......... EM98033 .............. OIL PLATE  
2 .......... EM14408 .............. BRONZE RING  
2 .......... EM16145 .............. BUSHING, SWING AXLE (BRONZE )  
1 .......... EM98021 .............. WEAR RING  
2 .......... EM16816-1 ........... ENERGIZER RING  
1 .......... EM16816-2 ........... INSERT RING  
2 .......... EM98065 .............. SLEEVE SEAL  
1 .......... EM98022 .............. WEAR PLATE  
2 .......... EM97024 .............. SWITCH, PROXIMITY  
1 .......... EM50417 .............. CUP  
2 .......... EN98033 .............. OIL PLATE  
2 .......... EM14408 .............. BRONZE RING  
4 .......... EM16145 .............. BUSHING, SWING AXLE (BRONZE )  
3 .......... EM98021 .............. WEAR RING  
4 .......... EM16816-1 ........... ENERGIZER RING  
2 .......... EM16816-2 ........... INSERT RING  
4 .......... EM98065 .............. SLEEVE SEAL  
2 .......... EM98022 .............. WEAR PLATE  
4 .......... EM97024 .............. SWITCH, PROXIMITY  
3 .......... EM50417 .............. CUP  
1 .......... EM20709-1 ........... SOLENOID  
2 .......... EM97050 .............. RELAY  
1 .......... EM97048 .............. RELAY  
1 .......... EM97036 .............. SWITCH, PUMP CONTROL  
1 .......... EM97045 .............. SWITCH, OPERATION PUMP/ENG  
1 .......... EM98065 .............. RUBBER RING  
2 .......... EM20709-1 ........... SOLENOID  
4 .......... EM97050 .............. RELAY  
2 .......... EM97048 .............. RELAY  
2 .......... EM97021 .............. SOLENOID  
2 .......... EM97036 .............. SWITCH, PUMP CONTROL  
2 .......... EM97045 .............. SWITCH, OPERATION PUMP/ENG  
1 .......... EM98065 .............. RUBBER RING  
Part numbers on this Suggested  
Spare Parts List may supercede  
or replace the P/N shown in the  
text pages of this book.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 67  
Download from Www.Somanuals.com. All Manuals Search And Download.  
APPENDIX — ST-45 PUMP RECOMMENDED SHOTCRETE SYSTEM  
RECOMMENDED SHOTCRETE SYSTEM  
10  
AIR COMPRESSOR  
(125 TO 250 CFM)  
1/2 STANDARD  
AIR HOSE  
1
3/4 STANDARD  
AIR HOSE  
2
10  
4
3
6
3
6
9
3
11  
OR  
8
7
13  
15 14  
Figure 39. Shotcrete System  
PAGE 68 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
APPENDIX — ST-45 PUMP RECOMMENDED SHOTCRETE SYSTEM  
RECOMMENDED SHOTCRETE SYSTEM  
NO.  
1
PART NO.  
EM28904  
PART NAME  
COUPLING, 3” H-D “CF”  
QTY. REMARKS  
2
EM23946  
EM28903  
EM28005DD  
EM28061  
EM24849  
EM28001DD  
EM23815D  
EM28902  
EM23101  
TBD  
ELBOW, 3"x90°  
3
COUPLING, 2.5” H-D w/GASKET & PIN  
REDUCER, 3”x2.5”x36” H-D ENDS  
PIPE, 2.5”x120w x 10’ H-D  
HOSE, 2.5”x2”x36” H-D  
4
5
6
7
REDUCER, 2.5”x2”x36” H-D  
REDUCER, 2.5”x2” w/AIRVIBRATOR  
COUPLING, 2” H-D w/GASKET & PIN  
AIR VIBRATOR ASSY.  
8
9
10  
11  
12  
13  
14  
15  
2”x2” ELBOW  
EM24841  
EM23808D  
EM23806  
EM23807  
HOSE, 2”x25’ H-D w/ENDS  
NOZZLE ASSEMBLY, 2” H-D  
NOZZLE TIP, RUBBER 1-3/8”  
NOZZLE TIP, RUBBER 1.25”  
General recommendations  
If the site will permit, use steel pipe from the pump to  
the pool perimeter. It will reduce line pressures  
which is highly recommended.  
The vibrator on the reducer by the pool improves  
pumpability.  
Turn both air vibrators off whenever the pump is  
stopped to prevent separation of mix.  
The air vibrators are low consumption (4.2 scfm).  
Leave the air on at the nozzle when the pump is  
stopped to prevent clogging of air the hoses in the  
air insert.  
Use item #11 (steel elbow) at the edge of the pool to  
prevent collapse of the rubber hose, which can  
cause blockage.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 69  
Download from Www.Somanuals.com. All Manuals Search And Download.  
APPENDIX — ST-45 PUMP RECOMMENDED SHOTCRETE ACCESSORIES  
RECOMMENDED SHOTCRETE ACCESSORIES  
Figure 40. Shotcrete System Accessories  
Use a 1-3/8" rubber nozzle tip for a wide spray pattern. Use a 1-1/4" rubber nozzle tip for a narrow  
spray pattern.DO NOT INSTALLTHE NOZZLE ATTHE END OFTHE HOSE UNTILTHE FIRST  
MATERIAL HAS PASSEDTHROUGHTHE ENTIRE HOSE LENGTH.  
Disassemble and clean the nozzle assembly thoroughly after each job.Grease all threads before  
re-assembly.DO NOT close the air valve when pumping is stopped as a continued air flow keeps  
the air passages clean.  
PAGE 70 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
APPENDIX — ST-45 PUMP RECOMMENDED SHOTCRETE ACCESSORIES  
RECOMMENDED SHOTCRETE ACCESSORIES  
NO.  
1
2
3
4
5
6
7
8
PART NO.  
EM26107  
EM23101  
EM132  
EM23407  
EM23408  
EM23411  
EM912073  
EM23409  
EM923346  
EM406  
EM23818  
EM24841  
EM23845  
EM23802  
EM23803  
EM20816  
EM23804  
EM23805  
EM23806  
EM23807  
EM911076  
PART NAME  
QTY.  
REMARKS  
HOPPER SCREEN .......................1............. W/AIR VIBRATOR MOUNTING  
AIR VIBRATOR  
BOLT, 1/2-13X2  
AIR HOSE  
BUSHING  
VALVE  
NIPPLE  
COUPLING  
WASHER, 1/2 LOCK  
NUT, HEX 1/2-13  
2"X25' GROOVED HOSE  
2"X25' RAISED HOSE  
2"X50' GROOVED HOSE  
VIC ADAPTER / EM23802D H.D  
GUN BODY  
“O” RING  
AIR INSERT  
NOZZLE CLAMP  
NOZZLE TIP, 1-3/8", SHORT  
NOZZLE TIP, 1-1/4", LONG  
STREET ELBOW  
1
2
1
1
1
2
1
2
2
9
10  
11  
12  
*
1
1
1
1
1
1
1
1
13  
*
14  
*
15  
*
16  
*
17  
*
18  
*
19  
*
20  
AIR HOSE..................................................... NOT SUPPLIED BY MAYCO  
NOZZLE ASSEMBLY ................... 1 ............. INCLUDES ITEMS W/  
21  
EM23808  
*
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 71  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — DECAL PLACEMENT  
DECAL PLACEMENT  
PAGE 72 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — DECAL PLACEMENT  
DECAL PLACEMENT  
NO.  
1
2
PART NO.  
511709  
EM97082  
34536  
PART NAME  
QTY.  
1
2
REMARKS  
DECAL, 800-30-MAYCO  
DECAL, ST-45  
DECAL, OWNERS MANUAL  
3
1
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
EM97070  
EM97070  
EM93000  
EM98022  
EM696  
EM97072  
TBD  
DECAL, ACCUMULATOR PRESSURE  
DECAL, PUMPING PRESSURE DECAL  
DECAL, CAUTION - GREASE 2 HOURS  
DECAL, WARNING - CHECK MANUAL  
DECAL, CAUTION - TOWING DECAL  
DECAL, CAUTION - OP. INSTRUCTIONS  
DECAL, HOPPER REXMIXER  
DECAL, HYDRAULIC OIL  
DECAL, CAUTION - MINIMUM OIL LEVEL  
DECAL, MAINTENANCE  
DECAL, CAUTION - REFER TO MANUAL  
DECAL, WARNING - ACCUM. SAFETY  
DECAL, REMOTE OUTLET  
1
1
4
1
1
2
1
1
1
1
1
1
1
1
1
2
EM985  
EM97071  
EM97084  
EM955  
EM97083  
TBD  
EM965  
TBD  
DECAL,VOLUME CONTROL  
DECAL, SHUTTLE TUBE DANGER  
DECAL, MAYCO  
EM1023  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 73  
Download from Www.Somanuals.com. All Manuals Search And Download.  
AXLE ASSY.  
AXLE ASSY.  
ST-45 PUMP — AXLE ASSY.  
PAGE 74 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — AXLE ASSY.  
AXLE ASSY.  
NO.  
1
2
3
4
5
6
7
8
PART NO.  
PART NAME  
QTY.  
1
2
2
4
8
8
4
2
4
4
2
2
2
2
10  
10  
10  
2
REMARKS  
EM25611  
EM16608  
EM16607  
EM16605  
EM923347  
EM16612  
EM16609  
EM166081  
EM966259  
EM16612  
EM16611  
EM16612  
EM16610  
EM166141  
EM492451  
0166A  
AXLE  
LEAF SPRING  
SADDLE, SPRING  
U BOLT WITH NUTS AND WASHERS  
9/16LOCKWASHER  
9/16” LOCK NUT  
LINK SHACKLE L1A  
BUSHING, PLASTIC  
SHACKLE BOLT  
LOCK NUT  
BOLT  
LOCK NUT  
DRUM, BRAKE  
9
10  
11  
12  
13  
14  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
BRAKE ASSY.  
BOLT, 3/8”- 24 X 1 HEX HEAD  
3/8LOCKWASHER  
NUT 3/8”- 24  
15 INCH TIRE AND WHEEL  
COTTER PIN  
LUG NUT, CHROME  
CAP, 15” CHROME  
FENDER RIGHT-SIDE  
FENDER LEFT-SIDE  
BOLT, HHC 1/2- 13 X 3/4  
WASHER LOCK 1/2"  
EM492574  
EM26615  
EM924006  
EM26519  
EM26520  
EM511418  
EM513087  
981635  
2
12  
2
1
1
8
8
6109180  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 75  
Download from Www.Somanuals.com. All Manuals Search And Download.  
SUSPENSION FRENOS ASSY.  
BREAKLINE ASSY.  
ST-45 PUMP — BRAKELINE ASSY.  
PAGE 76 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — BRAKELINE ASSY.  
BREAKLINE ASSY.  
NO.  
1
2
3
4
5
6
PART NO.  
TBD  
TBD  
EM16602  
TBD  
EM166021  
EM16116  
PART NAME  
QTY.  
REMARKS  
NUT  
2
2
1
1
1
1
LOCK WASHER  
SURGE BRAKE ACTUATOR  
BOLT  
ACTUATOR COVER  
BRAKE LINE KIT  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 77  
Download from Www.Somanuals.com. All Manuals Search And Download.  
HOPPER ASSY.  
HOPPER ASSY.  
ST-45 PUMP — HOPPER ASSY.  
PAGE 78 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HOPPER ASSY.  
HOPPER ASSY.  
NO.  
1
2
3
4
5
6
7
8
PART NO.  
EM25174  
EM16184  
EM25863  
EM23305  
EM963610  
0166A  
EM25301  
EM963610  
0166A  
EM916001  
EM18137  
EM18138  
EM181361  
EM621  
EM18135  
6109180  
EM492397  
EM916001  
EM50141  
EM501411  
EM25425  
EM750  
PART NAME  
QTY.  
1
1
1
1
4
4
1
4
4
1
4
16  
4
4
2
8
8
1
1
1
1
1
1
2
2
2
1
1
1
4
4
4
1
REMARKS  
HOPPER ASSY.  
HOPPER SEAL 3/8” X 1/2  
REMIXER, SHAFT  
SHAFT, ADAPTOR  
CAPSCREW  
LOCK WASHER 3/8”  
SHAFT, DRIVE END  
CAPSCREW  
LOCK WASHER 3/8”  
GREASE FITTING  
SHAFT GASKET  
SPACER  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
22  
23  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
SPACER PLATE  
1/2WILLIAMS WASHER  
BEARING FLANGE  
LOCK WASHER 1/2”  
BOLT, HEX 1/2”- 13 X 2 1/2”  
GREASE FITTING  
MOUNT, REMIX MOTOR  
MOTOR MOUNT PLATE  
MOTOR, HYDRAULIC REMIX  
KEY 1/4” X 3/8” X 1  
KEY 1/4” SQ.  
CAPSCREW 1/2” X 13 X 1 1/2”  
LOCK WASHER 1/2”  
FITTING  
PISTON CUP HOLDER  
PISTON CUP  
HANDLE  
BOLT  
LOCKWASHER  
ALLEN SCREW  
MOTOR COUPLING  
HOSE  
505719  
EM963692  
6109180  
506203  
EM708601  
EM50417  
EM708602  
492378  
0166A  
492465  
512791  
EM25483  
2
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 79  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TANQUE TRANSMISIONHATZ 57HP ASSSY.T-45 PUMP — HOPPER ATTACHMENT ASSY.  
HOPPER ATTACHMENT ASSY.  
PAGE 80 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HOPPER ATTACHMENT ASSY.  
HOPPER ATTACHMENT ASSY.  
NO.  
1
2
3
4
PART NO.  
EM70134-1  
EM16159  
EM491686  
EM70134-2  
EM505723  
EM16166  
EM505728  
EM14165  
EM619  
EM968446  
EM505121  
EM968446  
505123  
PART NAME  
QTY.  
1
1
2
1
1
2
6
4
4
4
4
4
REMARKS  
SPLASH PLATE  
HINGE PIN  
COTTER PIN 1/8” x 1-3/4”  
SPLASH PLATE PIN  
COTTER PIN 5/32” x 1-1/2”  
ROD TIE, 1”- 8 NC X 28  
NUT, HEX 1” NC  
EYE BOLT  
WILLIAMS WASHER 3/4”  
NUT, HEX 3/4”  
5
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
BOLT, HEX  
NUT, HEX 3/4”  
BOLT 1/2” N/C X 2.1/2”  
BOLT 1/2” N/C X 2.1/2....................................... 2 .............REPLACES 492558  
NUT, HEX 1/2” X 13  
2
EM968446  
6109160  
3
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 81  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HOPPER INTERIOR ASSY.  
HOPPER INTERIOR ASSY.  
PAGE 82 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HOPPER INTERIOR ASSY.  
HOPPER INTERIOR ASSY.  
NO.  
1
PART NO.  
EM16145  
EM284  
PART NAME  
QTY.  
1
1
1
1
1
1
1
1
4
1
4
4
1
1
1
3
6
6
1
1
4
1
4
1
1
4
4
1
1
2
2
2
1
2
REMARKS  
SWING AXLE BUSHING  
1- 14 X 5 STUD GR8  
O- RING  
9
10  
11  
12  
13  
13A  
13B  
14  
16  
17  
18  
19  
20  
21  
22  
23  
24  
41  
42  
43  
44  
45  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
EM16175  
EM16170  
EM16176  
EM98022  
EM16816-2  
EM16816-1  
EM98039  
EM16804  
EM104  
EM923348  
EM25803  
EM98065  
512215  
EM491701  
EM210  
EM6109180  
EM16811  
EM25843  
EM492393  
491719  
EM923348  
EM20816  
EM16802  
EM963102  
6109180  
EM16188  
EM295  
EM969023  
EM265  
EM295  
SHUTTLE AXEL RING SEAL  
O- RING  
WEAR RING, HARD FACED  
RING, INSERT STEEL  
RING, ENERGIZED RUBBER  
BEVELED RING  
DISCHARGE SLEEVE  
BOLT 1/2- 13 X 5  
5/8LOCKWASHER  
DISCHARGE PLATE BEARING  
SEAL  
DISCHARGE NIPPLE  
GREASE FITTING  
BOLT, HEX 1/2” NC X 3 1/4 G5  
1/2LOCKWASHER  
SHUTTLE TUBE  
NUN PLATE  
BOLT, HEX HEAD 1/2” NC X 1 1/4  
PIN  
5/8 LOCK WASHER  
O- RING  
INSPECTION PLATE  
CAP SCREW, HEX BOLT  
1/2LOCKWASHER  
HOPPER SCREEN  
BOLT, COUNTERSUCK 3/4-10 X 2  
NUT LOCK 5/8”  
BOLT, FLAT HEAD 5/8”- 11 X 3”  
BOLT, FLAT HEAD 3/4”- 10 X 2”  
BOLT, HEX SOC 1/2”- 13 X 3”  
“O” RING  
EM264  
EM16190  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 83  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — SHUTTLE CYLINDER ASSY.  
SHUTTLE CYLINDER ASSY.  
PAGE 84 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — SHUTTLE CYLINDER ASSY.  
SHUTTLE CYLINDER ASSY.  
NO.  
1
PART NO.  
EM16145  
510684  
EM16169  
EM25236  
EM505490  
EM16814  
EM458  
EM417  
EM254549  
492397  
492600  
6109180  
492584  
EM505490  
EM25500  
EM509372  
EM25459  
EM509373  
EM25434  
EM254542  
EM717  
PART NAME  
QTY.  
REMARKS  
SWING AXLE BUSHING  
GREASE FITTING  
THRUSTWASHER  
SHUTTLE CRANK, SPLINED SHAFT  
GREASE FITTING  
TENSIONER  
1
2
3
1
1
1
1
1
1
1
4
4
4
4
1
1
1
1
1
1
4
5
6
7
NUT 1- 14  
8
NUT FLEX LOCK  
PIVOT BRACKET  
BOLT, HEX 1/2”- 13 X 2 1/2”  
1/2” FLAT WASHER  
1/2LOCKWASHER  
1/2” LOCK NUT  
FITTING  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
FITTING  
HOSE  
FITTING  
HOSE  
SHUTTLE CYLINDER  
CLEVIS PIN 3/4” ................................................ 1 ............ BOTTOM OF ITEM 36  
COTTER PIN  
FEMALE CLEVIS  
2
2
EM254541  
EM26126  
CLEVIS PIN ....................................................... 1 .............TOP OF ITEM 36  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 85  
Download from Www.Somanuals.com. All Manuals Search And Download.  
REAR HOOD ASSY  
ST-45 PUMP — FUEL AND HYDRAULICTANK CONNECTIONS ASSY.  
FUEL AND HYDRAULIC TANK CONNECTIONS ASSY  
PAGE 86 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — FUEL AND HYDRAULICTANK CONNECTIONS ASSY.  
FUEL AND HYDRAULIC TANK CONNECTIONS ASSY  
NO.  
5
6
7
8
PART NO.  
EM963610  
3019092  
EM969013  
EM25169  
EM251191  
EM25184  
492364  
EM923343  
EM16478  
EM16517  
EM18436  
EM50424  
EM50466  
EM27441  
EM635  
PART NAME  
QTY.  
2
2
2
2
1
1
20  
20  
1
1
1
1
1
1
4
1
4
1
4
4
1
1
1
1
1
1
1
6
1
1
8
8
1
REMARKS  
BOLT 3/8”  
WASHER FLAT 3/8”  
NUT LOCK 3/8”  
GASKET, RUBBER  
TANK COVER PLATE  
RESEVOIR GASKET  
BOLT HHC 5/16” X 18 X 1”  
WASHER LOCK 5/16” DIAMETER  
SIGHT GAUGE, HYDRAULIC OIL  
BUSHING 912 X 2 RED, REMOVER  
ELBOW, 90 DEGREE MALE  
STRAINER, 2.5 SUCTION  
O- RING  
ELBOW  
LOCK 1/2” HI COLLAR  
HOSE  
CLAM 2”  
ELBOW  
BOLT 1/2” UNC X 1- 1/2”  
LOCK 1/2”  
O-RING  
GAUGE 3000 PSI  
ADAPTER 4- 4- GTX- S  
GAUGE 5000 PSI  
ELBOW  
9
10  
11  
12  
13  
24  
25  
26  
27  
28  
29  
31  
32  
33  
34  
35  
36  
43  
44  
45  
46  
47  
49  
50  
51  
52  
53  
54  
55  
57  
58  
60  
61  
62  
EM509437  
EM26471  
EM27442  
EM963692  
EM635  
509436  
EM90766  
EM25523  
EM97067  
EM491396  
EM16414  
EM16477  
492267  
511010  
511012  
492357  
2101402  
EM25217  
20426  
508827  
EM20421  
509517  
VALVE NEEDLE  
CAP HYDRAULIC OIL TANK  
BOLT, ALLEN 3/16” DIAMETER  
COVER PLATE  
GASKET  
BOLT HHC 1/4”- 20 X 12  
WASHER LOCK 1/4” DIAMETER  
FUEL FILLER CAP- BR  
90° FITTING  
HOSE, FUEL GAUGE  
FITTING, BALL END CNTRL, CABLE  
HOSE  
1
1
1
1
509516  
HOSE  
1
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 87  
Download from Www.Somanuals.com. All Manuals Search And Download.  
REAR HOOD ASSY.  
ST-45 PUMP — FUEL AND HYDRAULICTANK ASSY. (CONTINUED)  
FUEL AND HYDRAULIC TANK ASSY. (CONTINUED)  
PAGE 88 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — FUEL AND HYDRAULICTANK ASSY. (CONTINUED)  
FUEL AND HYDRAULIC TANK ASSY. (CONTINUED)  
NO.  
1
2
PART NO.  
509772  
509786  
PART NAME  
QTY.  
1
1
REMARKS  
RESERVOIR, FUEL AND HYDRAULIC OIL  
ELBOW, SUCTION  
ELBOW  
3
510591  
1
4
491164  
EM18447  
509369  
491237  
506094  
16512  
EM963610  
0166A  
16433  
16516  
EM16513  
510674  
509794  
EM509795  
510675  
EM510676  
EM509371  
20426  
512769  
506208  
20426  
EM20763  
EM165121  
SUCTION NIPPLE 3/4”  
PLUG 3/4” PIPE SQ H  
ADAPTER 1/2- FF- S  
GATE VALVE 1/2” NPT FEMALE VALVE  
PLUG 1/2” NPT GALVANIZED  
RETURN FILTER ASSY.  
CAP SCREW  
WASHER, LOCK 3/8” DIAMETER  
ELBOW  
TUBE  
1
1
1
1
1
1
4
4
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
37  
38  
39  
40  
41  
42  
61  
62  
63  
64  
68  
69  
DEFUSER  
NIPPLE 1-1/4” x 2-1/2”  
COUPLING GALV 1 1/4”  
ELBOW, 1- 1/4 PIPE/ 1- 1/4 JIC  
HOSE  
ELBOW  
HOSE  
FITTING  
HOSE, FUEL  
CLAMP, HOSE  
FITTING  
FILTER, FUEL  
RETURN FILTER ELEMENT  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 89  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FRONT COVER ASSY.  
FRONT COVER ASSY.  
ST-45 PUMP — FRONT COVER ASSY.  
PAGE 90 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — FRONT COVER ASSY.  
FRONT COVER ASSY.  
NO.  
7
8
PART NO.  
EM963003  
EM923057  
2101402  
EM510271  
29057  
EM969079  
4384102  
510687  
PART NAME  
QTY.  
19  
23  
15  
1
1
4
REMARKS  
BOLT 1/4” NC X 3/4”  
WASHER, FLAT 1/4”  
WASHER, LOCK 1/4” DIAMETER  
COVER, FRONT  
9
10  
14  
17  
18  
19  
DOCUMENT BOX  
NUT LOCK NYLON 1/4”  
CAP, AIR INTAKE  
1
1
COVER, TOP  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 91  
Download from Www.Somanuals.com. All Manuals Search And Download.  
RADIATOR ASSY.  
ST-45 PUMP — HEAT EXCHANGER ASSY.  
HEAT EXCHANGER ASSY.  
PAGE 92 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HEAT EXCHANGER ASSY.  
HEAT EXCHANGER ASSY.  
NO.  
PART NO.  
EM509802  
EM963610  
3019892  
PART NAME  
GUARD, HEAT EXCHANGER  
BOLT 3/8”  
QTY.  
1
4
6
4
1
1
4
4
4
1
6
6
6
1
1
1
1
1
2
1
1
1
1
1
REMARKS  
1
2
3
WASHER, FLAT 3/8”  
NUT, LOCK 3/8”  
GASKET, RUBBER  
HEAT EXCHANGER  
SCREW HHC 5/16” X 18 X 1”  
WASHER, FLAT 5/16”  
NUT, NYLON 5/16”- 18  
COVER  
BOLT 1/4” NC X 3/4”  
WASHER, FLAT 1/4”  
WASHER, LOCK 1/4”  
FITTING, HYDRAULIC  
TEE, FITTING  
ELBOW  
HOSE  
CLAMP  
WASHER LOCK 7/16”  
TEE, FITTING  
FITTING  
NUT  
HOSE, HYDRAULIC  
HOSE, HYDRAULIC  
HOSE, HYDRAULIC  
4
5
6
7
EM969013  
EM25171  
EM98049  
492364  
8
9
EM923023  
2105164  
10  
11  
12  
13  
14  
15  
16  
17  
18  
20  
21  
22  
23  
24  
25  
26  
EM509805  
EM963003  
EM923057  
2101402  
EM25498  
EM25566  
EM509401  
EM509400  
EM98048  
EM492625  
EM509344  
EM509345  
EM509402  
EM509378  
EM510984  
EM509374  
1
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 93  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ENGINE AND FRAME ASSY  
ENGINE AND FRAME ASSY  
ST-45 PUMP — ENGINE AND FRAME ASSY.  
PAGE 94 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — ENGINE AND FRAME ASSY.  
ENGINE AND FRAME ASSY  
NO.  
1
2
3
4
PART NO.  
TBD  
020310080  
EM23118  
EM01005  
TBD  
PART NAME  
QTY.  
4
4
4
2
REMARKS  
NUT  
NUT  
SHOCK MOUNT  
CONNECTOR LINK, CHAIN  
NUT  
5
4
6
7
8
9
10  
11  
29  
30  
31  
32  
35  
36  
37  
509405  
503117  
FRAME, MAIN  
BOLT, HEX 3/8”  
WASHER 3/8”  
NUT, NYLOC  
RUBBER PAD  
JACK STAND, FRONT  
JACK STAND, REAR  
PIN  
CLEVIS PIN 1/2” X 4”  
CONNECTOR  
TAG, IDENTIFICATION  
RIVET  
1
2
2
1
1
1
2
2
2
2
1
2
3019092  
EM969013  
508776  
EM25610  
EM70186  
EM745  
EM744  
EM20732  
EM942  
491744  
EM60701  
HATZ DIESEL ENGINE 57HP  
1
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 95  
Download from Www.Somanuals.com. All Manuals Search And Download.  
THROTTLE AND WATER FILTER ASSY.  
ST-45 PUMP THROTTLE ANDWATER FILTER ASSY.  
THROTTLE AND WATER FILTER ASSY.  
PAGE 96 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP THROTTLE ANDWATER FILTER ASSY.  
THROTTLE AND WATER FILTER ASSY.  
NO.  
29  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
61  
PART NO.  
EM509414  
EM969013  
EM509510  
EM959119  
492357  
EM959179  
EM207091  
EM968435  
EM26315  
EM963003  
2101402  
EM923057  
492561  
510229  
EM501102  
EM491089  
492364  
2105164  
510732  
EM510733  
510725  
EM510731  
EM509449  
EM269  
EM16747  
EM963003  
2101402  
EM20426  
506208  
PART NAME  
QTY.  
1
1
1
1
1
1
1
2
1
4
4
4
4
1
1
1
1
2
1
1
1
1
1
2
1
3
3
4
2
1
REMARKS  
BRACKET  
NUT LOCK 3/8”  
SPRING  
CLEVIS YOKE 1/4- 28  
SCREW HHC 1/4”- 20 X 12  
NUT LOCK NYLON 1/4”  
KIT, SOLENOID W/BRACKET  
NUT 1/4”- 20” HEX  
SAFETY LINK ASSEMBLY  
BOLT 1/4” NC X 3/4”  
WASHER, LOCK 1/4” DIAMETER  
WASHER, FLAT 1/4”  
NUT, HEX 1/4”- 20  
CABLE THROTTLE ASSY.  
BUSHING, LOCK  
BOLT  
SCREW HHC 5/16” X 18 X 1”  
NUT NYLON 5/16- 18  
HOSE CLAMP  
HOSE  
CLAMP  
CAP, RAIN  
BRACKET  
M10 X 30MM SOC HDCS  
FILTER ASSY, WATER SEPERATOR  
BOLT 1/4” NC X 3/4”  
WASHER, LOCK 1/4” DIAMETER  
FITTING  
CLAMP  
HOSE, FUEL  
512790  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 97  
Download from Www.Somanuals.com. All Manuals Search And Download.  
HYDRAULIC PUMP ASSY.  
HYDRAULIC PUMP ASSY.  
ST-45 PUMP — HYDRAULIC PUMP ASSY.  
PAGE 98 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — HYDRAULIC PUMP ASSY.  
HYDRAULIC PUMP ASSY.  
NO.  
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
20  
22  
23  
24  
25  
26  
28  
60  
61  
63  
64  
65  
PART NO.  
EM16306  
EM146  
EM16303  
EM16302  
EM16741  
EM162  
EM98025  
EM510902  
EM635  
PART NAME  
QTY.  
1
6
1
1
1
10  
1
2
2
2
1
1
1
1
1
4
1
1
1
2
2
1
1
1
1
1
1
1
1
REMARKS  
COUPLING, ENGINE  
BOLT 12 MM X 1” ALLEN HEAD  
COUPLING, CHAIN  
COUPLING, PUMP  
COVER, ENGINE  
BOLT 10 X 25MM SOC. HEAD  
PUMP, PISTON  
SCREW  
WASHER, LOCK 1/2”  
WASHER, FLAT 1/2” DIAMETER  
FITTING 8C5 X- S  
ELBOW 6801- 04- 04  
HOSE  
492600  
EM25507  
EM25429  
EM509366  
EM505533  
EM97001  
EM509341  
EM25497  
EM25429  
EM97002  
EM963610  
0166A  
EM25498  
EM16524  
506195  
509637  
509370  
O- RING  
MANIFOLD ASSY.  
BOLT, ALLEN 3/8”- 16 X 5”  
FILTTING  
ELBOW 6801- 04- 04  
PUMP, DUAL GEAR  
CAP SCREW  
WASHER, LOCK 3/8” DIAMETER  
FITTING - ADAPTOR  
FITTING, 90°  
FITTING, 90°  
HOSE  
HOSE  
HOSE  
510984  
509374  
509371  
HOSE  
HOSE  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 99  
Download from Www.Somanuals.com. All Manuals Search And Download.  
LUBRICATION PISTONS ASSY.  
LUBRICATION PISTONS ASSY.  
ST-45 PUMP — LUBRICATION PISTONS ASSY.  
PAGE 100 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — LUBRICATION PISTONS ASSY.  
LUBRICATION PISTONS ASSY.  
NO.  
1
2
3
4
5
6
7
8
PART NO.  
510749  
EM507895  
492378  
3019092  
0166A  
510755  
PART NAME  
LUBRICATION BOX  
PLUG  
QTY.  
1
1
6
6
6
1
2
4
8
8
8
2
2
2
2
2
2
6
2
6
2
2
2
8
8
8
1
2
2
8
2
2
1
2
1
2
4
2
REMARKS  
BOLT G5 HHCS  
WASHER, FLAT 3/8”  
WASHER, LOCK3/8” DIAMETER  
COVER, LUBRICATION BOX  
CYLINDER, CONCRETE  
RETAINER, CYLINDER  
CAP SCREW  
WASHER LOCK 3/8” DIAMETER  
WASHER FLAT 3/8”  
O- RING, OILER PLATE  
OILER PLATE  
FELT HOLDER  
RING, FELT  
RING, BRONZE  
CUP, PISTON- ORANGE  
PISTON CUP SPACER  
FACE PLATE  
BOLT, HEX HEAD 3/8 NC x 3-1/4 IN GS  
O- RING  
EM80801  
EM25110  
EM963610  
EM0166A  
3019092  
EM14407  
EM98033  
EM16462  
EM16493  
EM14408  
EM98050  
EM16465  
EM16464  
510265  
EM16174  
EM50425  
EM274351  
EM492451  
3019092  
EM50443  
510516  
EM97024  
EM97025  
504505  
EM25497  
EM491701  
510515  
EM25497  
EM25474  
EM16454  
505723  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
42  
43  
44  
45  
FLANGE, RING  
SEAL LUBE BOX  
BOLT 3/8”- 24 X 1” HEX HEAD  
WASHER, FLAT 3/8”  
SEAL, OIL BOX  
CYLINDER, DRIVE  
SWITCH PROXIMITY  
CABLE PROXIMITY SWITCH  
WRAP TIE  
FITTING, 90°  
FITTING, GREASE  
CYLINDER, SLAVE  
FITTING, 90°  
HOSE, HYDRAULIC  
PIN, WRIST  
PIN, COTTER  
HOSE, HYDRAULIC  
EM509511  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 101  
Download from Www.Somanuals.com. All Manuals Search And Download.  
SISTEMA ELECTRICO HATZ ASSY.  
ELECTRICAL SYSTEM ASSY.  
ST-45 PUMP — ELECTRICAL SYSTEM ASSY.  
PAGE 102 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — ELECTRICAL SYSTEM ASSY.  
ELECTRICAL SYSTEM ASSY.  
NO.  
1
2
3
4
5
6
7
8
PART NO.  
512759  
491028  
491030  
EM256073  
512760  
512761  
505303  
508437  
512762  
512763  
EM98066  
508632  
508259  
512764  
504984  
512800  
512801  
512802  
512803  
508259  
512804  
491894  
512805  
512806  
512807  
EM97025  
508632  
508238  
505501  
PART NAME  
CABLE HARNESS  
CABLE WRAP  
QTY.  
REMARKS  
1
5
5
5
5
1
2
2
CABLE WRAP  
CONNECTOR BOOT II  
CONDUCTOR CABLES  
SHIELD, CABLE  
TERMINAL CONNECTION  
TERMINAL CONNECTOR  
WIRE, HEAT EXCHANGER ............................... 1 ............. WHITE  
WIRE, HEAT EXCHANGER ............................... 1 ............. BLUE  
HOLDER, FUSE  
FUSE 25 AMP  
CONNECTOR  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
28  
29  
30  
1
1
2
WIRE - 1.5M ....................................................... 1 ............. RED  
TERMINAL CONNECTOR 3.8”  
STARTER CONDUCTOR CABLE  
SHIELD, CABLE  
WIRE, PUMP ...................................................... 1 ............. BLUE  
PUMP WIRE  
CONNECTOR  
PUMP CONDUCTOR CABLES  
TERMINAL CONNECTOR .................................. 2 ............. BLUE  
CABLE, SOLENOID ........................................... 1 ............. RED  
CABLE, SOLENOID ........................................... 1 ............. WHITE  
CABLE, SOLENOID CONDUCTOR  
CABLE, PROXIMITY SWITCH  
FUSE 25 AMPS  
1
1
1
1
2
1
1
2
1
1
2
BLOCK FUSE  
FUSE TERMINAL  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 103  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MANIFOLD ACUMULADOR ASSY.  
ACCUMULATOR ASSY.  
ST-45 PUMP — ACCUMULATOR ASSY.  
PAGE 104 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — ACCUMULATOR ASSY.  
ACCUMULATOR ASSY.  
NO.  
34  
35  
36  
37  
38  
39  
40  
42  
43  
PART NO.  
EM97015  
EM97016  
EM9603055  
3019092  
PART NAME  
QTY.  
REMARKS  
ACCUMULATOR 1 GALLON  
BRACKET, ACCUMULATOR  
HHCS 3/8” DIAMETER  
WASHER, FLAT 3/8”  
WASHER, LOCK 3/8” DIAMETER  
FITTING  
1
1
2
2
2
1
1
1
1
0166A  
EM509425  
EM509353  
EM98009  
509372  
ELBOW  
ACCUMULATOR REPAIR KIT  
HOSE, ACCUMULATOR  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 105  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MANIFOLD ASSY.  
MANIFOLD ASSY.  
PAGE 106 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — MANIFOLD ASSY.  
MANIFOLD ASSY.  
NO.  
1
2
3
4
5
6
7
8
PART NO.  
EM97000  
EM963610  
3019092  
0166A  
EM25462  
EM98018  
EM25429  
EM98015  
TBD  
PART NAME  
QTY.  
1
4
4
4
1
3
2
2
REMARKS  
MANIFOLD ASSY.  
BOLT 3/8”  
WASHER, FLAT 3/8”  
WASHER, LOCK 3/8” DIAMETER  
STRAIGHT CONNECTOR 12- 16F5X  
TEST PORT  
ADAPTOR, ELBOW 6801- 04- 04  
TEST PORT  
9
ADAPTOR, ELBOW  
1
10  
11  
12  
13  
15  
20  
21  
22  
23  
24  
25  
26  
27  
28  
TBD  
PLUG  
FITTING, HYDRAULIC  
ADAPTOR, ELBOW  
ADAPTOR, ELBOW  
STRAIGHT CONNECTOR 12- 16F5X  
ADAPTER  
CARTRIDGE, PILOT RELIEF  
SOCKET HEAD 3/8”-NCx2.5”  
SOCKET HEAD 1/4”-NCx2.25”  
SOCKET HEAD 10-NCx2”  
DIRECTIONAL CONTROLVALVE  
PILOT VALVE  
1
4
1
1
2
1
1
8
4
4
1
1
1
1
EM25498  
EM509352  
EM509353  
EM25462  
EM509398  
EM97010  
EM50932  
EM196  
EM508804  
EM97011  
EM97002  
EM97013  
EM97008  
DIRECTIONAL CONTROLVALVE  
CARTRIDGE, UNLOADING VALVE  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 107  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — REMIXER CONTROL ASSY.  
REMIXER CONTROL ASSY.  
PAGE 108 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — REMIXER CONTROL ASSY.  
REMIXER CONTROL ASSY.  
NO.  
22  
23  
24  
25  
26  
27  
28  
30  
32  
33  
PART NO.  
EM97017  
EM218  
EM923343  
492553  
EM25507  
EM512655  
506195  
EM25563  
EM98012  
EM98015  
PART NAME  
QTY.  
REMARKS  
VALVE REMIX W/LEVER  
BOLT 5/16”- 18 X 2, 1/2HXHDCS  
WASHER, LOCK 5/16” DIAMETER  
NUT, HEX 5/16” DIAMETER- NC  
FITTING, 90°  
1
2
2
2
1
2
2
1
1
1
ADAPTER  
FITTING, 90°  
TEE, CUSTOM  
ADAPTER GAUGE  
COUPLING, TEST PORT  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 109  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — BATTERY ASSY.  
BATTERY ASSY  
PAGE 110 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — BATTERY ASSY.  
BATTERY ASSY  
NO.  
1
2
3
4
5
6
7
PART NO.  
492561  
PART NAME  
QTY.  
REMARKS  
NUT, HEX 1/4” X 20  
1/4” FLAT WASHER  
1/4LOCKWASHER  
BATTERY HOLDER FRAME  
CABLE, BATTERY NEGATIVE  
CABLE, BATTERY POSITIVE  
BATTERY  
2
2
2
1
1
1
1
EM923057  
EM492622  
EM25708  
EM16707  
EM509105  
EM16738  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 111  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — LUBRICATION PANEL  
GREASE POINTS  
Grease daily, two or three hots  
of #2 multipurpose automotive  
grease. Over greasing any  
NOTE:  
bearing will not damage the  
machine.ALWAYS grease  
before and after pump  
operation.  
POSITION  
LOCATION  
LENGTH OF LINES  
A ................................................. PIVOT BRACKET GREASE POINT ................................. 41 in. (1.5 m)  
B ................................................. AXLE CRANK GREASE POINT....................................... 34 in. (1.1 m)  
C................................................. SWING AXLE BUSHING GREASE POINT...................... 26 in. (.85 m)  
PAGE 112 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — LUBRICATION PANEL  
GREASE POINTS  
NO.  
1
2
3
4
5
6
PART NO.  
EM491701  
EM208812  
EM510684  
EM510486  
EM510487  
TBD  
PART NAME  
QTY.  
REMARKS  
GREASE FITTING  
CONNECTOIR  
CONNECTOR  
3
2
3
1
1
1
HOSE, PLASTIC  
HOSE, PLASTIC  
HOSE, STEEL  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 113  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TAILLIGHT ASSY  
TAILLIGHT ASSY.  
ST-45 PUMP TAILLIGHT ASSY.  
PAGE 114 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TAILLIGHT ASSY.  
TAILLIGHT ASSY.  
NO.  
2
3
4
5
6
7
8
PART NO.  
EM26536  
EM265361  
492364  
EM923343  
492553  
PART NAME  
QTY.  
REMARKS  
TAIL LIGHT ASSY.  
TAIL LIGHT BRACKET  
SCREW, HHC 5/16” X 18- 1  
5/16LOCKWASHER  
NUT, HEX 5/16”  
2
2
4
4
4
1
1
EM256072  
EM256071  
SOCKET, FEMALE  
PLUG, MALE  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 115  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX INTERIOR DOOR ASSY.  
CONTROL BOX INTERIOR DOOR ASSY.  
PAGE 116 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX INTERIOR DOOR ASSY.  
CONTROL BOX INTERIOR DOOR ASSY.  
NO.  
1
2
3
4
5
6
7
8
PART NO.  
EM97050  
EM97048  
EM97027  
EM97078  
EM98001  
EM98002  
EM40711  
TBD  
PART NAME  
RELAY , SMALL  
RELAY, LARGE  
SOLENOID, 12 VOLT  
FUSE, 15 AMP  
DIODE, 6 AMP  
QTY.  
2
1
3
6
1
19  
1
REMARKS  
DIODE  
SWITCH, EMERGENCY CYCLE  
NUT  
4
9
10  
12  
TBD  
EM97068  
EM97049  
CONNECTOR  
REMOTE CONTROL RECEPTACLE  
BASE, SOCKET  
4
1
1
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 117  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX MOUNTING ASSY.  
CONTROL BOX MOUNTING ASSY.  
PAGE 118 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX MOUNTING ASSY.  
CONTROL BOX MOUNTING ASSY.  
NO.  
35  
36  
PART NO.  
492366  
EM510703  
PART NAME  
SCREW HHC 5/16-18x1-1/2  
SHOCK MOUNT  
QTY.  
4
4
REMARKS  
37  
38  
39  
40  
2105164  
EM503112  
3019092  
NUT 3/8 IN.  
4
2
4
2
REPLACES 492582  
BOLT HHC 3/8-16x2-3/4  
FLAT WASHER  
NUT  
REPLACES 492598  
REPLACES 492583  
EM969013  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 119  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX ASSY.  
CONTROL BOX ASSY.  
PAGE 120 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX ASSY.  
CONTROL BOX ASSY.  
NO.  
1
2
3
4
5
6
7
8
PART NO.  
EM25704  
EM97063  
EM97039  
EM97041  
EM97062  
EM97028K  
EM97028  
EM97030  
EM97036  
EM97045  
EM97032  
EM97073  
EM98039  
PART NAME  
QTY.  
1
1
3
3
1
1
1
1
1
1
2
1
REMARKS  
TACHOMETER  
EMERGENCY STOP SWITCH  
LENS, BATTERY, OIL FILTER, AIR FILTER  
CONTACT BLOCK  
HOUR METER  
KEY, IGNITION  
IGNITION SWITCH W/ KEY  
DIRECTIONAL CONTROL SWITCH  
PUMP CONTROL SWITCH  
OPERATION PUMP/ENGINE SWITCH  
SWITCH, FAN CONTROL, TEST FUNCTION  
CONTROL BOX ASSY, COMPLETE  
PANEL, FACE  
9
10  
11  
12  
13  
1
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 121  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX DOORWIRING DIAGRAM  
PAGE 122 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX INTERIORWIRING DIAGRAM  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 123  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP TERMINAL BLOCKWIRING DIAGRAM  
PAGE 124 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX ELECTRICAL SCHEMATIC  
FUSE LINK  
K2  
TB1-11  
RED 51  
FU2  
15A 15A  
RED 30  
+
12 VDC  
BATTERY  
FU 4  
FU1  
FU3  
15A  
START  
K1  
RUN  
START  
OFF  
3
TB1-10  
TB1-1  
BLK 44  
4
D4  
RUN  
K2  
[0]  
GND INSIDE BOX  
DURING INSTALL  
BLK 45  
BLK 39  
1
2
D5  
HI THROTTLE  
SOL  
SW1  
K6  
A1  
TB1-24  
TB1-25  
TB1-4  
B+  
[22]  
W
D7  
K1  
BLK 22  
WHT 0  
D
S
ALT  
D+  
G
G
TACH  
[1]  
RED 1  
TB1-2  
30  
[3]  
[7]  
RED 3  
TB1-5  
TB1-6  
TB2-3 D1 (6AMP) TB2-2  
BLK 7  
STRTR  
SOL  
D3 TB2-1  
WHT 0  
BATTERY  
TB2-4  
D2  
[2]  
BLK 2  
TB1-3  
TB1-8  
R
PL3  
0
7
3
OIL PRESS  
[4]  
BLK 4  
R
PL2  
AIR FILTER  
MAGNET  
VALVE  
START-STOP  
[17]  
BLK 17  
TB1-7  
R
PL1  
EXTERNAL HATZ ENGINE  
AND BATTERY WIRES  
PUMP ENGINE  
K3  
BLK 53  
2
BLK 55  
K6  
12  
9
4
1
D18  
SW3  
HYD PRESS  
COMPENSATOR  
K3  
D6  
D8  
BLK 52  
TB1-16  
TB1-17  
1
K3  
K4  
6. SPARE TERMINALS  
TB1-9, TB1-21,TB1-30 AND TB31  
9
5
3
2
K3  
K4  
5. HATZ ENGINE (DIESEL) WIRES  
ARE IN [ ] BRACKETS.  
BLK 35  
BLK 36  
TB1-18  
A
B
10 11  
12  
8
A2  
PILOT  
VALVE  
SOL  
O O O O  
5
4. TB1 = SYSTEM INTERCONNECT  
TERMINAL STRIP  
TB1-19  
TB1-20  
BLK 34  
+
-
HOUR  
METER  
K4  
TB2 = DIODE INTERCONNECT  
TERMINAL STRIP  
3
4
3. UNUSED REF DESIG:.  
TB1-9, TB1-21,TB1-30, TB31,  
AND WIRE NO. 57  
K4  
PROX SW  
BLK  
D9  
TB1-26  
TB1-27  
TB1-28  
ENGINE  
SIDE  
SW  
10  
9
BLU  
BLK 34  
BRN  
BLK 40  
K4  
2. LAST USED REF DESIG:  
D21, WIRE NO.57  
5
6
8
7
TB2-6  
TB2-7  
D10  
1. WIRE COLOR CODE:  
RED = +12 VDC  
BLK 42  
TB2-5  
BLK 34  
TB1-29  
BLK  
BLU  
WHT = 12 VDC GROUND (GND)  
BLK = ALL OTHERS  
K4  
BRN  
D11  
BLK 32  
PROX SW  
WHT 0  
SHEET 1 OF 2  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 125  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 PUMP — CONTROL BOX ELECTRICAL SCHEMATIC  
BLK 32  
WHT  
TB1-12  
+
FAN  
OFF  
ON  
MOTOR  
TEST  
SOL  
BLK 31  
4
3
SW5  
TB1-13  
D13  
TB1-14  
TB1-15  
UNLOAD  
SOL  
BLK 32  
BLK 33  
PRESS TEST  
D14  
D15  
OFF  
ON  
PRESS  
TEST  
SOL  
3
4
SW2  
TB1-16  
TB1-22  
K5  
9
5
8
K5  
BLK 38  
12  
REV  
SOL  
DIRECTION  
FWD  
CONTROL  
OFF  
D12  
REV  
ON  
REM  
TB1-23  
BLK 32  
BLK 37  
4
3
2
1
SW4  
TB2-8  
D17  
OPERATION  
PUMP ENG  
3
3
4
4
BLK 57  
TB2-9  
BLK 50  
13  
14  
BLK 41  
K3  
D16  
K5  
2
1
SW6  
SW3  
D19  
(REFER TO LOCATION B7)  
TB2-10  
13  
14  
REMOTE CONTROL  
D20  
J1  
REV  
ON  
FWD  
WHT  
BLK 49  
GRN 56  
BLK 48  
GRN  
BLK  
PUMP  
0FF  
SHEET 2 OF 2  
PAGE 126 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 — INTERCONNECT HYDRAULIC CONTROL BOX  
EXISTING HATZ ENGINE  
WIRING  
MAYCO WIRING  
TB1  
14  
33  
17  
52  
2
3
4
5
6
7
9
10  
11  
30  
12  
31  
13  
15  
33  
16  
20  
36  
21  
22  
0
23  
38  
1
8
18  
35  
19  
[0]  
[0]  
[0]  
[1]  
[2]  
[22]  
[3]  
[0]  
0
0
0
0
0
0
D+  
B+  
W
2
ALT  
AIR  
FILT  
SW  
ENG  
OIL  
PRES  
SW  
STRTR  
B
A
SOL  
50  
COOL  
FAN  
MOTOR  
PRESS  
TEST  
SOL  
HYD  
PRESS  
COMP  
UNLOAD  
SOL  
PILOT  
VALVE  
SOL  
PILOT  
VALVE  
SOL  
1
0
3
7
TB1  
FUSE  
LINK  
GROUND TERMINAL  
BUS BAR  
ACS SUPPLIED  
28  
24  
39  
25  
26  
27  
29  
30  
31  
42  
40  
34  
0
0
0
34  
BRN  
MAGNETIC VALVE  
START - STOP  
10 GA RED  
PROX SWITCH  
ROD -BACK SIDE  
PROX SWITCH HEAD -  
FRONT SIDE (ENG -SIDE)  
HI THROTTLE  
SOL  
A3  
A4  
1500  
500  
2500  
3000  
3
1000  
4000  
5000  
10 GA WHITE  
0
LHA  
0
LHA  
ACCUMULATOR  
PRESSURE GUAGE  
PUMPING  
PRESSURE GUAGE  
0-3000 PSI  
0-5000 PSI  
BULKHEAD  
FITTINGS  
NOTES:  
1. HATZ ENGINE WIRES ARE IN [ ] BRACKETS  
2. ALL MAYCO WIRES ARE CONNECTED TO TB1  
3. GROUND WIRE SUPPLIED WITH CONTROL  
PANEL. CONNECTION MADE INSIDE PANEL  
TO MOUNTING HARDWARE. SCAPE PAINT  
TO ENSURE GROUND INTEGRITY.  
HYD LINE FROM  
PUMP PRESS  
HYD LINE FROM  
ACCUM PRESS  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 127  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 — HYDRAULIC DIAGRAM  
Part ID  
1
Description  
MAIN PUMP 3000 PSI  
Quantity  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
2
1
1
2
SECONDARY PUMP, ACCUMULATOR & REMIXER  
FLOW CONTROL BLOCK ASSEMBLY  
FLOW CONTROL  
3
3A  
3B  
4
RELIEF VALVE, FLOW CONTROL  
MAIN MANIFOLD ASSEMBLY  
MAIN VALVE  
4A  
4B  
4C  
4D  
4E  
4F  
4G  
4H  
5
SHUTTLE VALVE  
PILOT VALVE  
ACCUMULATOR CIRCUIT DUMP VALVE  
UNLOADING VALVE  
CHECK VALVE  
RELIEF, ACCUMULATOR CIRCUIT  
TEST VALVE  
ACCUMULATOR  
6
PROXIMITY SWITCH  
6A  
7
CONDUCTOR CABLE, PROXIMITY SWITCH  
DIRECTIONAL VALVE, REMIXER  
MOTOR, REMIXER  
8
9
SHUTTLE CYLINDER  
10  
11  
MAIN CYLINDER  
HEAT EXCHANGER  
PAGE 128 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ST-45 — OPTIONAL RADIO CONTROL  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 129  
Download from Www.Somanuals.com. All Manuals Search And Download.  
TERMS AND CONDITIONS OF SALE — PARTS  
Effective:October 1, 2002  
PAYMENTTERMS  
5. Parts must be in new and resalable Rebatesforpricedeclinesandaddedcharges  
condition,intheoriginalMultiquippack- forpriceincreaseswillnotbemadeforstockon  
age (if any), and with Multiquip part handatthetimeofanypricechange.  
Terms of payment for parts are net 10 days.  
FREIGHTPOLICY  
numbersclearlymarked.  
Multiquip reserves the right to quote and sell  
All parts orders will be shipped collect or  
prepaidwiththechargesaddedtotheinvoice.  
All shipments are F.O.B. point of origin.  
Multiquip’sresponsibilityceaseswhenasigned  
manifest has been obtained from the carrier,  
andanyclaimforshortageordamagemustbe  
settledbetweentheconsigneeandthecarrier.  
6. Thefollowingitemsarenotreturnable: directtoGovernmentagencies,andtoOriginal  
EquipmentManufactureraccountswhouseour  
productsasintegralpartsoftheirownproducts.  
price book and shows as being  
a. Obsolete parts.(If an item is in the  
replaced by another item, it is SPECIALEXPEDITINGSERVICE  
obsolete.)  
A$35.00surchargewillbeaddedtotheinvoice  
b. Any parts with a limited shelf life for special handling including bus shipments,  
(such as gaskets, seals, “O” rings, insuredparcelpostorincaseswhereMultiquip  
and other rubber parts) that were mustpersonallydeliverthepartstothecarrier.  
MINIMUMORDER  
TheminimumchargeforordersfromMultiquip  
is $15.00 net. Customers will be asked for  
instructionsregardinghandlingofordersnot  
meetingthisrequirement.  
purchased more than six months  
priortothereturndate.  
LIMITATIONSOFSELLER’SLIABILITY  
Multiquip shall not be liable here under for  
damagesinexcessofthepurchasepriceofthe  
itemwithrespecttowhichdamagesareclaimed,  
c. Anylineitemwithanextendeddealer  
netpriceoflessthan$5.00.  
RETURNEDGOODSPOLICY  
d. Special order items.  
andinnoeventshallMultiquipbeliableforloss  
of profit or good will or for any other special,  
consequentialorincidentaldamages.  
Returnshipmentswillbeacceptedandcredit  
willbeallowed,subjecttothefollowingprovi-  
sions:  
e. Electricalcomponents.  
f. Paint,chemicals,andlubricants.  
g. Decalsandpaperproducts.  
h. Itemspurchasedinkits.  
LIMITATIONOFWARRANTIES  
1. AReturnedMaterialAuthorizationmust  
be approved by Multiquip prior to ship-  
ment.  
Nowarranties,expressorimplied,aremadein  
connectionwiththesaleofpartsortradeacces-  
soriesnorastoanyenginenotmanufacturedby  
Multiquip.Suchwarrantiesmadeinconnection  
with the sale of new, complete units are made  
exclusively by a statement of warranty  
packagedwithsuchunits,andMultiquipneither  
assumesnotauthorizesanypersontoassume  
foritanyotherobligationorliabilitywhateverin  
connection with the sale of its products.Apart  
fromsuchwrittenstatementofwarranty,there  
arenowarranties,express,impliedorstatutory,  
which extend beyond the description of the  
productsonthefacehereof.  
7. The sender will be notified of any  
materialreceivedthatisnotacceptable.  
2. ToobtainaReturnMaterialAuthorization,  
alistmustbeprovidedtoMultiquipParts  
Salesthatdefinesitemnumbers,quanti-  
ties, and descriptions of the items to be  
returned.  
8. Such material will be held for five  
workingdaysfromnotification,pending  
instructions. If a reply is not received  
within five days, the material will be  
returnedtothesenderathisexpense.  
a. Thepartsnumbersanddescriptions  
must match the current parts price  
list.  
9. Creditonreturnedpartswillbeissuedat  
dealer net price at time of the original  
purchase,lessa15%restockingcharge.  
b. The list must be typed or computer  
generated.  
10. Incaseswhereanitemisaccepted,for  
which the original purchase document  
cannotbedetermined,thepricewillbe  
basedonthelistpricethatwaseffective  
twelvemonthspriortotheRMAdate.  
c. The list must state the reason(s) for  
thereturn.  
d. The list must reference the sales  
order(s)orinvoice(s)underwhichthe  
itemswereoriginallypurchased.  
11. Credit issued will be applied to future  
purchasesonly.  
e. The list must include the name and  
phonenumberofthepersonrequest-  
ingtheRMA.  
PRICINGANDREBATES  
Prices are subject to change without prior  
notice.Pricechangesareeffectiveonaspe-  
cific date and all orders received on or after  
3. AcopyoftheReturnMaterialAuthoriza-  
tionmustaccompanythereturnshipment.  
4. Freight is at the sender’s expense. All that date will be billed at the revised price.  
partsmustbereturnedfreightprepaidto  
Multiquip’sdesignatedreceivingpoint.  
PAGE 130 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)  
Download from Www.Somanuals.com. All Manuals Search And Download.  
MAYCO PUMPWARRANTY  
Mechanical Drive Models  
Hydraulic Drive Models  
MAYCO PUMP, hereinafter referred to as “Manufacturer’,  
warrants each new Mayco Pump sold by the manufacturer to  
be free from defects in material and workmanship, under normal  
use and service, for a period of one year after the date of delivery  
to the original retail purchaser.Manufacturer will, at its option,  
replace or repair at a point designated by the Manufacturer any  
part or parts which shall appear to the satisfaction of the  
Manufacturer upon inspection at such point to have been  
defective in material or workmanship.This warranty does not  
obligate the Manufacturer to bear any transportation charges  
or labor charges in connection with the replacement or repair  
the of the defective parts.  
MAYCO PUMP, hereinafter referred to as “Manufacturer”,  
warrants each new Mayco Pump sold by the manufacturer to  
be free from defects in material and workmanship, under normal  
use and service, for a period of one year or 2000 hours after the  
date of delivery to the original retail purchaser.The Manufacturer  
will, at its option, replace or repair at a point designated by  
Manufacturer any part or parts which shall appear to the  
satisfaction of Manufacturer upon inspection at such point to  
have been defective in material or workmanship.This warranty  
does not obligate Manufacturer to bear any transportation  
charges or labor charges in connection with the replacement or  
repair of the defective parts.  
This warranty does not apply to any pump if attempts have  
been made to pump concrete materials which have separated,  
to any pump which has been repaired with other than Genuine  
Mayco Parts, nor to any pump which has been altered, repaired  
or used in such manner as to adversely affect its performance,  
nor to normal service or maintenance or where blockages have  
developed within the pump manifold or placing line or which  
has been operated in any other manner not recommended by  
the Manufacturer.Due to the abrasive nature of concrete, Mayco  
does not cover natural component wear.  
This warranty does not apply to any pump if attempts have  
been made to pump concrete materials which have separated,  
to any pump which has been repaired with other than Genuine  
Mayco Parts, nor to any pump which has been altered, repaired  
or used in such manner as to adversely affect it’s performance,  
nor to normal service or maintenance or where blockages have  
developed within the pump manifold or placing line or which  
has been operated in any other manner not recommended by  
the Manufacturer.Due to the abrasive nature of concrete, Mayco  
does not cover natural component wear.  
THIS WARRANTY AND MANUFACTURER’S OBLIGATION  
HEREUNDER, IS IN LIEU OF ALL OTHER WARRANTIES,  
EXPRESS, IMPLIED OR STATUTORY AND ALL OTHER  
OBLIGATIONS OR LIABILITIES INCLUDING SPECIAL OR  
CONSEQUENTIAL DAMAGES OR CONTINGENT  
LIABILITIES ARISING OUT OFTHE FAILURE OF ANY PUMP  
OR PART TO OPERATE PROPERLY, INCLUDING ANY  
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A  
PARTICULAR PURPOSE.  
THIS WARRANTY AND MANUFACTURER’S OBLIGATION  
HEREUNDER, IS IN LIEU OF ALL OTHER WARRANTIES,  
EXPRESS, IMPLIED OR STATUTORY AND ALL OTHER  
OBLIGATIONS OR LIABILITIES INCLUDING SPECIAL OR  
CONSEQUENTIAL DAMAGES OR CONTINGENT  
LIABILITIES ARISING OUT OFTHE FAILURE OF ANY PUMP  
OR PART TO OPERATE PROPERLY, INCLUDING ANY  
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A  
PARTICULAR PURPOSE.  
MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 131  
Download from Www.Somanuals.com. All Manuals Search And Download.  
OPERATIONS & PARTS MANUAL  
HERE'S HOW TO GET HELP  
PLEASE HAVETHE MODEL AND SERIAL  
NUMBER ON-HANDWHEN CALLING  
MULTIQUIP CORPORATE OFFICE  
18910 Wilmington Ave.  
Carson, CA 90746  
800-421-1244  
FAX:310-537-3927  
Email: mq@multiquip.com  
Internet:www.multiquip.com  
PARTS DEPARTMENT  
800-427-1244  
310-537-3700  
FAX:800-672-7877  
FAX:310-637-3284  
MAYCO PARTS  
800-306-2926  
310-537-3700  
FAX:800-672-7877  
FAX:310-637-3284  
SERVICE DEPARTMENT  
800-421-1244  
FAX:310-537-4259  
310-537-3700  
TECHNICAL ASSISTANCE  
800-478-1244  
FAX:310-631-5032  
FAX:310-537-1173  
WARRANTYDEPARTMENT  
800-421-1244,EXT.279  
310-537-3700,EXT.279  
Your Local Dealer is:  
MULTIQUIP INC.  
18910WILMINGTONAVE.  
CARSON, CALIFORNIA 90746  
800-421-1244 • 310-537-3700  
FAX:310-537-3927  
E-mail:mq@multiquip.com  
Internet:multiquip.com  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Mustang Survival Life Jacket MD3183 User Manual
Nady Systems Microphone UHF 10 User Manual
Network Technologies Switch ST C5KVM 600 CE User Manual
NuTone Child Tracker LA 228WH User Manual
NuTone Ventilation Hood NP60000 User Manual
OPTI UPS Switch AS KEXT180 User Manual
Oregon Scientific Weather Radio BA2000 User Manual
Palsonic Flat Panel Television TFTV665UBK User Manual
Panasonic Camera Accessories HF008 User Manual
Pass Labs Stereo Amplifier X3505 User Manual