Walker Lawn Mower MDD User Manual
OWNER’S MANUAL  
Safety, Assembly, Operating, and Maintenance Instructions  
Model MDD (20.9 HP Diesel)  
™
Please Read and Save These Instructions  
For Safety, Read All Safety and Operation  
Instructions Prior to Operating Machine  
Effective Date: 02-15-05  
P/N 7000-8  
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Table of Contents  
General Information ________________ 1  
Operating Instructions_____________ 25  
HIGHLIGHTED INFORMATION _____________ 1  
GLOSSARY ____________________________ 1  
IDENTIFYING NUMBER LOCATIONS________ 1  
ENGINE SERIAL NUMBER LOCATION ______ 2  
SERVICING OF ENGINE AND  
CONTROL IDENTIFICATION,  
LOCATION, AND FUNCTION _____________ 25  
Operating Controls ___________________ 25  
Engine Throttle ______________________ 25  
Forward Speed Control (FSC) __________ 26  
Steering Levers ______________________ 26  
Blade Clutch (PTO) ___________________ 26  
Parking Brake _______________________ 26  
Front Body Latch Release _____________ 26  
Transmission Lockout Levers __________ 27  
Cold Start Lever  
(Jackshaft Drive Belt Release) _________ 27  
Instrument Panel _____________________ 29  
Voltmeter ___________________________ 30  
Water Temperature Gauge _____________ 30  
Oil Pressure Warning Light ____________ 30  
Water Temperature Warning Light_______ 30  
Ignition Switch _______________________ 30  
Light Switch (For Optional Lights)_______ 31  
Hourmeter __________________________ 31  
Circuit Breakers______________________ 31  
Warning Horn________________________ 31  
STARTING THE ENGINE_________________ 31  
ADJUSTING GROUND  
DRIVETRAIN COMPONENTS ______________ 2  
Specifications________________________ 3  
ENGINE________________________________ 3  
ELECTRICAL SYSTEM ___________________ 3  
TRANSMISSION_________________________ 3  
BLADE DRIVE __________________________ 4  
TIRE SIZE ______________________________ 4  
TIRE PRESSURE ________________________ 4  
DIMENSIONS (Tractor and Mower) _________ 5  
MOWER DECK__________________________ 5  
CURB WEIGHT (Approximate) _____________ 5  
DRIVE BELTS___________________________ 6  
GHS SYSTEM (Optional)__________________ 6  
SEAT__________________________________ 6  
FRAME/BODY CONSTRUCTION ___________ 6  
Component Identification___________ 7  
Safety Instructions _________________ 11  
SPEED AND STEERING _________________ 33  
ENGAGING THE MOWER________________ 34  
STOPPING THE MACHINE _______________ 35  
ADJUSTING CUTTING HEIGHT ___________ 35  
TRANSMISSION LOCKOUT ______________ 36  
RECOMMENDATIONS FOR MOWING ______ 37  
RECOMMENDATIONS FOR TILT-UP DECK  
OPERATION/TRANSPORT _______________ 38  
GRASS HANDLING SYSTEM (GHS) _______ 39  
General Information __________________ 40  
Clogging Checklist ___________________ 41  
Using the Tilt-Up Deck ________________ 42  
Using the GHS Catcher________________ 42  
Powerfil ® _________________________ 42  
“Full” Signal Horn ___________________ 42  
Cleaning the GHS Exhaust Screen ______ 42  
Dumping the Catcher _________________ 43  
Tailgate Dumping ___________________ 43  
Using the Dump Bag _________________ 43  
Power Dump Option _________________ 44  
BEFORE OPERATING___________________ 11  
OPERATING___________________________ 12  
MAINTENANCE ________________________ 14  
SAFETY, CONTROL, AND  
INSTRUCTION DECALS _________________ 15  
Assembly Instructions _____________ 17  
SETUP INSTRUCTIONS _________________ 17  
Tire Installation (Tractor)_______________ 17  
Battery Service_______________________ 17  
Wet Battery Service __________________ 17  
Dry Battery Service __________________ 17  
Battery Charging ____________________ 18  
Battery Installation ___________________ 18  
Mower Deck Assembly ________________ 18  
Deck Caster Wheels Installation ________ 18  
Deck Discharge Chute Installation ______ 19  
Deck Discharge Shield Installation ______ 19  
PTO Shaft Guard Installation __________ 19  
Tilt-Up Roller Wheel Installation ________ 19  
Mower Deck Installation on Tractor ______ 20  
Deck Installation ____________________ 20  
Deck Leveling ______________________ 22  
PREOPERATING CHECKLIST ____________ 23  
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Table of Contents  
REPLACING/REPAIRING ________________ 64  
Drive Belts __________________________ 64  
Engine PTO Drive Belt _______________ 65  
Jackshaft Drive Belt _________________ 66  
GHS Blower Drive Belt _______________ 67  
Hydrostatic Ground Drive Belt _________ 68  
Engine Fan Belt ____________________ 69  
Fuel Filter ___________________________ 70  
Blade Overload Shear Bolts ____________ 70  
PTO Shear Pin _______________________ 71  
Mower Blades _______________________ 71  
ADJUSTMENTS________________________ 72  
Steering Levers ______________________ 72  
Tilt-Up Deck Adjustable Stop ___________ 72  
GHS Signal Horn Adjustment  
Maintenance Instructions__________ 46  
MAINTENANCE SCHEDULE CHART _______ 46  
IMPORTANT TIPS FOR CARE  
OF THE KUBOTA ENGINE _______________ 47  
Fuel System _________________________ 47  
Starting/Stopping_____________________ 47  
Cooling System ______________________ 47  
Air Cleaner System ___________________ 47  
Oil _________________________________ 47  
LUBRICATION _________________________ 48  
Engine Oil ___________________________ 48  
Engine Break-In Oil __________________ 48  
Checking Engine Crankcase Oil Level ___ 48  
Changing Engine Crankcase Oil/Oil Filter _ 48  
Grease Fitting and Oil Point Lubrication __ 49  
Mower Deck Gearbox Lubrication _______ 52  
DSD52 or DSD62  
Mower Deck Lubrication _______________ 52  
Tractor PTO Gearbox Lubrication _______ 53  
Checking Gearbox Oil Level ___________ 53  
Changing Gearbox Oil ________________ 53  
Gear Axle Lubrication _________________ 53  
Hydrostatic Transmission Fluid _________ 54  
Checking Hydrostatic  
(When Horn Sounds at Wrong Time)_____ 72  
Maintenance And Service  
Record Sheet_______________________ 74  
Warranty___________________________ 75  
Transmission Fluid Level ______________ 54  
CLEANING ____________________________ 55  
Engine Air Cleaner System _____________ 55  
Turbine Precleaner __________________ 55  
Donaldson Radialseal™ Air Cleaner _____ 56  
Engine Cooling System________________ 57  
Radiator Screen and Cooling Fins ______ 57  
Flushing Radiator and Changing Coolant _ 58  
Grass Buildup in Mower Housing________ 58  
GHS Blower _________________________ 59  
GHS Exhaust Screen __________________ 59  
Hydrostatic Transmission Cooling Fins __ 59  
CHECKING/SERVICING _________________ 60  
Engine Cooling System________________ 60  
Coolant Level ______________________ 60  
Fan Belt Tension ____________________ 60  
Security of Air Filtration Components ____ 61  
Battery______________________________ 61  
Electrolyte Level ____________________ 61  
Cleaning the Terminals _______________ 61  
Charging the Battery _________________ 61  
Tire Pressure ________________________ 61  
Sharpen Mower Blades ________________ 62  
Drive Belts __________________________ 63  
Mower Deck Gearbox Oil Seals _________ 63  
Fuel Lines and Clamps ________________ 63  
Radiator Hoses and Clamps ____________ 63  
Blade Brake Action ___________________ 63  
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General Information  
HIGHLIGHTED INFORMATION  
•
•
POWER TAKE-OFF (PTO) transmits engine  
power to run the cutter blades and GHS blower.  
Walker Manufacturing recommends that any ser-  
vice requiring special training or tools be performed  
by an authorized Walker Mower Dealer. There are  
several general practices to be aware of in the area  
of safety. Most accidents associated with the oper-  
ation or maintenance of a Walker Mower are  
caused by disregarding basic safety precautions or  
specific warnings. Such accidents, in most cases,  
can be prevented by being aware of the dangers  
present.  
POWERFIL spreads the mowed material  
throughout the interior of the grass catcher by  
an oscillating delivery spout.  
•
RIGHT HAND (RH) refers to the right-hand side  
of the tractor when the operator is seated facing  
forward in the tractor seat.  
•
•
•
SIDE DISCHARGE (SD) mows but does not  
collect the mowed material.  
Information of special importance has been high-  
lighted in bold type in this manual. Refer to Safety  
Instructions for the meanings of DANGER, WARN-  
ING, CAUTION, IMPORTANT, and NOTE.  
STEERING LEVERS steer the tractor by con-  
trolling the dual hydrostatic transmissions.  
TRACTOR is the prime mover, including the en-  
gine, drive train, operator seat, and controls to  
operate the mower.  
GLOSSARY  
There are many terms that are either unique to this  
equipment or that are used as acronyms. The fol-  
lowing terms and their definitions will help while  
using this manual:  
•
TRANSMISSION LOCKOUT releases the hy-  
drostatic transmissions to permit freewheeling  
the tractor.  
IDENTIFYING NUMBER LOCATIONS  
•
DECK is the mowing attachment mounted on  
the front of the tractor which includes the carrier  
frame, deck housing, blade drive gearboxes,  
and cutter blades.  
The tractor serial number plate is affixed to the trac-  
tor body just below the left rear corner of the seat.  
The mower deck serial number plate is affixed  
alongside the angle iron framing on the LH side of  
the LH mower blade drive. Model and serial num-  
bers are helpful when obtaining replacement parts  
and maintenance assistance. For ready reference,  
please record these numbers in the space provided.  
•
FORWARD SPEED CONTROL (FSC) controls  
the maximum forward speed of the tractor;  
functioning as a cruise control.  
•
•
GRASS HANDLING SYSTEM (GHS ) collects  
mowed material and deposits it in the catcher.  
Tractor Model No. _______________________  
Tractor Serial No. _______________________  
GRASS-PAK SWITCH is mounted on the  
grass delivery spout (in the catcher) and acti-  
vates the “full” signal horn when the grass  
catcher is full.  
Deck Serial No.  
_______________________  
•
•
GROUND DRIVE refers to the dual hydrostatic  
transmissions which drive the main wheels.  
Engine Model No. _______________________  
Engine Serial No. _______________________  
Date of Purchase _______________________  
HYDROSTATIC TRANSMISSION transmits  
and controls power from the ground drive belt to  
the main drive wheel.  
•
LEFT HAND (LH) refers to the left-hand side of  
the tractor when the operator is seated facing  
forward in the tractor seat.  
Fill In By Purchaser  
1
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General Information  
SERVICING OF ENGINE AND DRIVETRAIN  
COMPONENTS  
Serial Number  
The detailed servicing and repair of the engine,  
hydrostatic transmission, and gearboxes are not  
covered in this manual. Only routine maintenance  
and general service instructions are provided. For  
the service of these components during the limited  
warranty period, it is important to find a local,  
authorized servicing agent of the component manu-  
facturer. Any unauthorized work done on these  
components during the warranty period may void  
the warranty. If you have any difficulty finding an  
authorized outlet or obtaining warranty service,  
please contact our Service Department for assis-  
tance:  
Tractor Serial Number Location  
Walker Manufacturing Company  
5925 E. Harmony Road  
Fort Collins, CO 80528  
1-970-221-5614  
Serial Number  
Service manuals are available for each of these  
components from their respective manufacturers as  
follows:  
Kubota Engines  
Kubota Tractor Corp.  
1300 Remington Road  
Schaumburg, IL 60173  
Mower Deck Serial Number Location  
ENGINE SERIAL NUMBER LOCATION  
Hydrostatic  
Transmissions  
Eaton Corporation  
15151 Highway 5  
Eden Prairie, MN 55344  
Refer to the engine manual that accompanies this  
manual for the location of the engine serial number.  
For the mower model covered by this manual, an en-  
gine manual is available covering the Kubota D722  
diesel engine (liquid cooled).  
Gearboxes (Deck)  
Tecumseh Products Co.  
900 North Street  
Grafton, Wl 53024  
Serial Number  
Engine Serial Number Location  
2
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Specifications  
MDD  
MODEL  
ENGINE  
Manufacturer/Model  
Displacement  
Kubota D722, 3 Cyl., Diesel (Liquid Cooled)  
44.0 cu. in. (722 cc)  
HP (@ 3600 RPM)  
Max. RPM (No Load)  
Governed RPM  
20.9  
3800  
3600  
Max. Torque [ft-lb (N·m) @ RPM]  
Idle RPM  
34 (46.1) @ 2600  
1000 ± 50  
N/A  
Spark Plug Type  
Spark Plug Gap  
N/A  
Crankcase Capacity  
Crankcase Lubricant  
3.1 qts (2.9 liters)  
API CC/CD/CE Grade Oil Only with 10W-30 Viscosity or 30W  
above 77° F (25° C) Only  
Fuel Tank Capacity  
Fuel  
5 Gallons (19 liters)  
Diesel Fuel 2-D  
Cooling System Capacity  
(Approx.)  
1.25 Gallon (4.74 liters)  
Cooling Fan  
Coolant  
Electric radiator cooling fan with reversible self-cleaning action  
50/50 Pre-Mix Antifreeze/Water  
ELECTRICAL SYSTEM  
Battery  
12 Volt, 41AH, 340 CCA  
(Interstate U1-SP40)  
Charging System  
Charging Output  
System Polarity  
Ignition  
Automotive Type Alternator  
12.5 Amp DC (Regulated)  
Negative Ground  
Diesel with Glow Plugs  
Starter  
12 Volt Electric Ring-Gear Type, Solenoid Shift  
Interlock Switch  
Ignition Lockout by Seat Switch, Transmission Neutral and Blade  
Clutch  
Circuit Breaker  
Manual Reset (40A)  
TRANSMISSION  
Manufacturer/Model  
Dual Hydrostatic, Eaton Model 7, Each Wheel Independently  
Driven  
Steering  
Hand Lever Control / Individual Wheel  
Forward Speed Control  
Precision Friction Lock Lever, Cruise Control, with Neutral-Park  
Position  
3
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Specifications  
MDD  
MODEL  
TRANSMISSION (continued)  
Service Brake  
Parking Brake  
Neutral  
Dynamic Braking through Hydrostatic Transmission  
Mechanical Pin Lock in Transmission Gear  
Transmission Release by Manual Dump Valve  
Gear Drive Axle  
Final Drive  
Transmission Fluid  
Factory Service  
Mobil 1 Synthetic Motor Oil (15W50)  
SAE 30W Straight Viscosity Motor Oil  
1 qt (1 liter)  
Alternate Transmission Fluid  
Transmission Fluid Capacity  
Transmission Cooling  
Cooling Fan Mounted on Drive Pulley  
Ground Travel Speed  
Forward m.p.h. (km/h)  
Reverse m.p.h. (km/h)  
0-5 (0-8) Infinitely Variable  
0-5 (0-8) Infinitely Variable  
BLADE DRIVE  
PTO Shaft  
Quick Disconnect Spline Shaft with Two High-Speed  
U-Joints  
Blade Spindle  
Each Blade (2) Mounts Direct on Peerless Right Angle Gearbox  
with Tee Gearbox in Center Connected to PTO Shaft (Complete  
Geared Drive, Peerless Model 1000 Gearboxes)  
Blade Drive Clutch and Brake  
Manual Belt Tightener Clutch and Band Brake (Stops Blades  
within Five (5) Seconds of Disengagement)  
Max. Blade Speed  
2900 RPM [16700 FPM (5090 m/min)]  
[25 in. (64 cm) Blade]  
@ 3600 RPM Engine  
TIRE SIZE  
Deck Caster Wheel  
Deck Caster Wheel (Optional)  
Drive  
2.80/2.50-4 Pneumatic (4-Ply)  
8.25 x 2.75 Semi-Pneumatic  
18 x 9.50-8 (4-Ply)  
Rear (Dual)  
13 x 5.00-6 (4-Ply)  
TIRE PRESSURE  
Deck Caster Wheel  
20 PSI (137 kPa)  
15 PSI (103 kPa)  
20 PSI (137 kPa)  
Drive  
Rear  
4
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Specifications  
MDD  
MODEL  
DIMENSIONS (Tractor and Mower)*  
Length  
91 in. (231 cm)  
49 in. (124 cm)  
44 in. (112 cm)  
42-1/4 in. (107 cm)  
29-3/4 in. (76 cm)  
Width  
Height  
Wheel Base (Tractor)  
Tread Width (Tractor)  
MOWER DECK  
Width of Cut SD/GHS  
Cutting Height  
42 or 48 in. (107 or 122 cm)  
1 to 4 in. (3 to 10 cm)  
Height Adjustment  
7 Positions - 1/2 in. (1 cm) Increment Hitch Pins Installed in  
Multi-Position Deck Support  
Blade Size (Typical)  
42 in. (107 cm) SD  
22 in. (56 cm)  
2 in. (5 cm) Center Overlap  
(Two Blades, CW Rotation)  
48 in. (122 cm) GHS  
Deck Suspension  
25 in. (64 cm)  
2 in. (5 cm) Center Overlap  
(Two Blades, Counter Rotate)  
Torsion-Flex Frame with Caster Wheels and Counterweight  
Springs  
CURB WEIGHT (Approximate)  
SD Tractor Only  
760 lb (345 kg)  
850 lb (386 kg)  
1020 lb (463 kg)  
GHS Tractor Only  
Tractor and Mower*  
*Dimensions and weight shown are for 48 in. (122 cm) GHS Model (typical).  
Dimensions for Tractor and Mower with 42 in. (107 cm) deck are:  
Length = 88 in. (224 cm)  
Width = 43 in. (110 cm)  
For SD Models, subtract 7 in. (18 cm) from the height.  
Deck weight for 48 in. (122 cm) Tilt-Up deck = 205 lb (93 kg). Deck sizes range from 42 to 72 in.  
(107 to 183 cm), with corresponding deck weights ranging from 170 to 400 lb (77 to 181 kg).  
Optional (9.5 Bushel) Grass Catcher adds approx. 5 lb (2 kg) and 5 in. (13 cm) in Height  
5
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Specifications  
MDD  
MODEL  
DRIVE BELTS  
Engine PTO  
Walker P/N 7230  
Jackshaft Drive  
Ground Drive  
Blower (GHS Model)  
Gates 3VX355 (P/N 6231)  
Walker P/N 7248  
Gates 3VX280 (P/N 7234-1)  
GHS SYSTEM (Optional)  
Blower  
4 x 10 x 1/4 in. (10 x 25 x 1 cm) Three-Blade Paddle Wheel (Driven  
by Mower Engine)  
Blower Brake  
Band Brake (Works in Combination with PTO Clutch, Stops Blower  
within Five (5) Seconds of PTO Disengagement)  
Max. Blower Speed  
3600 RPM  
Grass Catcher Capacity  
Optional Grass Catcher Capacity  
Full Signal  
65 Gallons (246 liters)/7.0 Bushels  
89 Gallons (335 liters)/9.5 Bushels  
Oscillating Vane Switch Mounted on Grass Delivery Spout  
Triggers Horn Signal  
Powerfil ®  
Oscillating Delivery Spout Driven by 12 Volt Electric Gearmotor  
Spreads Material throughout Interior of Catcher @ 25 Cycles/  
Minute  
SEAT  
Contour-Molded, with Nylon Backed Vinyl Cover and Integral  
Foam Cushion  
FRAME/BODY CONSTRUCTION  
Frame  
All Welded Unitized Steel Chassis  
14 Gauge Steel  
Body  
Deck  
11 Gauge Steel  
GHS Catcher and Chutes  
Molded Cross-Linked Polyethylene (UV Stabilized)  
NOTE: The manufacturer reserves the right to make changes in specifications shown herein at any time  
without notice or obligation.  
6
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Component Identification  
NOTE: Control Identification  
shown in Operating  
Instructions section.  
Catcher Door  
Safety Latch  
Turbine  
Precleaner  
Grass Handling System  
9.5 Bushel Catcher  
Tilt-Up  
Latch  
Spring Clip  
Counterweight Spring  
and Protective Cover  
Transmission Control Rod  
Adjustment Nut (LH)  
Deck Support Pins  
and Height Adjustment  
Hitch Pins  
Anti-Scuff  
Roller  
Catcher Lift /  
Dump Handle  
Tilt-Up  
Deck Handle  
Fuel Tank and Cap  
Transmission Control Rod  
Adjustment Nut (RH)  
Deck Support Arms  
Footrests  
Deck Lift Handle  
(Cutting Height Adjustment)  
Tilt-Up Hook  
Deck Caster Wheels  
Front View and Right Side View  
7
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Component Identification  
Catcher Door Gas  
Spring Protective Cover  
Removable Grass  
Catcher Screen  
(Not Visible)  
Catcher Door  
Gas Spring  
Catcher Exhaust  
Deflector  
Radiator Cap  
Radiator  
Catcher Lift /  
Dump Handle  
Instrument Panel  
Guard  
Catcher  
Door  
Instrument Panel Box  
(Shock Mounted)  
Catcher  
Door Handle  
Dump Plate  
Fuel  
Filter  
Anti-Scuff  
Roller  
Muffler and  
Tailpipe  
Radiator  
Guard  
Left Hand  
Drive Wheel  
Coolant  
Recovery Tank  
Radiator  
Screen  
Tailwheel Fork  
and Wheel  
Rear View and Left Side View  
8
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Component Identification  
Muffler  
Donaldson  
Air Cleaner  
Air Cleaner  
Cover  
Tailpipe  
Overflow Hose  
Radiator Cap  
Air Restriction Indicator  
Radiator  
Precleaner Tube  
Jackshaft  
Radiator  
Guard  
PTO Gearbox  
Dipstick  
GHS Blower  
Turbine  
Precleaner  
RH Hydrostatic  
Transmission  
RH Transmission  
Lockout Lever  
40 Amp  
Circuit Breaker  
Neutral Safety  
Switch  
PTO  
Clutch Lever  
LH Transmission  
Lockout Lever  
30 Amp  
Circuit Breaker  
Positive (+)  
Battery Cable  
LH Hydrostatic  
Transmission  
Battery  
Negative (-)  
Battery Cable  
Top View (Engine Compartment)  
9
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Component Identification  
Water Temperature  
Gauge Sender  
Exhaust  
Manifold  
Starter Motor Below  
(Not Visible)  
Oil Fill  
Cap  
Alternator  
Thermostat Housing  
and Thermostat  
Glow Plug(s)  
Water Pump  
Fan Motor  
Fuel Pickup  
Line  
Fuel Return  
Line  
Radiator Screen  
(Removable)  
Fuel Tank  
Cap  
Radiator Fan  
and Shield  
Throttle Control  
Linkage Lever  
Engine Stop Lever Linkage  
(Fuel Shut-Off Valve)  
Injection  
Pump  
Air Intake  
Injectors  
Hose  
Top View (Engine Compartment)  
10  
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Safety Instructions  
Pay particular attention to any information labeled  
DANGER, WARNING, CAUTION, IMPORTANT,  
and NOTE in this manual.  
Walker Manufacturing cannot predict every poten-  
tially dangerous situation. Therefore, items labeled  
as such in this manual do not cover all conceivable  
situations. Any person using procedures, tools, or  
control techniques not recommended by Walker  
Manufacturing must take full responsibility for safety.  
When you see the Safety Alert Symbol (  
),  
read, understand, and follow the instructions. Fail-  
ure to comply with safety instructions may result in  
personal injury.  
The Walker Rider Lawnmower has been designed  
with many safety features to protect the operator  
from personal harm or injury. However, it is neces-  
sary for the operator to use safe operating proce-  
dures at all times. Failure to follow safety  
instructions contained in this manual may re-  
sult in personal injury or damage to equipment  
or property.  
The seriousness or degree of importance of each  
type of information is defined as follows:  
DANGER  
An IMMEDIATE hazard that WILL result in  
severe personal injury or DEATH, if warn-  
ing is ignored and proper safety precau-  
tions are not taken.  
If you have any questions concerning setup, opera-  
tion, maintenance, or safety, please contact your  
authorized Walker Mower Dealer or call Walker  
Manufacturing Company at (970) 221-5614.  
BEFORE OPERATING  
WARNING  
1. Read and understand the contents of this  
Owner’s Manual before starting and operat-  
ing the machine. Become thoroughly familiar  
with all machine controls and how to stop the  
machine and disengage the controls quickly.  
Replacement Owner’s Manuals are available  
by sending the Model and Serial Number to:  
A POTENTIAL hazard that COULD result in  
severe personal injury or DEATH, if warn-  
ing is ignored and proper safety precau-  
tions are not taken.  
Walker Manufacturing Company  
5925 East Harmony Road  
Fort Collins, CO 80528  
CAUTION  
Possible hazards or unsafe practices that  
MAY result in MODERATE personal injury  
or property damage, or machine damage, if  
warning is ignored and proper safety pre-  
cautions are not taken.  
2. Never allow children to operate rider mower.  
Do not allow adults to operate without proper  
instruction.  
3. Clear the area to be mowed of any foreign  
objects which may be picked up and thrown by  
cutter blades. Pick up all sticks, stones, wire,  
and any other debris.  
IMPORTANT: Identifies mechanical information  
demanding special attention, since it deals with the  
possibility of damaging a part or parts of the ma-  
chine.  
4. Keep everyone, especially children and pets, a  
safe distance away from the area being mowed.  
Do not mow with bystanders in the area.  
5. Do not operate the machine barefoot or wearing  
sandals, sneakers, tennis shoes, or similar light-  
weight footwear. Wear substantial protective  
footwear.  
NOTE: Identifies information worthy of special at-  
tention.  
11  
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Safety Instructions  
6. Do not wear loose fitting clothing that could get  
caught in moving parts. Do not operate this  
machine while wearing shorts; always wear  
adequate protective clothing, including long  
pants. Wearing safety glasses, safety shoes,  
and a helmet is advisable and required by some  
local ordinances and insurance regulations.  
12. The electrical system battery contains sulfuric  
acid. Avoid any contact with skin, eyes, and  
clothing. Keep the battery and acid out of reach  
of children.  
OPERATING  
1. Operate the mower only in daylight or in  
good artificial light with good visibility of the area  
being mowed.  
7. Prolonged exposure to loud noise can cause im-  
pairment or loss of hearing. Operator hearing  
protection is recommended; particularly for  
continuous operation of the GHS Model due to  
blower noise level. Wear a suitable hearing pro-  
tective device, such as earmuffs or earplugs.  
2. Sit on the seat when starting the engine and  
operating the machine. Keep feet on the deck  
footrests at all times when the tractor is moving  
and/or mower blades are operating.  
8. Keep all protective shields and safety de-  
vices in place. If a protective shield, safety  
device, or decal is damaged, unusable, or miss-  
ing, repair or replace it before operating the ma-  
chine.  
3. For a beginning operator, learn to steer (ma-  
neuver) the tractor with a slow engine speed  
before attempting any mowing operation.  
Be aware that, with the front mounted mower  
configuration, the back of the tractor swings to  
the outside during turns.  
9. Be sure interlock switches are functioning  
correctly, so the engine cannot be started un-  
less the Forward Speed Control lever is in the  
NEUTRAL-PARK position, and the PTO clutch  
is in the DISENGAGED position. Also, the en-  
gine should stop if the operator lifts off the seat  
with the PTO clutch in the ENGAGED position.  
4. Remember, for an emergency stop, the forward  
motion of the tractor can always be stopped by  
pulling the Forward Speed Control (FSC) into  
the NEUTRAL-PARK position.  
5. In case either of the transmission drive belts  
break during operation, and if the machine is on  
a slope, the machine will freewheel down the  
slope. To maintain control, immediately (1)  
Release the steering levers and simultaneously  
(2) Move the FSC to the NEUTRAL-PARK posi-  
tion. When the machine is stopped or moving  
slowly, engage the parking brake.  
10. Handle diesel fuel with care:  
a. Use an approved fuel container.  
b. Never add fuel to a running engine or hot  
engine (allow hot engine to cool several  
minutes).  
NOTE: This is exactly the same procedure used  
to normally stop and park the machine.  
c. Keep matches, cigarettes, cigars, pipes,  
open flames, or sparks away from the fuel  
tank and fuel container.  
6. Disengage the blade clutch and put the FSC in  
the NEUTRAL-PARK position before starting  
the engine (an ignition interlock switch normally  
prevents starting of the machine if these con-  
trols are in the OPERATING position).  
d. Always fill the fuel tank outdoors using care.  
Filltoaboutoneinchfromthetopofthetank.  
Use a funnel or spout to prevent spilling.  
e. Replace the machine fuelcapandcontainer  
cap securely and clean up any spilled fuel  
before starting the engine.  
7. Do not run the engine in a confined area  
without adequate ventilation. Exhaust fumes  
are hazardous and can be deadly.  
11. Never attempt to make any adjustments  
while the engine is running, except where  
specifically instructed to do so.  
8. Do not carry passengers - maximum seating  
capacity is one (1) person.  
12  
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Safety Instructions  
9. Watch for holes, rocks, and roots in the terrain  
and for other hidden hazards. When mowing  
tall grass, mow higher than desired to expose  
any hidden obstacles. Then, clean the area  
and mow to the desired height.  
17. For GHS equipped models, use care when  
closing the grass catcher door. Keep fingers  
and hands away from the hinge and pinch  
points when the door is being closed. Also,  
keep fingers and hands clear of the door frame.  
The door is held closed with springs and the  
door may slam shut with considerable force.  
10. Avoid sudden starts or stops. Before backing  
the machine up, look to the rear to be sure no  
one is behind the machine. Watch carefully for  
traffic when crossing or working near roadways.  
18. In case of a clogged or plugged mower deck  
or GHS catching system:  
11. Disengage the blade drive when transporting  
the machine across drives, sidewalks, etc. Ne-  
ver raise the mower deck while blades are  
rotating.  
a. Disengage the blade clutch (PTO) and turn  
the engine off before leaving the seat.  
b. LOOK to make sure blade drive shaft and  
blower drive pulley movement has stopped  
before trying to unclog the system.  
12. The maximum recommended side slope op-  
erating angle is 20 degrees or 33% grade.  
When operating the machine on a slope, reduce  
speed and use caution to start, stop, and ma-  
neuver. To prevent tipping or loss of control of  
the machine, avoid sharp turns or sudden  
changes in direction.  
c. Disconnect the electrical plug on the fuel  
shut-off solenoid.  
d. Never place hands under the deck or in the  
GHS blower - use a stick or similar tool to  
remove clogged material.  
13. Never adjust cutting height with the engine  
running. Before adjusting cutting height or  
servicing, disengage the blade clutch (PTO),  
stop the engine, and remove the ignition key.  
Wait for all movement to stop before getting off  
the seat.  
19. If the cutting blades strike a solid object or the  
machine begins to vibrate abnormally, immedi-  
ately disengage the blade clutch (PTO), stop  
the engine, and wait for all moving parts to  
stop. To prevent accidental starting, discon-  
nect the electrical plug on the fuel shut-off sole-  
noid. Thoroughly inspect the mower and repair  
any damage before restarting the engine and  
operating the mower. Make sure cutter blades  
are in good condition and blade nuts are  
torqued to 60 ft-lb (81.3 N·m).  
NOTE: A blade/blower brake should normally  
stop drive line rotation within five (5) seconds of  
disengaging the PTO clutch.  
14. For side discharge mower decks, do not oper-  
ate with the grass deflector chute removed.  
Keep the deflector in the lowest possible posi-  
tion.  
20. Do not touch the engine or muffler while the  
engine is running or immediately after stop-  
ping the engine. These areas may be hot  
enough to cause serious burns.  
15. For tractors equipped with tilt-up deck, observe  
the following recommendations:  
21. Never remove the radiator pressure cap  
when the engine is hot (hot water may spray  
and cause burns).  
a. Do not move tractor with deck in tilt-up po-  
sition.  
b. Never tilt body forward with deck in tilt-up  
position.  
22. Do not use ether or any starting fluid to assist  
starting the engine in cold weather.  
16. For GHS equipped models, do not operate the  
machine with the grass catcher in the DUMP  
position or with the back door OPEN. Dan-  
gerous projectiles may be thrown out of the dis-  
charge chute or the back of the grass catcher.  
23. When leaving the machine unattended, dis-  
engage the blade clutch (PTO), stop the en-  
gine, and remove the key.  
13  
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Safety Instructions  
MAINTENANCE  
11. Use genuine factory replacement parts.  
Substitute parts may result in product malfunc-  
tion and possible injury to the operator and/or  
others.  
1. To prevent accidental starting of the engine  
when servicing or adjusting the machine, re-  
move the key from the ignition switch and dis-  
connect the electrical plug on the fuel shut-off  
solenoid.  
12. Use care when charging the battery or per-  
forming maintenance on the battery and electri-  
cal system:  
2. To reduce fire hazards, keep the engine free of  
grass, leaves, excessive grease, and dirt.  
a. Make sure the battery charger is unplugged  
before connecting or disconnecting cables  
to the battery.  
3. Keep all nuts, bolts, and screws tight to ensure  
the machine is in a safe, working condition.  
Check the blade mounting nuts frequently, mak-  
ing sure they are tight.  
b. Charge the battery in a well-ventilated  
space, so gases produced while charging  
can dissipate. Make sure the battery vents  
in the caps are open.  
4. Perform only maintenance instructions de-  
scribed in this manual. Unauthorized main-  
tenance operations or machine modifications  
may result in unsafe operating conditions.  
c. Keep sparks, flames, and smoking materi-  
als away from the battery at all times. To  
avoid sparks, use care when removing bat-  
tery cables from posts.  
5. If the engine must be running to perform a main-  
tenance adjustment, keep hands, feet, and  
clothing away from moving parts. Do not wear  
jewelry or loose clothing.  
d. Disconnect both battery cables before  
unplugging any wiring connectors or mak-  
ing repairs on the electrical system.  
6. Always use the proper engine service man-  
ual when working on the engine. Unautho-  
rized maintenance operations or modifications  
to the engine may result in unsafe operating  
conditions.  
IMPORTANT: Keep all applicable manuals  
immediately accessible to anyone who may  
operate or service this machine.  
7. The fuel oil injection system operates under  
high pressure and can penetrate the skin and  
result in serious injury. Unqualified persons  
should not remove or attempt to adjust a pump  
injector, nozzle, or any part of the fuel injection  
system.  
8. Altering the equipment or engine in any manner  
which adversely affects its operation, perfor-  
mance, durability, or use will VOID the warran-  
ty and may cause hazardous conditions.  
9. Never attempt to disconnect any safety devices  
or defeat the purpose of these safety devices.  
10. Do not change the engine governor settings or  
overspeed the engine. The governor has been  
factory-set for maximum-safe engine operating  
speed.  
14  
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Safety Instructions  
SAFETY, CONTROL, AND INSTRUCTION DECALS  
Safety, Control, and Instruction Decals are installed on the machine;  
if any are missing, illegible, or damaged, a replacement should be ordered and installed before  
putting the machine into operation. The Decal Part Number is listed below and in the Parts Manual.  
Adjacent to Blower Discharge Chute  
Each End of Mower Deck (5808)  
through Body (5804)  
Hydrostat Oil  
Reservoir (5810-2)  
SD Deck Discharge Shield (5848)  
Front Body Adjacent to  
RH Steering Lever (7818)  
Radiator Screen Frame Near Radiator Fill Cap (7826)  
On Body Adjacent to Clutch  
Control Lever (5806)  
Rear of Grass Catcher Exhaust Screen (5869)  
Rear Cross Member of Front Body (8825)  
Right Side of Front Body, Below  
Front Body Latch Release (7820)  
15  
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Safety Instructions  
SAFETY, CONTROL, AND INSTRUCTION DECALS  
Safety, Control, and Instruction Decals are installed on the machine;  
if any are missing, illegible, or damaged, a replacement should be ordered and installed before  
putting the machine into operation. The Decal Part Number is listed below and in the Parts Manual.  
Jackshaft Support Adjacent  
to Dipstick (7827)  
Deck Gearbox Cover (5807-3)  
Deck Carrier Frame (8647)  
Gear Axle (5810-1)  
Deck Carrier Frame (8653)  
Deck Carrier Frame (5865)  
Catcher Safety Latch,  
RH Side (5874)  
Right Side, Below Operator Seat (7809)  
Top of Blower Housing (5819)  
Catcher Door Hinge Bar,  
LH and RH Sides (5868)  
Left Side of Operator Seat (7819)  
Instrument Panel (7823-4)  
Fender, RH Side (7802)  
16  
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Assembly Instructions  
SETUP INSTRUCTIONS  
Dry Battery Service  
Walker Mowers are shipped partially assembled.  
After uncrating the tractor and mower deck, initial  
setup is required.  
DANGER  
Activating a battery can be dangerous.  
The battery should be taken to a reliable  
service station, battery store, or power  
equipment dealer where a trained techni-  
cian can activate the battery safely. DO  
NOT attempt to activate the battery unless  
you are experienced in battery service  
work. The following activation and charg-  
ing instructions are provided for use by a  
trained battery technician.  
NOTE: During the process of unpacking, any dam-  
aged or missing parts should be noted and reported  
to the delivering carrier immediately (put in writing  
within 15 days). The carrier will provide directions  
for proceeding with a claim to receive compensation  
for damage.  
Tire Installation (Tractor)  
• Install the drive tires using the eight (8) lug bolts  
that are supplied with the owner’s packet of mater-  
ials. Drive tires are 18 x 9.50-8, 4-ply; rear tires are  
13 x 5.00-6, 4-ply.  
DANGER  
• Check and adjust the inflation of the tires. The  
tire inflation recommendations are:  
Battery electrolyte is a poisonous and cor-  
rosive sulfuric acid solution.  
Drive = 15 PSI (103 kPa)  
Rear = 20 PSI (137 kPa)  
• Avoid spillage and contact with skin,  
eyes, and clothing - causes severe burns.  
Battery Service  
• To prevent accidents, wear safety gog-  
gles and rubber gloves when working with  
electrolyte.  
Raise front mower body up for battery access (refer  
to Front Body Latch Release in Operating Instruc-  
tions). Check the battery for electrolyte level and  
charge. The electrolyte level should be at the bot-  
tom of the vent wells [1/4 to 1/2 in. (6 to 13 mm)  
above plates]. If the specific gravity is less than  
1.225, the battery needs charging. If the battery has  
been shipped dry, or is wet but needs service, refer  
to the following instructions.  
• Neutralize acid spills with baking soda  
and water solution.  
To fill (activate) battery with electrolyte (if battery has  
been shipped dry):  
1. Remove the battery hold down bar, disconnect  
the battery cables and lift the battery out of the  
tray.  
IMPORTANT: Make sure battery is securely  
mounted in the frame. A loose battery may cause  
damage to the case resulting in acid leakage and se-  
vere damage to the machine. A hazard may be cre-  
ated by damage to critical working parts and safety  
systems.  
IMPORTANT: Battery must be removed from  
the mower before filling with electrolyte.  
IMPORTANT: Obtain and use only battery  
grade sulfuric acid electrolyte with a 1.265 spe-  
cific gravity to activate the battery. DO NOT use  
water or any other liquid during initial activation.  
Wet Battery Service  
Ifthebatteryhasbeenshippedwet,buttheelectrolyte  
level is low or the battery needs to be charged then:  
2. Remove the filler caps and carefully fill each cell  
until the electrolyte is just above the plates.  
1. Fill each battery cell with drinking water to the  
bottom of the vent wells.  
3. After the battery is filled with electrolyte, replace  
the filler caps and charge the battery. Refer to  
Battery Charging.  
2. Charge battery. Refer to Battery Charging in  
this section.  
17  
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Assembly Instructions  
Battery Charging  
WARNING  
DANGER  
Make sure the battery cap vents are open.  
Improper venting of the battery COULD  
cause a battery explosion.  
BATTERIES PRODUCE EXPLOSIVE GASES  
• Charge the battery in a well-ventilated  
area, so that gases produced while charg-  
ing can dissipate.  
• Keep sparks, flames, and smoking mate-  
rials away from the battery at all times.  
• Make sure the battery cap vents are open  
after the battery is filled with acid (check  
manifold vent on each cap).  
• Make sure the battery charger is unplug-  
ged before connecting or disconnecting  
cables to the battery.  
Battery Clamp Secured  
by Wing Nut(s)  
(+) Battery Cable  
Connection  
Battery Installation  
Mower Deck Assembly  
1. Charge the battery at 15 amps for 10 minutes.  
DO NOT exceed 20 amps maximum recom-  
mended charging rate. Charge until specific  
gravity is at least 1.250. Total charging time  
should not exceed one (1) hour.  
Deck Caster Wheels Installation  
1. Remove the bolt, nut, axle spacer tube, and  
spacer washers from each deck caster wheel  
fork.  
2. After charging the battery, adjust the electrolyte  
level to the bottom of the vent wells [1/4 to 1/2 in.  
(6 to 13 mm) above the plates].  
NOTE: Spacer washers are used only when  
the optional semi-pneumatic deck wheels (8.25  
x 2.75) are installed.  
IMPORTANT: DO NOT overfill the battery.  
Electrolyte will overflow through the vented caps  
onto parts of the machine and WILL result in  
severe corrosion.  
2. Fit the axle spacer tube through the wheel hub,  
position the spacer washer on each side of the  
hub (if used), and fit the assembly into the wheel  
fork.  
3. Install battery.  
Battery Installation  
3. Insert the 3/8-16 x 4-1/2 in. bolt through the  
wheel fork with the bolt head to the outside and  
install the 3/8-16 in. Keps nut.  
IMPORTANT: Make sure battery is securely  
mounted in the frame. A loose battery may cause  
damage to the case resulting in acid leakage and se-  
vere damage to the machine. A hazard may be cre-  
ated by damage to critical working parts and safety  
systems.  
4. Tighten the bolt and nut until the axle spacer  
tube bottoms against the inside of the wheel  
fork (will not turn) while the wheel and spacer  
washers (if used) spin freely without binding.  
Install the battery in the mower as shown in Battery  
Installation photo. Connect the positive and nega-  
tive cables to the proper battery terminal [red cable  
and boot connects to the Positive (+) terminal].  
Slide the rubber boot up and over the battery post,  
making sure it covers the post completely to pre-  
vent an electrical short.  
18  
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Assembly Instructions  
Deck Discharge Shield Installation  
(Side Discharge Models Only)  
Grease Fitting  
Locations  
Attach the deck side discharge shield by positioning  
the shield hinge lug in front of the deck mount and  
fastening with two 3/8-16 x 1-1/4 in. bolts, 3/8-16  
ESNA nuts, and 3/8 in. wave spring washers. The  
wave washers fit between the two hinging surfaces.  
Tighten the nuts until the shield moves freely but is  
not loose.  
Spacer Washer  
Axle Spacer Tube  
WARNING  
Deck Caster Wheel Installation  
DO NOT operate the machine without the  
grass deflector chute attached and in the  
lowest possible position.  
NOTE: If semi-pneumatic wheels are installed,  
make sure the spacer washers fit over the  
spacer tube and are not caught between the fork  
and the end of the tube. The washers should  
move freely on the axle spacer tube.  
Attach Shield  
5. Grease the caster wheel bearings and caster  
pivot bearings - one grease fitting for each  
wheel and each pivot.  
Deck Discharge Chute Installation  
(GHS Rear Discharge Models Only)  
Mount the discharge chute hinge on top of the deck  
discharge opening using the 1/4-20 x 1/2 in. socket  
button head bolt and 1/4-20 ESNA nut. Position the  
bolt with the head inside of the chute and the nut on  
the outside. Attach spring for tilt-up action from  
chute to bracket on deck.  
Discharge Shield Installation  
on Side Discharge Deck  
Carrier Frame  
Tube Sockets  
Attach  
PTO Shaft Guard Installation  
Position the shaft guard as shown and mount with  
two 1/4-20 x 1/2 in. bolts.  
Chute  
Attach Guard  
Tilt-Up Roller Wheel Installation  
Mount the two (2) tilt-up roller wheels on the brack-  
ets on the rear skirt of the deck housing using the  
P/N 8490 axle bolt, 3/8 in. wave spring washer and  
3/8-16 in. Whiz locknut. Tighten the axle bolt until  
the wheel rolls freely, but is not loose.  
Nut on Top  
Discharge Chute and PTO Shaft Guard  
Installation on Rear Discharge Deck  
19  
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Assembly Instructions  
5. Connect the mower deck PTO drive shaft  
assembly to the tractor with the splined quick  
disconnect coupler. This coupler simplifies  
shaft alignment and installation.  
Attach Spring  
a. Use the arrows on the shaft and tube to  
align and slide the PTO quick coupler onto  
the deck splined shaft.  
b. Reaching under the tractor, pull the ring  
back on the coupler, slide onto the spline  
shaft on the tractor, and release the ring.  
IMPORTANT: To prevent damage to the  
mower, make sure the PTO shaft assembly is  
securely locked on the tractor, with the locking  
balls fully seated in the groove and the ring in the  
full forward position (refer to the Coupler Ring  
“Locked” Position photo). After installation,  
pull on the shaft to check for security.  
Roller Wheels  
Tilt-Up Spring and Roller Wheel  
Installation on Rear Discharge Deck  
Mower Deck Installation on Tractor  
Deck Installation  
Pull Back Spring-Loaded  
Coupler Ring  
1. Lightly grease each deck support arm (2) on the  
tractor. RefertoMowerDeckInstallationphoto  
on next page for location of deck support arm.  
2. Engage the deck carrier frame tube sockets on  
the tractor support arms (refer to Discharge  
Chute and PTO Shaft Guard Installation  
photo for socket location). Slide the deck onto  
the support arms: all the way if SD equipped  
model, approximately 3 in. (76 mm) if GHS  
equipped model.  
Installing PTO Quick Coupler  
NOTE: When installing the DSD52 or DSD62  
Mower deck, make sure to retract the dolly  
wheel after mounting the deck on the tractor.  
Spring-Loaded Coupler Ring  
In Fully Forward Position  
3. If the deck is rear discharge (GHS equipped  
model), the rear discharge chute will need to be  
aligned and connected to the blower inlet dur-  
ing the last 2 in. (51 mm) of slide action on the  
support arms.  
NOTE: Raising the mower body may be helpful  
in fitting and guiding the deck chute into the  
blower.  
4. Install the hitch pin through the hole on the end  
of each support arm to lock the deck in place  
(refer to Deck Counterweight Spring Installa-  
tion photo). Two (2) hitch pins are included in  
the owner’s packet of materials.  
Coupler Ring “Locked” Position  
20  
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Assembly Instructions  
6. Raise the front mower body (instead of lifting  
the front of deck) and clip the counterweight  
springs to the receptacle on front of body.  
Lower the front body to tension the springs.  
(Refer to Deck Counterweight Spring Instal-  
lation photo.)  
7. With the counterweight springs connected, the  
weight on the deck caster wheels should be  
15 to 25 Ib (7 to 11 kg). Check this weight by lift-  
ing on the front of the deck carrier frame. If  
required, the spring tension can be adjusted by  
tightening or loosening the elastic stop nuts  
located underneath the lower spring hook.  
Refer to Deck Counterweight Spring Installa-  
tion photo.  
Grease Deck  
Support Arms  
Spring Tension Adjustment  
Nut Located Under Lower  
Spring Hook (Not Visible)  
PTO Connection  
Arrows on Shaft and Tube  
(used to align when sliding together)  
Mower Deck Installation (PTO Shaft Connection)  
Counterweight Springs Clip  
Onto Body With Forward  
Body Tilted Up  
Hitch Pins  
Lock Deck On  
Support Arms  
Deck Counterweight Spring Installation  
21  
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Assembly Instructions  
2. Check the side-to-side level. Rotate each blade  
sideways and measure the distance from blade  
tip to ground on each side. If measurements  
vary more than 1/8 in. (3 mm), add a washer  
shim under the decksupport pins on the low side  
to level the deck.  
Deck Leveling  
1. Position mower on a smooth, level surface. Set  
the cutting height to the highest position - 4 in.  
(102 mm) - for easy access under the deck to  
measure blade height. Refer to ADJUSTING  
CUTTING HEIGHT in Operating Instructions.  
3. Check the front-to-rear level. Rotate the blades  
to point forward. Measure the distance from  
blade tip to ground on the front and rear. The  
rear of the blade should be 1/8 to 1/4 in. (3 to 6  
mm) higher than the front of the blade; shim the  
rear (or front) deck support pins equally to  
achieve at least 1/8 in. (3 mm) difference.  
NOTE: A block of wood cut 4 in. (102 mm) high  
is a convenient gauge to measure blade height  
above ground during the leveling process.  
WARNING  
The machine must be shut off during this  
procedure.  
NOTE: The mower deck and support frame are  
jig welded; within normal tolerances, very little, if  
any, shimming should be required to level the  
deck. Tire pressure will influence the levelness  
of the deck. Check the tire pressure as a possi-  
ble cause of the deck not being level.  
4 in. (102 mm)  
Wood Block  
Should be 1/8 in. (3 mm)  
to 1/4 in. (6 mm) higher  
at the rear of the blade  
Should not vary more  
than 1/8 in. (3 mm)  
side-to-side  
4 in. (102 mm)  
Wood Block  
Deck Leveling  
22  
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Assembly Instructions  
PREOPERATING CHECKLIST  
CHECK ENGINE CRANKCASE OIL LEVEL  
Check the engine crankcase oil level before use and  
after each 5 hours of continuous operation. Refer  
to LUBRICATION for Checking Engine Crankcase  
Oil Level in Maintenance Instructions.  
Before operating the mower for the first time, and as  
a routine before daily operations, it is important to  
make sure the mower is properly prepared and  
ready for operation. The following is a list of items to  
be checked. (For a mower with frequent operation,  
some of these items will not need to be checked ev-  
ery day, but the operator should be aware of the con-  
dition of each.)  
CHECK AND SERVICE ENGINE AIR CLEAN-  
ER SYSTEM  
• Check air restriction gauge to make sure there  
is no red indication showing.  
For proper fuels and lubricants refer to Specifica-  
tions.  
• Check condition, cleanliness, and security of  
the complete air cleaner system (clean air filter  
every 100 hours). For detailed procedures,  
refer to CLEANING the Engine Air Cleaner  
System in Maintenance Instructions.  
FILL FUEL TANK  
Fill the fuel tank with clean, fresh fuel. Clean diesel  
fuel is particularly important since contaminated fuel  
will damage the fuel injectors and injection pump.  
CHECK ENGINE COOLING SYSTEM  
NOTE: An electric fuel pump makes it unneces-  
sary to bleed (purge out air bubbles) the diesel fuel  
injection system when initially fueling an empty fuel  
tank.  
• Check the radiator air intake screen to make  
sure the screen is clean and free of obstruction.  
Also, the radiator cooling fins should be  
inspected and cleaned if there is any buildup of  
dirt or debris. (Remove the intake screen  
assembly to inspect and clean.)  
DANGER  
• Check the coolant levels in the radiator and  
overflow tank. If additional coolant is needed,  
refer to CHECKING/SERVICING the Engine  
Cooling System in Maintenance Instructions.  
Handle diesel fuel with care. Use safe re-  
fueling procedures:  
• DO NOT fill fuel tank with the engine run-  
ning.  
• If the engine is hot, allow to cool before  
WARNING  
refueling.  
• Use an approved fuel container.  
• Fuel the mower outdoors.  
DO NOT remove the radiator pressure cap  
when engine is hot.  
• DO NOT smoke while refueling.  
• Avoid spilling fuel; use a funnel or spout.  
• Check engine fan belt.  
• DO NOT overfill the fuel tank; fill up to  
CHECK GEAR AXLE OIL LEVEL  
about 1 in. (25 mm) below the top of tank.  
Refer to LUBRICATION for Gear Axle Lubrication  
in Maintenance Instructions.  
IMPORTANT: DO NOT permit dirt or other foreign  
matter to enter the fuel tank. Wipe dirt from around  
the filler cap before removing. Use a clean fuel stor-  
age container and funnel.  
INSPECT FIVE (5) BELTS  
Engine PTO Drive, Jackshaft Drive, Hydrostatic  
Ground Drive, Engine Fan Belt, and GHS Blower  
Drive (if equipped).  
23  
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Assembly Instructions  
CHECK HYDROSTATIC TRANSMISSION OIL  
LEVEL  
Tilt-Up Lift Handle  
Tilt-Up  
Latch  
Refer to LUBRICATION for Checking Hydrostatic  
Transmission Fluid Level in Maintenance Instruc-  
tions.  
Tilt-Up Latch  
CHECK BATTERY ELECTROLYTE LEVEL  
Tilt-Up Hook  
on Deck  
Refer to CHECKING/SERVICING the Battery in  
Maintenance Instructions.  
CHECK FUNCTIONS OF INSTRUMENT PANEL  
AND WARNING HORN  
Deck Lock Lever  
Turn the ignition key to the RUN position. Voltmeter,  
Oil Pressure Warning Light, and Warning Horn  
should all operate, indicating normal function.  
Deck Secured in TILT-UP Position  
CAUTION  
CHECK TIRE PRESSURE  
Deck Caster Wheel = 20 PSI (137 kPa)  
Do not operate machine with deck tilt-up  
pivot joint unlocked.  
Drive  
Rear  
=
=
15 PSI (103 kPa)  
20 PSI (137 kPa)  
CHECK AND CLEAN GRASS BUILDUP  
UNDERNEATH MOWER DECK (and inside  
GHS blower, if equipped)  
DANGER  
Do not operate the mower with deck in tilt-  
up position. Do not move the tractor with  
the deck in the tilt-up position.  
Refer to CLEANING the GHS Blower in Mainte-  
nance Instructions for blower cleaning information.  
DANGER  
CHECK MOWER BLADE CONDITION, SHARP-  
NESS, AND SECURITY OF MOUNTING  
Never operate cutter blades with deck in  
raised position because it is hazardous.  
The blade mounting nut should be tightened to  
60 ft-lb (81.3 N·m). If blade sharpening is required,  
refer to CHECKING/SERVICING for Sharpen  
Mower Blades in Maintenance Instructions.  
The tilt-up deck can be secured in the raised position  
by unlocking the deck lock levers on each side of the  
carrier frame and inserting the deck hook into the tilt-  
up latch on the tractor body. Before operating the  
tractor, make sure to re-engage the deck lock levers  
after lowering the deck to the normal operating po-  
sition.  
CHECK DRIVE WHEEL BOLT TORQUE  
The lug bolts mounting the drive tires should be  
tightened to 75 to 85 ft-lbs. (101.7-115.2 N⋅m).  
ADJUST MOWER CUTTING HEIGHT, IF RE-  
QUIRED  
Position the hitch pins in the four deck support pins.  
Refer to the “Cutting Height Adjustment” decal on  
the deck gearbox cover.  
PERFORM ANY ADDITIONAL PROCEDURES  
called for on the MAINTENANCE SCHEDULE  
CHART in Maintenance Instructions.  
24  
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Operating Instructions  
CONTROL IDENTIFICATION, LOCATION, AND  
FUNCTION  
Engine Throttle  
The throttle control lever (red knob) is located on the  
left side of the seat and is used to control engine  
speed. Moving the lever forward toward the FAST  
position increases engine speed; moving it back-  
ward toward the IDLE position decreases engine  
speed.  
Operating Controls  
CAUTION  
Before operating the mower, become fa-  
miliar with the location and function of all  
operator controls. Knowing the location,  
function, and operation of these controls  
is important for safe and efficient opera-  
tion of the mower.  
Throttle  
Throttle Location  
Parking Brake  
Steering Levers  
Front Body  
Latch Release  
Forward Speed Control  
(FSC)  
Blade Clutch  
(PTO)  
Operating Controls  
25  
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Operating Instructions  
Forward Speed Control (FSC)  
Parking Brake  
Forward Speed Control (FSC) has two functions:  
One is to set forward travel speed, and the other is  
to establish the NEUTRAL-PARK position. When  
the FSC lever is moved into the FORWARD posi-  
tion, a friction lock holds any forward speed setting  
from 0 to 5 mph (0 to 8 km/h). The ground speed is  
proportional to the lever position; the further the le-  
ver is advanced forward, the faster the tractor  
moves. It is not necessary to hold the FSC in posi-  
tion since the friction lock maintains the selected le-  
ver position. Pulling back on the steering levers  
overrides the FSC setting and slows or stops for-  
ward travel. Releasing the steering levers allows  
the tractor to resume forward travel at the speed set  
by the FSC lever. To stop and park the machine, the  
FSC lever is moved backward to the NEUTRAL-  
PARK position.  
The parking brake functions by locking a pin into the  
hydrostatic transmission pinion gear teeth. Moving  
the lever FORWARD engages the parking brake;  
moving the lever BACKWARD releases the brake.  
IMPORTANT: Stop the tractor completely before  
engaging the parking brake. The parking brake  
uses a positive mechanical lock similar to the PARK  
position on an automotive automatic transmission.  
If the tractor is moving when the brake is engaged, it  
will result in sudden stoppage and possible internal  
damage to the axle drive.  
NOTE: If pressure on the parking brake pin (e.g.  
parked on a hill) makes it impossible to release the  
parking brake with the parking brake lever, move the  
mower gently forward or backward to release the  
pin.  
Steering Levers  
Front Body Latch Release  
Each drive wheel is controlled by its own indepen-  
dent steering lever, for both steering function and  
FORWARD/REVERSE motion. The FSC lever sets  
the maximum forward speed, and also sets the for-  
ward position of the steering levers. The steering le-  
vers operate only with a backward pulling  
movement of the lever, which causes the drive  
wheel for that lever to first slow down, stop, and then  
reverse with a full backward lever stroke. The levers  
are released to the FORWARD position for “straight-  
ahead” ground travel.  
The front portion of the tractor body hinges forward  
for maintenance access and is latched down in the  
OPERATING position. To raise the body, move the  
latch release forward.  
NOTE: Pushing forward on the steering levers will  
not cause any change in tractor motion - there will  
be no steering lever reaction and there will be no  
machine damage.  
Front Body  
Latch Release  
Blade Clutch (PTO)  
The blade clutch lever has two positions. Pulling the  
lever UP engages the PTO that drives the mower  
blades. Pushing the lever DOWN disengages the  
PTO and engages the blade brake.  
Front Body Latch Release  
NOTE: On GHS equipped models, the Powerfil ®  
motor and Grass-Pak® full signal switch are activat-  
ed by engaging the blade clutch. Refer to Using the  
GHS Catcher in this section for a complete descrip-  
tion of GHS operation.  
26  
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Operating Instructions  
Transmission Lockout Levers  
Cold Start Lever (Jackshaft Drive Belt Release)  
The transmission lockout levers disengage the hy-  
drostatic transmissons. By lifting the lever on top of  
the transmission and locking it into place with the  
lockout cam, the hydrostatic transmissions are re-  
leased to permit freewheeling. By releasing the cam  
and lowering the lever, the transmissions are en-  
gaged for normal operation. The transmission lever  
in the LOCKOUT position is used to enable moving  
the machine without the engine running (e.g., for  
service). Refer to TRANSMISSION LOCKOUT in  
this section for operating instructions.  
The cold start lever is used for starting the machine  
in cold weather [below 40° F (4° C)]. Pulling the le-  
ver DOWN disengages the jackshaft drive belt.  
When the jackshaft drive belt is released, the hydro-  
static transmissions are removed from the engine  
starter cranking load.  
Jackshaft Drive  
Engaged  
Lockout  
Levers  
Cold Start Lever - Normal Operating Position  
Transmission  
Plunger  
Lockout Lever Location  
NOTE: The transmission plunger on the side of the  
transmission case (activated by the LOCKOUT LE-  
VER) must be completely released during operation  
of the mower, otherwise operation of the transmis-  
sion will be erratic.  
Jackshaft Drive  
Disengaged  
Cold Start Lever - Cold Start Position  
27  
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Operating Instructions  
The Forward Speed Control also Establishes the Neutral-Park Position of the Steering Levers  
FORWARD SPEED  
CONTROL LEVER (FSC)  
LEFT WHEEL  
STEERING LEVER  
RIGHT WHEEL  
STEERING LEVER  
Full Forward  
Ground Speed  
Position  
Forward Position  
(No Control Change)  
Intermediate  
Ground Speed  
Position  
Neutral-Park  
Position  
Neutral-Park  
Position  
Reverse Drive  
Wheel Motion  
Position  
Engaged  
Position  
PARKING  
BRAKE  
Disengaged  
Position  
Disengaged  
Position  
THROTTLE  
Fast  
Throttle  
Position  
Engaged  
Position  
BLADE CLUTCH (PTO)  
Pull Up to Engage  
Idle  
Position  
Operating Controls (Top View from Drivers Point of View)  
28  
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Operating Instructions  
Instrument Panel  
This illustration shows the configuration of the  
switches and indicators located on the instrument  
panel.  
Water  
Temperature  
Oil Pressure  
Warning Light  
Water Temperature  
Warning Light  
Ignition  
Switch  
Voltmeter  
Gauge  
Light Switch  
(Optional)  
Circuit Breaker - 7 Amp  
(Instrument Panel)  
Hourmeter  
Warning Horn  
Circuit Breaker - 10 Amp (Headlights, Safety  
Interlock Switch System, Fuel Solenoid Hold,  
Powerfil® Motor - GHS Only, “Full” Signal Horn - GHS Only)  
Instrument Panel  
29  
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Operating Instructions  
• Engine fan belt  
Voltmeter  
• Thermostat function  
The voltmeter displays battery and charging system  
voltage. An indication of low or high voltage (the red  
area) indicates an electrical system failure. The  
cause of the failure should be determined and cor-  
rected.  
Stop the engine and correct the problem before fur-  
ther operation.  
IMPORTANT: Continued operation of the engine  
with an illuminated water temperature warning light  
MAY result in severe engine damage.  
Water Temperature Gauge  
Ignition Switch  
The water temperature gauge monitors engine  
cooling system temperature. If engine coolant  
temperature exceeds 230° F (110° C), an overheat  
condition exists; the water temperature light will  
come on and the warning horn will sound.  
The ignition switch is used to start and stop the en-  
gine (and preheat the diesel engine). The switch  
has four positions:  
is the glow plug preheat po-  
sition; “O” is the OFF position; RUN is the position  
the key returns to after starting; “S” is the START po-  
sition. When starting the engine, turn the key clock-  
wise to the “S” position. Do not hold the key in the  
“S” position longer than 10 seconds. If the engine  
does not start, return the key to the “O” position for at  
least 60 seconds before making a restart attempt.  
Prolonged cranking can damage the starter motor  
and shorten battery life. Release the key when the  
engine starts, and it will return to the RUN position.  
To stop the engine, rotate the key counterclockwise  
to the “O” position.  
WARNING  
If engine cooling system overheating is  
indicated, continued operation of the en-  
gine, even for a short time, COULD result  
in fire, risk of personal injury, and severe  
damage to equipment.  
Oil Pressure Warning Light  
NOTE: When starting the engine, turn and hold the  
ignition key in the glow plug preheat position. The  
time required is approximately 10 to 30 seconds, de-  
pending on engine temperature. Refer to START-  
ING THE ENGINE in this section.  
The oil pressure warning light indicates that engine  
oil pressure is below the safe operating level [below  
7 PSI (48 kPa)]. This light (and warning horn) will  
come on when the ignition is turned ON, but should  
go off after the engine is started. If the light fails to  
come on when the ignition switch is turned ON, it  
could indicate a burned out bulb. If the light comes  
on during engine operation, stop the engine imme-  
diately and correct the source of the problem before  
further engine operation.  
OFF  
Glow Plug Preheat  
ON  
IMPORTANT: Continued operation of the engine  
with an illuminated oil pressure warning light MAY  
cause severe engine damage (if a low oil pressure  
condition exists).  
Water Temperature Warning Light  
The water temperature warning light indicates that  
engine coolant temperature is above the safe oper-  
ating limit and the engine is overheating. If this  
light comes on, there may be a problem with:  
START  
Ignition Switch  
• Radiator cooling air flow (material packed into  
radiator cooling fins, clogged air intake screen)  
• Low coolant quantity in cooling system  
30  
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Operating Instructions  
Light Switch (For Optional Lights)  
Operates headlights (when installed).  
Hourmeter  
The hourmeter displays operating time accumu-  
lated while the ignition switch is in the ON position.  
The hourmeter provides maintenance reminders  
after certain hours of operation. The hourmeter  
screen will start flashing the reminder one hour prior  
to the recommended interval and will continue until  
one hour after the recommended interval (two  
hours). The hourmeter does not have a manual  
reset function.  
Hourmeter  
Circuit Breakers  
Two manual reset circuit breakers are located on the  
instrument panel. Each has a button that pops out if  
the circuit breaker trips. The 10 amp circuit breaker  
protects the circuits to the headlights, fuel valve so-  
lenoid, safety switch relays and time delay module,  
and GHS. The 7 amp circuit breaker protects the in-  
strument panel circuits to the meters, warning lights,  
and warning horn.  
Procedure  
Interval*  
Reminder  
C
Oil Change  
(Break-In)**  
4-6 Hours  
OIL  
H
G
Lubricate  
and Check  
Levels  
24-26 Hours  
LUBE  
Warning Horn  
C
Oil Change  
49-51 Hours***  
OIL  
H
G
The warning horn sounds to alert the operator that  
an unsafe engine condition is being indicated -  
when engine coolant temperature is too high or  
engine oil pressure is too low. If the horn sounds,  
check the indicator lights and water temperature  
gauge and correct the problem before further  
operation.  
*
These intervals reflect the actual time that the  
reminder will flash (one hour prior to and one  
hour after the recommended interval).  
** This reminder is only used one time.  
*** In normal operating conditions, oil changes in  
100-hour intervals are acceptable. Walker and  
the engine manufacturers recommend engine  
oil changes every 50 hours in extremely dirty  
or dusty conditions or for units with less than  
100 hours annual use.  
STARTING THE ENGINE  
CAUTION  
Before operating the mower, read and un-  
derstand all Safety Instructions and Operat-  
ing Instructions.  
NOTE: The blinking hour glass on the display  
means that the meter is operating properly.  
WARNING  
NEVER run the engine in an enclosed or  
poorly ventilated area. Engine exhaust  
contains carbon monoxide, an odorless  
and deadly gas.  
31  
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Operating Instructions  
1. Before attempting to start the engine, make  
sure the operator is in the seat, the Forward  
Speed Control is in NEUTRAL-PARK position,  
and the blade clutch and parking brake are  
DISENGAGED.  
3. Move the throttle 1/4 to 1/2 open (toward  
FAST) and turn the ignition switch to the  
START position to start the engine. Release  
the key to the RUN position as soon as the  
engine starts.  
NOTE: Release parking brake to prevent extra  
load on the starter if the transmission neutral is  
slightly out of adjustment.  
IMPORTANT: If the engine fails to start after  
approximately 10 seconds of cranking, the  
engine should be checked before further crank-  
ing. Turn the key to the OFF position and allow  
a 60 second cool-down period between starting  
attempts. Failure to follow these guidelines can  
damage the starter motor and shorten battery  
life.  
CAUTION  
A safety interlock switch system PRE-  
VENTS CRANKING the engine with either  
the Forward Speed Control or the blade  
clutch (PTO) out of neutral. If the engine  
cranks otherwise, the safety system is not  
working and should be repaired or ad-  
justed before operating the mower. DO  
NOT disconnect safety switches; they are  
for the operator’s protection.  
TROUBLESHOOTING NOTE: If the engine  
cranks but does not start, check the following:  
• The fuel valve solenoid is operating. Look at  
the exhaust pipe when cranking the engine - no  
smoke indicates no fuel is reaching the cylinder.  
If the solenoid is not operating, contact your  
Walker Dealer.  
NOTE: For starting in cold weather [below 40° F  
(4° C)], use the cold start lever to release the  
jackshaft drive belt and remove the hydrostatic  
transmission from the starter cranking load.  
After the engine has been started and warmed  
up, raise the lever to re-engage the jackshaft  
drive belt.  
• The glow plugs are operating. Look at the  
exhaust pipe when cranking the engine - white  
smoke indicates improper glow plug operation  
and inadequate preheat. Consult the Kubota  
Workshop Manual to check glow plug function.  
4. After the engine starts, make sure the oil  
pressure light goes off. If not, stop the engine  
immediately and find the cause of the problem.  
Make sure the oil pressure light is off prior to  
engaging the mower blades and beginning  
operation.  
Cold Start  
Lever Engaged  
Jackshaft Drive Belt Release  
2. Turn and hold the ignition key in the PREHEAT  
position to preheat the engine glow plugs. For  
temperatures below 35° F (2° C), the time  
required is approximately 25 to 30 seconds. For  
temperatures 35° F (2° C) or higher, the time  
required is approximately 10 to 15 seconds.  
32  
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Operating Instructions  
ADJUSTING GROUND SPEED AND STEERING  
NOTE: If the FSC lever will not stay in the  
selected position, the friction lock needs to be  
adjusted. Contact your Walker Dealer.  
IMPORTANT: If the DSD52 or DSD62 Mower  
deck is installed on the tractor, make sure the  
dolly wheel is retracted BEFORE moving.  
2. Steer by pulling the lever on the side of desired  
direction of turn, e.g., pull the LH lever to turn  
left. To minimize the possibility of overcontrol,  
use only one hand on both steering levers.  
CAUTION  
Learn to START, STOP, and MANEUVER  
the mower in a large, open area.  
Beginning Recommendations are:  
♦ Learn operation of the mower in an open  
area away from buildings, fences, and ob-  
structions. Learn operation on flat ground  
BEFORE operating on slopes.  
If the operator has not operated a ma-  
chine with LEVER STEERING OR DUAL  
HYDROSTATIC TRANSMISSIONS, steer-  
ing and ground operation should be  
learned and practiced until the operator is  
completely comfortable handling the ma-  
chine BEFORE ATTEMPTING TO MOW.  
♦ Start maneuvering the mower with SLOW  
engine speed and SLOW Forward Speed  
Control setting until familiar with all operat-  
ing characteristics.  
♦ Remember it is not necessary to hold the  
steering levers forward (a unique Walker  
feature); always PULL on the levers for  
steering or for reverse motion of the mower.  
DANGER  
Keep feet on footrests at all times when  
the machine is moving.  
♦ Learn to operate the mower with your left  
hand on the steering levers and right hand  
on Forward Speed Control. The use of two  
hands on the steering levers tends to cause  
overcontrol.  
1. Move the FSC out of NEUTRAL-PARK  
position to the desired forward speed. DO  
NOT hold forward on steering levers. It is not  
necessary to hold the FSC lever in position  
since a friction lock maintains the selected  
lever position (and forward travel speed).  
♦ Learn to operate the steering levers with  
smooth action. Jerky movements are hard  
on the transmission and lawn. For sharp  
turns, do not allow the inside wheel to stop  
and twist on the grass. Pull the steering le-  
ver controlling the inside wheel into reverse  
for a smooth “rolling” turn (one wheel roll-  
ing forward while the other rolls backward).  
WARNING  
In case either of the transmission drive  
belts break during operation, and if the  
machine is on a slope, the machine will  
freewheel down the slope. To maintain  
control, immediately (1) Release the  
steering levers and simultaneously (2)  
Move the FSC to the NEUTRAL-PARK  
position. When the machine is stopped  
or moving slowly, engage the parking  
brake.  
♦ Practice maneuvering the mower until  
you can make it go exactly where you are  
aiming.  
♦ Remember, for an emergency stop, or in  
case of loss of control, machine movement  
can always be stopped quickly by pulling  
the Forward Speed Control into the NEU-  
TRAL-PARK position.  
NOTE: This is exactly the same procedure  
used to normally stop and park the machine.  
33  
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Operating Instructions  
ENGAGING THE MOWER  
Pull Steering Levers  
With Left Hand  
1. Set the engine throttle at about 1/3 speed. Do  
not attempt to engage the blade clutch at  
high engine speeds. This will drastically  
shorten drive belt life. Use only moderate  
engine speed when engaging the blade clutch.  
2. Pull the blade clutch lever SLOWLY up to  
engage the mower blades.  
CAUTION  
Forward Speed Control  
(FSC)  
A safety interlock switch (seat switch) will  
cause the engine to stop if the blade  
clutch is engaged and the operator is not  
in the seat. The function of this switch  
should be checked by the operator rais-  
ing off the seat and engaging the blade  
clutch; the engine should stop. If the  
switch is not working, it should be re-  
paired or replaced before operating the  
mower. DO NOT disconnect the safety  
switches; they are for the operator’s pro-  
tection.  
Keep Feet On Footrest  
When Moving  
Correct Operator Hand Position on the Controls  
3. Reverse direction of the mower by pulling both  
levers backward.  
NOTE: Smooth action on the steering levers  
will produce smooth mower operation. Remem-  
ber to keep the engine and ground speed slow  
until learning the control response.  
4. The FSC may be adjusted forward for faster  
ground speed and backward for slower ground  
speed. When mowing, ground speed should  
be adjusted to match the load on the cutter  
blades, i.e., as the engine pulls down in heavy  
cutting, pull back on the FSC lever to reduce  
ground speed. Adjusting ground speed helps  
maintain a balance between engine power and  
blade speed for high-quality cutting action.  
IMPORTANT: DO NOT engage the blade  
clutch when transporting the mower across  
drives, sidewalks, loose materials, etc. DO NOT  
engage the blade clutch with the PTO shaft  
disconnected (the mower deck removed from  
tractor).  
CAUTION  
5. Stop ground travel by pulling both steering  
levers backward to the NEUTRAL position  
(tractor not moving) and then moving the FSC  
lever to the NEUTRAL-PARK position.  
If the cutting blades strike a stationary ob-  
ject while mowing, stop the mower imme-  
diately, disconnect the electrical plug on  
the fuel shut-off solenoid, lift the deck, and  
inspect the deck and blades thoroughly  
for damage. Make sure that the blade tim-  
ing has not been disturbed (the blades  
shouldbeat90degreestoeachother). Re-  
fer to REPLACING/REPAIRING the Blade  
Overload Shear Bolts in Maintenance In-  
structions if blades are out of time. Also,  
make sure the blade retaining nuts are  
torqued to 60 ft-lb (81.3 N·m).  
NOTE: If the tractor creeps forward or back-  
ward with the FSC lever in the NEUTRAL-PARK  
position, the transmission control needs to be  
adjusted. Contact your Walker Dealer.  
34  
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Operating Instructions  
IMPORTANT: DO NOT disengage the blade  
clutch with high engine speed (above 1/2 throt-  
tle) since the brake action on the blade drive will  
cause premature wear of the brake band.  
WARNING  
A brake stops the cutter blades (and  
blower on GHS equipped models) from  
freewheeling within five (5) seconds after  
disengaging the clutch. If the brake sys-  
tem malfunctions and the blades do not  
stop within five (5) seconds, the brake  
should be adjusted or repaired before op-  
erating the mower. Contact your Walker  
Dealer.  
Engaged  
Position  
4. Slow the engine to idle, put throttle in IDLE  
Blade Clutch Engaged  
position; and turn the ignition switch OFF.  
WARNING  
Remove the key from the ignition switch  
when leaving the mower unattended. This  
will prevent children and inexperienced  
operators from starting the engine.  
5. Engage the parking brake.  
IMPORTANT: The hydrostatic transmissions  
lock to prevent the mower from rolling freely with  
the engine stopped. However, if the mower is  
parked on a slope, it is necessary to ENGAGE  
the parking BRAKE to prevent the mower from  
creeping. This is due to a small amount of slip-  
page in the hydrostatic transmissions, especially  
when transmission fluid is warm.  
Disengaged  
Position  
Blade Clutch Disengaged  
STOPPING THE MACHINE  
ADJUSTING CUTTING HEIGHT  
WARNING  
1. Slow the engine to a fast idle; put the throttle in  
the 1/2 throttle position.  
The engine must be stopped before ad-  
justing cutting height. Disengage the  
blade clutch (PTO), stop the engine, and  
remove the ignition key. Wait for all move-  
ment to stop before getting off the seat.  
2. Pull the steering levers to the NEUTRAL  
position and then move the FSC lever  
backward to the NEUTRAL-PARK position.  
3. Disengage the blade clutch.  
35  
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Operating Instructions  
Cutting height is adjusted by positioning the four re-  
tainer hitch pins in a series of seven vertical holes on  
the deck support pins. Lift handles have been pro-  
vided on each end of the deck to assist in raising the  
deck while positioning the hitch pins. Cutting  
heights range from 1 in. (25 mm) [top holes] to 4 in.  
(102 mm) [bottom holes] in 1/2 in. (13 mm) incre-  
ments.  
Lockout Lever  
Plunger  
Depressed  
Lift Handle  
Cam in  
LOCKOUT  
Position  
Deck Support  
Pin  
Lockout Lever - Freewheel Position  
4. After moving the mower, release the locking  
Hitch Pin  
cam, placing the lever DOWN in the normal  
OPERATING position.  
Make sure the  
transmission lockout plunger on the side of the  
transmission case (activated by the lockout  
lever) is completely released, otherwise the  
transmission operation will be erratic.  
Cutting Height Adjustment  
TRANSMISSION LOCKOUT  
Lockout Lever  
IMPORTANT: DO NOT TOW this mower with the  
transmission lockout engaged. Towing can produce  
excessive internal pressure and damage the trans-  
mission.  
To move the mower with the engine NOT running  
(dead battery, maintenance, etc.), the hydrostatic  
transmissions are unlocked (released).  
Cam in  
UNLOCKED  
Position  
Plunger  
Released  
1. Raise the front body.  
2. Lift the transmission lockout lever on both the  
RH and LH transmissions and secure into  
place with the locking cam.  
3. The mower will “freewheel” with the levers in  
the LOCKOUT position. The levers must be in  
the highest position to completely unlock the  
transmissions.  
Lockout Lever - Normal Operating Position  
36  
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Operating Instructions  
RECOMMENDATIONS FOR MOWING  
• When using a side discharge mower deck, the  
side discharge shield must not be removed and  
must be kept in the lowest possible position to  
deflect grass clippings and thrown objects down-  
ward. Orient the side discharge away from side-  
walks or streets to minimize cleanup of clippings.  
When mowing close to obstacles, orient the side dis-  
charge away from obstacles to reduce the chance of  
damage to property by thrown objects.  
IMPORTANT: Operate the engine at full speed  
when mowing, to allow the engine to produce full  
horsepower and to increase efficiency of the engine  
cooling system.  
• Keep the mower deck and discharge chute clean.  
• Mow with sharp blades. A dull blade tears the  
grass (resulting in poor lawn appearance) and uses  
extra power (slowing the mowing speed).  
• It is preferable to cut grass when it is dry and not  
too tall. Mow frequently and do not cut grass too  
short. (For best appearance, cut off 1/3 or less of  
existing grass height.)  
• When mowing, operate the engine at or near full  
throttle for the best cutting action and performance  
of the grass handling system (GHS). Mowing with a  
lower engine RPM causes the mowing blade to not  
cut clean and tear the grass. The engine is  
designed to be operated at full speed.  
Side Discharge Shield in Lowest Position  
• When mowing in adverse conditions (tall and/or  
wet grass), mow the grass twice. Raise the mower to  
the highest setting - 4 in. (102 mm) - for the first pass  
and then make a second pass cutting to the desired  
height.  
• When operating on a slope, reduce speed and  
use caution to start, stop, and maneuver. Avoid  
sharp turns or sudden changes in direction. The  
maximum recommended side slope operating  
angle is 20 degrees or 33% grade.  
• Use a slow setting on the FSC for trimming  
operations.  
Maximum Recommended  
Side Slope - Do Not Operate  
on Steep Slopes  
• Make sure the mower is leveled properly for a  
smooth cut. Refer to Deck Leveling in Assembly  
Instructions.  
• Use an alternating stripe mowing pattern for  
best appearance and vary the direction of the stripe  
each time the grass is mowed to avoid wear patterns  
in the grass.  
• Avoid damage to the grass by slipping and skid-  
ding of the drive tires. Use smooth control move-  
ments of the steering levers since the hydrostatic  
transmissions are “power boosted controls” and  
jerking the levers can easily slip the tires. For sharp  
turns, do not allow the inside wheel to stop and twist  
on grass; pull inside steering lever into reverse for a  
smooth “rolling” turn (one wheel rolling forward while  
the other rolls backward).  
Maximum Recommended Side Slope  
37  
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Operating Instructions  
RECOMMENDATIONS FOR TILT-UP DECK  
OPERATION/TRANSPORT  
To avoid potential deck and/or tractor damage while  
using the tilt-up deck, the following recommenda-  
tions are offered:  
• Do not move the tractor with the deck in the tilt-  
up position since both the roller wheels (on the back  
of the deck) and the GHS discharge chute may be  
damaged by moving the tractor. The tilt-up configu-  
ration should only be used when the tractor is  
parked.  
• The tractor body should never be tilted for-  
ward with the deck in the tilt-up position. This can  
cause the deck to unhook from the tractor and fall  
with considerable force, potentially causing deck or  
tractor damage and/or bodily injury.  
• When transporting a tractor with the deck in the  
tilt-up position (on a truck or trailer), the deck  
should be secured to the vehicle with a strap or  
rope (stop vertical movement). This will prevent the  
deck from bouncing on the rear roller wheels (caus-  
ing breakage). This will also prevent the deck from  
unhooking from the tractor and falling, potentially  
causing deck or tractor damage. Damage to other  
items parked in front of the deck may also occur.  
38  
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Operating Instructions  
GRASS HANDLING SYSTEM (GHS)  
GHS Model Only  
Exhaust Screen  
(Removable)  
Catcher Door  
Safety Latch  
Grass-Pak®  
Vane Switch  
Powerfil ®  
Drive Motor  
Exhaust  
Deflector  
Actuator  
Rod  
“Full” Signal  
Horn  
PTO  
Clutch  
Catcher  
Door  
Catcher  
Door Spring  
PTO and Blade  
Gear Drive  
Grass Catcher  
Dump Handle  
Powerfil ®  
Delivery Spout  
Body Chute  
Assembly  
Blower  
Deck  
Discharge Chute  
Rear Discharge  
Mower Deck  
GHS Flow and Components  
39  
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Operating Instructions  
NOTE: When a side discharge or mulching mow-  
er deck is installed on the GHS model, a blower  
intake cover should be installed in the blower intake  
tube. This cover “unloads” the blower and seals  
the intake to effectively eliminate power loss and  
blower noise when the blower is not being used.  
General Information  
The Grass Handling System (GHS) consists of a  
rear discharge mower deck connected to a 10 in. (25  
cm) blower and a rear mounted grass catcher with  
7.0 bushel (246 liters) capacity or optional 9.5  
bushel (335 liters) capacity. The GHS blower oper-  
ates any time the mower blade clutch is engaged  
and moves grass through the rear discharge deck  
chute into the grass catcher. Blower airflow is ex-  
hausted out the back of the grass catcher, through a  
filtering screen. When the grass catcher is full and  
needs to be emptied, a “full” signal horn alerts the  
operator. When the “full” signal horn sounds, it is  
important to stop mowing to prevent overfilling and  
clogging of the blower system.  
Blower  
Intake Cover  
IMPORTANT: Normally, the GHS blower operates  
with no maintenance or cleaning required. However,  
under certain operating conditions, the inside of the  
blower housing may accumulate a deposit of dirt,  
causing wear and binding of the blower wheel.  
Normally, dirt buildup occurs when mowing a com-  
bination of dirty and damp grass, especially in  
the springtime. When operating in these condi-  
tions, check the blower wheel frequently for  
binding and clean the blower housing as required.  
Refer to CLEANING the GHS Blower in Mainte-  
nance Instructions.  
Blower Intake Cover  
NOTE: An alternative to using the blower intake  
cover when a side discharge or mulching deck is  
installed on a GHS model is the blower lockout kit  
(P/N 6541). The blower lockout kit releases ten-  
sion on the blower drive belt and does not require  
the blower intake cover.  
DANGER  
NOTE: In Autumn, when using the GHS mower to  
vacuum leaves, it is recommended to raise the front  
of the mower deck 2 to 3 notches [1 to 1-1/2 in. (25  
to 38 mm)] higher than the rear. This will avoid  
“bulldozing” leaves, particularly when the leaves  
are piled in a thick layer. To make this adjustment,  
the hitch pins in the two (2) front deck support pins  
are repositioned 2 to 3 notches higher while leaving  
the rear pins in their original position.  
ROTATING BLOWER BLADES  
NEVER operate the GHS blower with the  
blower discharge chute uncovered (grass  
catcher in the dump position) since dan-  
gerous projectiles may be thrown. NEVER  
put hands into the blower discharge chute  
for any reason. Use a stick or similar in-  
strument to remove any material if clog-  
ging has occurred.  
DANGER  
NEVER operate the GHS catcher with the  
back door open. Objects may be thrown  
out the back of the catcher with sufficient  
force to cause serious injury to bystand-  
ers or property damage.  
CAUTION  
NEVER leave grass clippings in the grass  
catcher after mowing. Damp clippings  
generate heat as they decompose. This  
MAY cause spontaneous combustion.  
40  
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Operating Instructions  
• Check the amount of flat section remaining at  
blade tip. This is the area that is ground away (re-  
moved) when the blades are sharpened. If too much  
of the flat section is removed, the “air lift” perfor-  
mance or “shovel” effect of the blade deteriorates to  
the point that discharge of grass clippings into the  
blower chute is marginal. Replace cutter blades if  
less than 3/4 in. (19 mm) flat section remains at the  
blade tip.  
Clogging Checklist  
In case of clogging, there will be a distinct change  
in the sound of the blower, i.e., the blower sound  
will stop. Also, the mower deck will begin to leave a  
trail of grass clippings. When this occurs, stop the  
engine, disconnect the electrical plug on the fuel  
shut-off solenoid, and make sure all movement  
has stopped before attempting to unclog.  
• Check that the interior of the deck housing and  
baffling is reasonably clean and free of grass and  
dirt buildup. While some degree of material buildup  
can be tolerated, a point is finally reached where the  
flow of air and grass clippings is restricted.  
DANGER  
NEVER place hands under the mower  
deck or in the GHS blower discharge  
chute. Use a stick or similar tool to re-  
move any clogged material.  
NOTE: One condition that quickly causes a  
buildup of material in the deck housing is mowing  
grass and/or weeds which are “juicy.” The material  
collects under the deck with sticky, green juice. Clo-  
ver and weeds are especially a problem. The mow-  
er deck will need to be cleaned frequently when op-  
erating in these conditions.  
Normally, any clogging will first develop at the back  
of the mower deck in the discharge opening into the  
blower chute. Clogging at this point does not indi-  
cate a particular problem in this part of the  
system, but is a symptom of something restrict-  
ing the flow of material throughout the entire  
system. The following list of items should be  
checked if a pattern of clogging begins to develop.  
All of these items are capable of causing clogging at  
the back of the deck.  
• Check the deck cutting height setting. When  
working in thick, tall grass, lower deck settings  
[1 to 2 in. (25 to 51 mm) cutting heights] tend to  
restrict airflow from moving into and under the  
deck. Raising the deck cutting height will signifi-  
cantly increase airflow and reduce clogging when  
working in thick, tall grass.  
• Check to see if the RH and LH mower blades are  
installed for the correct rotation - install blades so  
the cutting edges move toward each other.  
• Check the interior of the chute connecting the  
mower deck to the blower for smoothness and  
freedom from obstruction.  
Blades Must Operate at  
Right Angles (90 Degrees)  
FORWARD  
• Check the blower wheel for bent blades and  
excessive clearance between the blade tip and the  
blower housing. A clearance greater than 1/8 in.  
(3 mm) will cause a significant loss of blower  
performance.  
• Check the blower discharge chute into the grass  
catcher for smoothness and freedom from ob-  
struction.  
• Check the elbow inside the grass catcher for a  
buildup of material in the radius of the elbow. In  
certain conditions (damp/dirty grass) a considera-  
ble “clump” of material can accumulate at this point,  
greatly restricting material and airflow.  
Mounting Nut  
Torque = 60 ft-lb  
Rear Discharge  
(81.3 N⋅m)  
Chute  
Blade Rotation for GHS Mower Deck  
(view from underneath)  
41  
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Operating Instructions  
• Check that the openings in the removable air  
exhaust screen in the grass catcher are not  
plugged. If the screen is clogged, refer to Cleaning  
the GHS Exhaust Screen in this section.  
WARNING  
DO NOT test the Grass-Pak® switch with  
the engine running. Projectiles may be  
thrown out of the grass delivery spout,  
and COULD cause serious injury.  
Remember, anything that restricts airflow or material  
flow along the entire path from the mower deck to  
the grass catcher can cause clogging.  
Using the Tilt-Up Deck  
The “full” signal horn is designed to operate (sound)  
when the grass catcher is almost full. The timing of  
the signal is adjustable by changing the position of  
the vane on the Grass-Pak® switch. If the signal is  
coming on too soon (catcher not completely full) or  
too late (grass clogging in catcher spout and deliv-  
ery chute), refer to ADJUSTMENTS for GHS Signal  
Horn Adjustment in Maintenance Instructions.  
Refer to CLEANING of Grass Buildup in Mower  
Housing in Maintenance Instructions.  
Using the GHS Catcher  
Powerfil ®  
The GHS catcher has an oscillating grass delivery  
spout (POWERFIL®) which is designed to spread  
grass clippings throughout the interior of the grass  
catcher (even when mowing wet, heavy grass). The  
oscillating action may be checked by turning the  
ignition switch to the ON position and moving the  
blade clutch to the ENGAGED position. The spout  
should oscillate approximately 25 cycles per  
minute.  
NOTE: The horn signal should be adjusted to  
sound BEFORE the catcher is completely full to  
give the operator time to react and stop mowing. An  
indication the horn signal is coming on too late (de-  
layed too much) is if grass clippings are falling out of  
the grass catcher delivery chute when the catcher is  
dumped.  
Cleaning the GHS Exhaust Screen  
NOTE: If the grass spout fails to oscillate, the  
clutch switch should be checked for function (the  
switch closure is adjustable).  
To remove the grass catcher screen for cleaning,  
open the catcher door, push forward and pull down  
on the grass catcher screen knobs (on either side of  
the screen), and slide the screen out. Use a high  
pressure washer or water spray and brush to clean  
the screen.  
“Full” Signal Horn  
The GHS catcher has a “full” signal horn to alert  
the operator to dump the catcher when it is full (to  
prevent overfilling and clogging). The “full” signal  
horn is activated by a vane switch (Grass-Pak®  
switch) mounted on the grass delivery spout. Oscil-  
lating action of the spout triggers the vane switch as  
grass begins to fill in around the spout when the  
catcher is almost full.  
Keeping the catcher exhaust screen clean and open  
is essential to good performance of the catching  
system. In some mowing conditions, e.g., wet and  
dirty, it will be necessary to clean the screen fre-  
quently to avoid clogging the mower deck, blower,  
and chutes due to airflow restriction.  
The “full” signal function may be checked by turning  
the ignition switch ON, engaging the blade clutch  
(engine not running), opening the catcher back door,  
and triggering the Grass-Pak® vane by hand as it  
oscillates. The horn should sound as the switch is  
moved in both directions.  
42  
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Operating Instructions  
Grass Catcher  
Screen  
Safety  
Latch  
Removal  
Knobs  
(Not Visible)  
Catcher Door Safety Latch  
Grass Catcher Screen Removal for Cleaning  
Using the Dump Bag  
Dumping the Catcher  
1. Open the back door by lifting on the door  
handle.  
For dumping, the catcher either tailgate dumps into  
a disposal area or dumps into the optional dump  
bag. The dump bag is a reusable nylon fabric bag  
designed to conveniently move grass clippings from  
the catcher to a remote disposal area or container.  
NOTE: To prevent accidental door closure,  
a safety latch locks the door open in the  
fully opened position while the catcher is be-  
ing dumped.  
2. Orient the dump bag with one of the handle  
straps on the bag opening facing up.  
Tailgate Dumping  
1. Open the back door by lifting on the door handle.  
Tailgate  
Door  
Handle  
NOTE: To prevent accidental door closure,  
a safety latch locks the door open in the  
fully opened position while the catcher is be-  
ing dumped.  
2. Tilt the catcher back to dump by lifting on the  
catcher lift handle on the lower front corner of  
the catcher.  
3. Lower the catcher smoothly down to the normal  
operating position. DO NOT allow the catcher  
to drop down.  
Hook Bag  
on Bumper  
4. Close the door by holding the door handle  
with the left hand and releasing the safety  
latch on the door hinge mechanism with the  
right hand. The safety latch is released by  
pressing in on the top of the latch. Then,  
smoothly close the door, working against the  
spring pressure that holds the door closed.  
DO NOT let the door slam shut by releasing  
the door before it is closed.  
Positioning Dump Bag on Catcher  
43  
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Operating Instructions  
3. Hook the bottom of the bag over the rear  
bumper while lifting on the handle strap.  
Power Dump Option  
When equipped with the optional power dump sys-  
tem, the operator dumps the catcher while sitting in  
the seat. A toggle switch operating a power ram is  
used to raise and lower the catcher. The back door  
automatically opens and closes during the dump  
cycle.  
4. Tilt the catcher back to dump into the bag by  
lifting on the catcher lift handle on the lower  
front corner of the catcher with the one hand  
while continuing to hold up on the bag strap  
with the other hand. Refer to photos for posi-  
tioning the bag and dumping.  
Hold the toggle switch UP or DOWN to RAISE or  
LOWER the catcher. When the catcher reaches the  
full raised or lowered position, the power ram clutch  
will make a ratcheting sound. Release the toggle  
switch as soon as this sound is heard. DO NOT op-  
erate the ram with the clutch ratcheting for an  
extended time as this will cause extra wear on the  
clutch mechanism.  
CAUTION  
The operator should be in the seat and  
bystanders stay clear when the power  
dump is operating. The power dump is  
used ONLY for tailgate dumping. Do not  
attempt to use the optional dump bag or  
any other bag with the power dump.  
Catcher Lift/  
Dump Handle  
NOTE: If grass tends to hang up in the catcher af-  
ter raising the catcher with the power dump, “jiggle”  
the steering levers and make the tractor bounce a lit-  
tle to unstick the grass and make it slide out of the  
catcher.  
NOTE: With the power dump mechanism in the  
normal operating position (catcher down), the  
catcher can be manually raised for access to the  
engine and the catcher can be manually dumped.  
Dumping Catcher into Dump Bag  
5. Lower the catcher smoothly down to the normal  
operating position. DO NOT allow the catcher  
to drop down.  
6. Close the door by holding the door handle  
with the left hand and releasing the safety  
latch on the door hinge mechanism with the  
right hand. The safety latch is released by  
pressing in on the top of the latch. Then,  
smoothly close the door, working against the  
spring pressure that holds the door closed.  
DO NOT let the door slam shut by releasing  
the door before it is closed.  
44  
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Operating Instructions  
Door Actuator  
Arm  
Grass Catcher  
Catcher Door  
Gas Spring  
Cable  
Guide  
Lift Channel  
Rear Body  
Panel, RH  
Power Dump  
Ram Actuator  
Fork  
Catcher Door  
Cable Rod  
Guide  
Cable Assembly  
Rear Body  
Panel, LH  
Gas Spring  
Actuator Mount  
Assembly  
Dog Leg  
Assembly  
Rubber  
Bumper  
Power Dump Components  
45  
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Maintenance Instructions  
CAUTION  
Maintenance procedures requiring special training or  
tools should be performed by a trained technician.  
MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MDD  
25  
Hours  
100  
Hours  
200  
Hours  
Every  
Yearly 2Years  
Ref.  
Page  
Service Item  
Daily  
Check Engine Crankcase Oil Level  
Check Coolant Level in Radiator  
and Overflow Tank  
x
x
48  
60  
Clean Radiator Screen and Cooling Fins*  
Check Security of Air Filtration Components  
Check Air Filter Restriction Gauge  
Clean Grass Buildup Under Deck  
Clean GHS Exhaust Screen*  
x
x
x
x
x
x
x
57  
61  
56  
58  
42  
59  
62  
Clean GHS Blower*  
Service Mower Blades  
Check Functions of Instrument Panel and  
Warning Horn  
x
24  
Lubricate Grease Fittings and Oil Points*  
Check PTO Gearbox Oil Level**  
Check Battery Electrolyte Level  
Check Hydrostatic Transmission Fluid  
Check Tire Pressure  
x
x
x
x
x
49  
53  
61  
54  
61  
Check Drive Belts (Jackshaft, Engine PTO,  
x
x
63  
GHS Blower, Ground Drive and Engine Fan Belt)  
Check Gearbox Oil Seals  
Check Turbine Precleaner*  
Check/Clean Air Filter Element***  
Change Engine Crankcase Oil ∆  
Check Fan Belt Tension  
63  
55  
56  
48  
60  
63  
53  
59  
48  
63  
63  
x
x
x
x
x
x
x
x
Check Blade Brake Action  
Check Oil Level in Gear Axle  
Clean Hydrostatic Transmission Cooling Fins  
Change Engine Oil Filter  
Check Radiator Hoses and Clamps  
Check Fuel Lines and Clamps  
x
x
Replace Air Filter Element and  
Vacuator™ Valve***  
x
56  
Replace Fuel Filters  
Flush Radiator and Change Coolant  
Service Battery  
x
x
x
70  
58  
61  
Check/Adjust Vertical Position of  
x
72  
Grass-Pak® Switch  
Change Gear Axle Oil ∆∆  
Replace Radiator Hoses and Clamps  
Replace Fuel Lines and Clamps  
x
x
x
53  
63  
63  
∗
More often in extremely dusty or dirty conditions (refer to notes about air cleaner element in  
IMPORTANT TIPS FOR CARE OF KUBOTA ENGINE)  
∗∗ Change PTO gearbox oil after first 100 hours of operation (break-in period)  
∗∗∗ Air cleaner is remote mounted Donaldson Radialseal™ unit, replace filter every year or after 6 cleanings  
Change engine oil and filter after first 35 hours of operation of a new engine (break-in period)  
∆∆ Change every 2 years or 1000 hours  
∆
46  
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Maintenance Instructions  
KUBOTA TIPS  
IMPORTANT TIPS FOR CARE OF THE KUBOTA  
ENGINE  
• Maintain proper fluid levels in the radiator and  
overflow tank.  
• Operate the engine at full speed when mowing.  
This will allow the engine to produce full horsepower  
and move more cooling air through the radiator.  
Fuel System  
• Fuel must be clean - free from water, dirt, and or-  
ganic material. Fuel contamination will greatly short-  
en the life of the fuel injection pump and injectors.  
Air Cleaner System  
• Use only Donaldson air cleaner elements. After-  
market elements may not seal in the air cleaner  
housing, allowing dirt to enter the engine. Also, af-  
termarket filters often skimp on the filtration media  
and require more frequent cleaning and replace-  
ment (see following instructions).  
• Change fuel filters on a regular basis and when  
contamination is suspected or found in the fuel.  
• Model MDD is equipped with an electric fuel  
pump; therefore it is normally not necessary to bleed  
air out of the fuel system (after running out of fuel or  
fuel system maintenance).  
• Use the air flow restriction gauge to indicate the  
• When checking and bleeding the fuel system use  
the air vent plug on the fuel filter and the injector  
pump. DO NOT attempt to bleed the fuel system by  
loosening fuel lines on the fuel injection pump as this  
could damage the pump.  
need to service the air filter.  
• DO NOT overservice or frequently “disturb” the  
air filter. A dirty air filter actually cleans better than  
a new one. Changing and cleaning the filter too of-  
ten can actually reduce filter efficiency and increase  
the opportunity for traces of dust to enter the engine.  
Wait until the element really needs servicing as indi-  
cated by the air flow restriction gauge.  
Starting/Stopping  
• DO NOT use ether or any starting fluid in the  
air intake. This will damage the engine.  
• Do frequently check the Turbine Precleaner for  
• For starting in cold weather [below 40° F (4° C)],  
use the cold start lever to release the hydrostatic  
transmissions from the starter cranking load.  
free movement of the internal fan.  
• When the air filter element is removed or re-  
placed, make sure all dust is cleaned out of the air  
cleaner housing and hose. Use a damp cloth and  
wipe the interior of the canister and hose clean (a  
little dirt left here will be sucked into the engine and  
reduce engine life). When the filter is reinstalled,  
make sure the element is held tight and straight  
in the canister for proper seating and sealing.  
• Start engine with the throttle advanced off idle  
(1/4 to 1/2 throttle). This will aid starting, especially  
in cold weather.  
• Keep the battery fully charged.  
• Match crankcase oil viscosity to the ambient tem-  
perature, allowing the engine to crank faster and  
start easier.  
• Periodically check the air intake hose for cuts,  
nicks, etc., and the hose clamps for tightness.  
• Allow engine to run at idle for a few seconds be-  
Oil  
fore stopping engine to avoid run-on or backfiring.  
• Use any top quality oil with an API classification of  
CD or greater. DO NOT use oil that is rated for gas-  
oline engines only (API SE/SF) as this will cause  
problems in a diesel engine.  
Cooling System  
• Fill the cooling system with a pre-mixed solution  
of 50/50 antifreeze (ethylene glycol) and distilled  
water.  
• Single viscosity or multi-viscosity oils may be  
used with the viscosity matching ambient tempera-  
tures for the engine operating conditions. This will  
aid starting in cold weather and assure proper lu-  
brication in hot weather.  
IMPORTANT: Solution must be pre-mixed before  
putting it in the engine (adding pure antifreeze into  
the radiator may cause damage to the engine by  
causing overheating).  
• Use only Kubota oil filters. Aftermarket filters  
may not seal properly and/or have the incorrect  
pressure relief valve for proper lubrication.  
47  
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Maintenance Instructions  
LUBRICATION  
LUBRICATION  
IMPORTANT: DO NOT operate engine without  
a sufficient oil supply in the crankcase. DO NOT  
operate with the oil level below the lower mark or  
above the upper mark on the dipstick.  
WARNING  
DO NOT attempt to lubricate the machine  
with the engine running. Disengage the  
PTO clutch, shut off the machine, and re-  
move the ignition key.  
5. If additional oil is needed, refer to Specifications  
for proper crankcase lubricant. Fill up to, but  
not above, the upper mark on the dipstick.  
IMPORTANT: DO NOT overfill the crankcase  
(oil above upper mark) as this CAN result in  
engine overheating, loss of power, and possi-  
ble engine damage.  
Proper lubrication is an important maintenance pro-  
cedure. It reduces wear and makes the machine  
quieter and easier to operate.  
Engine Oil  
Engine Break-In Oil  
No special break-in oil is required. The engine is  
serviced with 10W-30, Service Class SG oil from the  
factory. Change the oil after the initial engine break-  
in period of 35 hours. Thereafter, change oil after  
every 100 hours of operation.  
Upper Mark  
Checking Engine Crankcase Oil Level  
Check the engine crankcase oil level before use and  
after each 5 hours of continuous operation.  
IMPORTANT: The importance of checking and  
maintaining the proper crankcase oil level cannot be  
overemphasized. Check the oil level BEFORE  
EACH USE.  
Lower Mark  
Dipstick Operating Range  
1. Park the mower on a level surface with the en-  
gine stopped. Also, make sure the engine is  
cool and oil has had time to drain into the sump  
[allow at least five (5) minutes after stopping  
the engine].  
Changing Engine Crankcase Oil/Oil Filter  
Change the engine crankcase oil after every 100  
hours of operation and replace the oil filter every  
other oil change (every 200 hours of operation).  
IMPORTANT: NEVER check or add oil with the  
engine running.  
1. Park the mower on a level surface with the en-  
gine stopped. The engine oil should be warm  
before draining. If not warm from operation,  
start the engine and run a few minutes to warm  
the oil.  
2. Before removing the dipstick, clean the area  
around the dipstick to keep any dirt or debris out  
of the engine.  
2. Before removing the dipstick and oil fill cap,  
clean the area around them to keep any dirt or  
debris out of the engine.  
3. Remove the dipstick, wipe off with a clean rag,  
then reinsert the dipstick into the tube and press  
all the way down.  
3. Removethedipstick, oilfillcap, andoildrainplug  
and drain the oil into a suitable container. Be  
sure to allow ample time for complete drainage.  
4. Remove the dipstick again and check the oil lev-  
el on the dipstick. The oil level should be within  
the “Operating Range” on the dipstick (between  
the lower mark and the upper mark).  
48  
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Maintenance Instructions  
LUBRICATION  
7. Install the new oil filter on the engine. Turn the  
filter clockwise until the rubber gasket contacts  
the sealing surface, then tighten the filter an  
additional 1/2 turn.  
8. Reinstall the drain plug. Make sure it is tight-  
ened to 10 ft-lb (13.6 N·m).  
9. Fill the crankcase with new, clean oil. Use only  
crankcase lubricants recommended by the en-  
gine manufacturer. Refer to Specifications in  
this manual or the engine owner’s manual. Use  
the recommended oil viscosity for the expected  
ambient temperature. Oil with the correct vis-  
cosity will aid starting in cold weather and as-  
sure proper lubrication in hot weather. Fill up  
to, but not above, the upper mark on the dip-  
stick. Crankcase capacity is 3.1 quarts (2.9 li-  
ters) plus 1/2 pint (.24 liters) for the new oil filter.  
Drain Plug  
Oil Drain Location  
(view from left side of tractor)  
4. Before removing the oil filter, clean the area  
around the filter to keep dirt and debris out of  
the engine.  
IMPORTANT: DO NOT use oil that is rated for  
gasoline engines only (API SE/SF). This will  
cause problems with a diesel engine.  
IMPORTANT: Check the dipstick reading be-  
fore adding the last 1/2 pint of oil and fill only to  
the upper mark. DO NOT overfill the crank-  
case (oil above upper mark) as this CAN result  
in engine overheating, loss of power, and pos-  
sible engine damage.  
Oil Filter  
10. Start the engine and check for oil leaks around  
the oil filter. Stop the engine, recheck the oil  
level, and add oil if necessary. (When the en-  
gine is first operated with a new oil filter, the oil  
level drops slightly as the filter is filled with oil.)  
Grease Fitting and Oil Point Lubrication  
Oil Filter Location  
Lubricate the grease fittings and oil points after ev-  
ery 25 hours of operation. Lubricate more often  
when operating in dusty or dirty conditions. Use  
SAE general purpose lithium or molybdenum base  
grease for grease fittings and light machine oil (SAE  
10) to lubricate oil points. Lubricate the locations  
shown in the Chassis and Deck Lubrication  
Points illustration.  
5. Remove the old oil filter and wipe off the filter  
mounting surface on the engine.  
6. Apply a thin coating of clean oil to the rubber  
gasket on the replacement oil filter.  
IMPORTANT: Use ONLY oil filters from the en-  
gine manufacturer (Kubota 15841-32439). Af-  
termarket oil filters may not seal properly and/or  
may not have the correct pressure relief valve  
for proper lubrication. Also, the filter length di-  
mension is critical for tailwheel clearance.  
NOTE: PTO universal joints (on the deck and trac-  
tor) require routine lubrication after every 8 hours  
of running time.  
49  
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Maintenance Instructions  
LUBRICATION  
Ident  
No.  
Lubrication  
Type  
No.  
Places  
Ident  
No.  
Lubrication  
Type  
No.  
Places  
Location  
Location  
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2LOꢀꢀꢀ  
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2LO  
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7KURWWOHꢁ&RQWUROꢁ3LYRW  
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*
Gearboxes are permanently lubricated and  
sealed requiring no scheduled lubrication.  
Oil level should be checked only when an oil  
leak is noted. Refer to Mower Deck Gear-  
box Lubrication in this section.  
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tion.  
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50  
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Maintenance Instructions  
LUBRICATION  
1
2
3
2
1
4
4
5
6
7
6
8
6
9
7
6
8
10  
12  
13  
12  
11  
14  
15  
16  
17  
13  
18  
30  
23 & 32  
31  
18  
20  
19  
30  
29  
28  
21  
23  
22  
27  
24  
25  
26  
25  
Chassis and Deck Lubrication Points  
51  
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Maintenance Instructions  
LUBRICATION  
Mower Deck Gearbox Lubrication  
NOTE: In case the gearboxes are completely  
drained of oil, approximately 5 fl. oz. (15 cl) of oil  
per gearbox is required to refill the gear drive  
assembly.  
NOTE: These instructions apply to all mower  
decks with gear-driven blades. Refer to DSD52 or  
DSD62 Mower Deck Lubrication in this section for  
the DSD52 or DSD62 deck with belt-driven blades.  
NOTE: Since the gearboxes are connected as  
a unit by connector tubes, it is necessary to add  
oil slowly. Allow a few minutes after adding oil  
for the oil to flow throughout the assembly and  
the oil level to stabilize before reassembly.  
The mower deck gearboxes (tee gearbox and blade  
drive gearboxes) are connected as a unitized as-  
sembly, and oil flows freely between them. The gear-  
boxes are permanently lubricated (oil filled) and  
sealed requiring no scheduled lubrication. Howev-  
er, the gearbox oil seals should be checked every  
25 hours for indication of an oil leak; particularly  
the lower seals on the blade drive gearboxes  
should be inspected, since they operate in a dirty en-  
vironment. If an oil leak is noted, replace the oil seal  
and relubricate the gearbox assembly as follows:  
IMPORTANT: DO NOT overfill the deck gear-  
boxes. The gearbox assembly is not vented,  
and overfilling with oil will cause excessive pres-  
sure and result in oil leaks.  
5. Check condition of the cover gasket and replace  
if worn or damaged. Reinstall gearbox cover  
plates; torque screws to 24 in-lb (2.7 N·m).  
1. Remove gearbox cover (footrest). Deck orien-  
tation should be the normal operating position.  
DSD52 or DSD62 Mower Deck Lubrication  
There are several special lubrication requirements  
for the DSD52 or DSD62 mower deck in addition to  
the requirements detailed in the Chassis and Deck  
Lubrication illustration. Lubricate the locations  
shown in the Blade Spindle Lubrication and Gear-  
box, Dolly Wheel, and U-Joint Lubrication photos  
and check and maintain oil in the belt drive gearbox.  
Blade Drive  
Gearboxes  
1. Lubricate the blade spindles every 25 hours  
with two (2) shots of SAE general purpose lithi-  
um or molybdenum base grease.  
Tee  
Gearbox  
Blade  
Spindles  
Mower Deck Gearboxes  
(shown with gearbox cover removed for clarity)  
2. Clean the area around the individual gearbox  
cover plates to prevent contaminants from en-  
tering the gearcase.  
3. Remove the screws securing the cover plates  
on the blade drive gearboxes.  
4. Check the level of lubricant in the gearboxes. If  
the lubricant is low, add SAE E.P. (Extreme  
Pressure) 90W oil until the oil level is up to (sub-  
merges) the horizontal shaft in the gearbox  
(shaft parallel to cover plate).  
Blade Spindle Lubrication  
52  
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Maintenance Instructions  
LUBRICATION  
2. Check the oil level in the belt drive gearbox  
every 100 hours (or sooner if a visible oil leak  
has developed). With the deck in the normal  
operating position, remove the level plug in the  
side of the gearcase. Add SAE E.P. (Extreme  
Pressure) 90W oil to maintain the oil level to the  
plug. If the oil level is low, check the gearbox for  
any indication of an oil leak. If an oil leak is  
noted, the gearbox will need to be removed and  
rebuilt.  
Jackshaft  
PTO  
Gearbox  
Dipstick  
3. Lubricate the dolly wheel pivot every 25 hours  
with general purpose grease.  
4. Lubricate the U-Joint in the drive shaft every  
8 hours with SAE general purpose lithium or  
molybdenum base grease.  
Dipstick Location, Tractor PTO Gearbox  
Changing Gearbox Oil  
The tractor PTO gearbox is oil filled and vented. No  
scheduled oil change is required. However, chang-  
ing the oil after the first 100 hour break-in period  
will extend gearbox life and is recommended.  
Belt Drive  
Gearbox  
1. Remove the drain plug in the bottom of the  
gearcase, drain the oil, and reinstall the plug.  
2. Refill the gearbox through the dipstick stand-  
pipe using 7 to 8 fl. oz. (21 to 24 cl) of SAE E.P.  
(Extreme Pressure) 90W gear lube.  
Dolly Wheel  
Level Plug  
Pivot  
U-Joint  
3. Check that the oil level is at the FULL mark on  
the dipstick. DO NOT overfill.  
Gearbox, Dolly Wheel, and U-Joint Lubrication  
Gear Axle Lubrication  
• The gear axle oil lubrication is SAE 80W-90 (API  
Tractor PTO Gearbox Lubrication  
GL-5) gear lube.  
Checking Gearbox Oil Level  
• Check the axle oil level after every 100 hours of  
operation by removing the oil level plug. If additional  
oil is needed, remove the breather vent on top of ax-  
le and fill until oil is at the level plug.  
Check the gearbox oil level every 25 hours, and if  
necessary, add oil [SAE E.P. (Extreme Pressure)  
90W gear lube] to maintain oil level to the FULL  
mark on the dipstick.  
• Change axle oil every 1000 hours or two (2)  
IMPORTANT: DO NOT overfill the PTO gearbox to  
years.  
avoid oil leakage out of the dipstick standpipe.  
If the oil level is low, check the gearbox for any indi-  
cation of an oil leak. If an oil leak is noted, the gear-  
box will need to be removed and rebuilt.  
53  
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Maintenance Instructions  
LUBRICATION  
Hydrostatic Transmission Fluid  
b. If no fluid leaks from around the air bleed  
plug:  
Checking Hydrostatic Transmission Fluid Level  
*
Slowly add fluid into the reservoir until  
fluid starts to leak from around the plug.  
(Transmissions are serviced from the  
factory with Mobil 1 (15W50) Synthet-  
ic Oil). When it is necessary to add flu-  
id, refer to Specifications for the proper  
fluid.  
Hydrostatic transmission fluid level should be  
checked every 25 hours of machine operation. It is  
preferable to check the fluid level when fluid is  
cold. Check fluid level as follows:  
1. Park the mower on a level surface. Stop the  
engine and wipe dirt and contaminants from  
around the reservoir cap and air bleed plug.  
*
As soon as there is fluid leaking from  
around the air bleed plug, tighten the  
plug and fill the reservoir to the COLD  
level mark. Wipe any excess oil off of  
the transmission housing.  
IMPORTANT: Before removing the reservoir  
cap, clean any dirt from around it. Any dirt or  
contaminants entering the transmission will ac-  
celerate wear and eventually cause loss of pow-  
er to the drive wheels.  
IMPORTANT: DO NOT overfill the transmission  
reservoir. This will result in oil leaking out of the res-  
ervoir cap vent when the transmission warms up. It  
is preferable to add fluid to the transmission when it  
is cold and make sure the oil is not above or be-  
low the COLD level mark.  
2. Remove the reservoir cap and check the level  
of the fluid. The reservoir has a fluid level COLD  
mark and HOT mark. The reservoir oil level  
should ALWAYS be at or above the COLD  
mark and NEVER above the HOT mark.  
IMPORTANT: The transmission reservoir has a fine  
mesh screen in the bottom to trap dirt and foreign  
particles from entering the transmission. When fill-  
ing the reservoir, fluid will flow quite slowly through  
this screen; so it is essential that there is fluid at the  
bleed plug before the transmission is considered  
full.  
Reservoir Cap  
IMPORTANT: Any attempt to remove or in any way  
alter the filtering screen in the transmission reservoir  
could cause damage to the transmission and will  
VOID any transmission warranty.  
Hot  
Level  
Air Bleed  
Plug  
Cold Level  
Transmission Reservoir  
and Air Bleed Plug Location  
3. If the fluid is below the COLD mark (or the trans-  
mission is not performing properly), loosen the  
air bleed plug (located on the top of transmis-  
sion case next to the plastic reservoir).  
a. If a small amount of fluid leaks from around  
the air bleed plug:  
*
*
The transmission is full of fluid.  
Tighten the plug and fill the reservoir to  
the COLD level mark.  
54  
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Maintenance Instructions  
CLEANING  
CLEANING  
dust from the air, giving the initial stage of air clean-  
ing. Dust particles are exhausted through a single  
small vent in the side of the housing. Since no dust  
is trapped, the precleaner operates without clean-  
ing. The only maintenance required is to check the  
operation of the internal fan every 100 hours. Verify  
operation:  
Engine Air Cleaner System  
There are two main components in the engine air  
cleaner system: a turbine precleaner and a Donald-  
son Radialseal™ air cleaner. Each component is  
checked, cleaned and maintained on a different  
schedule based on the filtering action required.  
Each component is serviced as follows:  
1. Look into the exhaust vent while shining a light  
into the intake.  
Turbine Precleaner  
2. Start the engine and watch the fan begin to spin  
as the throttle is advanced.  
The turbine precleaner is mounted on a remote air  
intake tube connected to the Donaldson air cleaner.  
A spinning fan driven by the intake airflow separates  
If the fan is not spinning, service or replace the pre-  
cleaner as required.  
Donaldson Air  
Cleaner Cover  
Air Restriction  
Gauge  
Turbine Precleaner  
Hose  
Clamp  
Vacuator™  
Valve  
Air Cleaner  
Cartridge  
Precleaner Tube  
Safety Filter  
Donaldson  
Air Cleaner  
Hose  
Clamp  
Air Intake  
Hose  
Hose  
Clamp  
Engine  
Engine Air Cleaner System Components  
55  
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Maintenance Instructions  
CLEANING  
Donaldson Radialseal™ Air Cleaner  
Push Button to Reset  
Indicator After Service  
A remote mounted Donaldson Radialseal™ air  
cleaner provides the air filtering function. The paper  
filter element slides over an outlet tube inside the air  
cleaner canister with radial sealing action, eliminat-  
ing the possibility of dust leaks due to improper filter  
installation. Intake design, internal baffling, and a  
Vacuator™ valve provide dust separation and auto-  
matic precleaning action. Daily or frequent servicing  
of the air cleaner is not required. Use the air re-  
striction gauge on the air cleaner outlet to indicate  
when the air filter needs servicing -- a red flag will  
appear when the filter is overly restricting airflow into  
the engine.  
Air Restriction  
Gauge  
Air Restriction Gauge Location  
IMPORTANT: Use only Donaldson air filter ele-  
ments for replacement (Donaldson P822686 or  
Walker 5090-1). Aftermarket filters may not seal  
properly or filter efficiently.  
Clean and inspect the paper element after every  
100 hours of service and replace the element year-  
ly or after six (6) cleanings (or when dirty or dam-  
aged). More frequent cleaning may be required  
when operating in extremely dusty conditions as in-  
dicated by the air restriction gauge. Service the air  
cleaner as follows:  
Cover  
Canister  
1. Release the top and bottom cover latches and  
remove the air cleaner cover. Wash the cover  
and Vacuator™ valve. Check that these com-  
ponents are in good condition. The Vacuator™  
valve is subject to wear and deterioration and  
should be replaced yearly or when damaged.  
The lips of the valve should close and fit togeth-  
er; any cracks, deformation, or wear in the valve  
is cause for replacement.  
Vacuator™  
Valve  
Radialseal™  
Filter Element  
Cover Latch  
2. Remove the filter element by pulling it out of the  
canister. There will be some initial resistance as  
the filter seal breaks loose and slides off of the  
outlet tube. Gently move the end of the filter up  
and down and side to side or twist to loosen the  
seal. Use gentle action to minimize the amount  
of dust dislodged as the filter is removed.  
Air Cleaner Components  
(shown with cover being removed)  
IMPORTANT: The Donaldson air cleaner uses a  
dry paper-type filter element. NEVER apply oil to  
the paper element.  
3. Clean the filter element using low pressure  
compressed air [less than 100 PSI (689 kPa)].  
Blow out the filter from the interior of the ele-  
ment while turning the element.  
NOTE: Washing the element in water or clean-  
ing solution is not recommended. Replace the  
element if it does not clean up with compressed  
air.  
56  
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Maintenance Instructions  
CLEANING  
4. Use a bright light inside the element to inspect  
for damage. Check the element very carefully  
for pin holes or other damage that will allow  
dirt to leak through the paper media. Replace  
element if necessary.  
9. Install the cover with the word “TOP” properly  
oriented to the top of the canister. Give the cov-  
er a slight twist as it reaches the canister to  
make sure the tab inside the cover goes into a  
slot, otherwise the cover will not fit properly.  
Make sure both the top and bottom cover latch-  
es are securing the cover in place.  
5. Check the condition and resilience of the radial  
sealing surface (inside of the open end) of the  
filter. Replace the filter if any cracks, tears, or  
other damage to the sealing surface are noted.  
Cover Latch  
Orient to Top  
of Canister  
6. Use a clean, damp cloth and wipe the interior of  
the air cleaner canister clean. Use special care  
to clean both the inside and outside surfaces  
of the outlet tube.  
IMPORTANT: Any dust left on the inside of the  
outlet tube will go into the engine and cause  
wear.  
Vacuator™  
Valve  
Cover Latch  
7. Check the outside surface of the outlet tube for  
smoothness and cleanness (this is the sealing  
surface).  
Proper Orientation of Air Cleaner Cover  
8. Insert and seat the filter element carefully into  
the canister, applying pressure at the outer rim  
of the filter; not at the flexible center. Make sure  
the filter element is completely in place before  
installing the cover.  
10. Check the air intake hose for cuts, nicks, etc.,  
and the hose clamps for tightness.  
11. Reset the air restriction indicator (press button  
on bottom).  
IMPORTANT: DO NOT use the cover latches  
to force the filter into the canister -- the cover  
should fit on with no extra force.  
Engine Cooling System  
Radiator Screen and Cooling Fins  
NOTE: DO NOT use petroleum based lubri-  
cants on the sealing surface of the filter; use tal-  
cum powder or dry silicone lubricants if required  
for filter installation.  
To prevent the engine from overheating and possi-  
ble engine damage, clean grass clippings, chaff,  
and dirt from the fine mesh radiator intake screen  
daily. In certain mowing conditions (dry grass,  
leaves, tree “cotton”, etc.), it may be necessary to  
check and clean the screen several times during use  
to prevent engine overheating.  
Radialseal™  
Canister  
Filter Element  
1. Lift to remove the screen. To clean the screen,  
wash with soapy water or blow out with com-  
pressed air.  
2. Inspect the radiator cooling fins for material  
lodged in this area which would restrict cooling  
airflow. Use pressurized air or water to clean.  
DO NOT use any tool, like a screwdriver or  
knife, to clean material out of the fins as this  
may damage the cooling fins. DO NOT use cold  
water on a hot radiator.  
Radial Sealing  
Surface  
Safety Filter  
Air Filter Element Replacement  
57  
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Maintenance Instructions  
CLEANING  
NOTE: Directing pressurized air or water from  
the fan side of the radiator outward is recom-  
mended to dislodge material packed on the out-  
side of the cooling fins. DO NOT use cold water  
on a hot radiator.  
Grass Buildup in Mower Housing  
DANGER  
Before raising or removing the mower  
deck for cleaning, stop the engine, re-  
move the ignition key, and disconnect the  
electrical plug on the fuel shut-off sole-  
noid.  
WARNING  
Radiator and engine parts can become ex-  
tremely hot during operation. Wear gloves  
and avoid touching hot parts while clean-  
ing the radiator screen and cleaning de-  
bris away from the engine and cooling  
system.  
1. Raise the deck lock lever handle on each side  
of the carrier frame and pull out to release car-  
rier frame for tilting action.  
2. Using the carrier frame lift handle, raise deck to  
the TILT-UP position and insert the deck hook  
into the tilt-up latch on the tractor body.  
Flushing Radiator and Changing Coolant  
Change engine coolant every year. Drain the cool-  
ant from the engine and radiator:  
Tilt-Up Lift Handle  
Tilt-Up Latch  
1. Remove the radiator cap.  
2. Open the drain cocks on the engine block and  
radiator (see the Kubota Owner’s Manual for lo-  
cation of the drain cocks). Also, drain the cool-  
ant recovery tank.  
Tilt-Up Latch  
3. If there is any indication of deposits or scaling  
inside the radiator, use a commercial scale re-  
mover and flush the cooling system thor-  
oughly before adding fresh coolant.  
Tilt-Up Hook  
on Deck  
Deck Lock Lever  
Deck Secured in TILT-UP Position  
DANGER  
Use a pre-mixed 50/50 solution of antifreeze (ethyl-  
ene glycol) and distilled water to refill the cooling  
system.  
IMPORTANT: The solution of antifreeze and water  
must be thoroughly pre-mixed before putting it in the  
engine. Adding pure antifreeze into the radiator may  
cause damage to the engine from overheating.  
Do not operate the mower with deck in tilt-  
up position. Do not move the tractor with  
the deck in the tilt-up position.  
IMPORTANT: Maintain proper coolant level in the  
radiator and coolant recovery tank. The coolant lev-  
el should be maintained between FULL and LOW  
marks on the coolant recovery tank. Recheck the  
coolant level after the first time the engine has been  
operated after filling the coolant system (it would be  
normal to add a little coolant after initial operation).  
3. Clean grass buildup underneath the deck using  
a pressure washer (and scraper if required).  
NOTE: While some degree of material buildup  
in the mower deck housing can be tolerated, a  
point is finally reached where cutting quality  
deteriorates and clogging begins to occur  
because of too much buildup on the baffling and  
housing.  
58  
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Maintenance Instructions  
CLEANING  
4. Lower the deck to the normal operating position  
and re-engage the deck lock levers.  
2. Use a pressure washer or water spray, and di-  
rect the spray inside the blower housing against  
the blower blades. Water pressure will cause  
the blower wheel to begin to spin and the com-  
bination of spinning action and water will effec-  
tively wash the inside of the housing. Spray  
may be directed against the blower blades ver-  
tically and horizontally to cause rotation in both  
directions for thorough washing action. Wash  
blower until the blower wheel spins freely in  
both directions.  
CAUTION  
Do not operate machine with deck tilt-up  
pivot joint unlocked.  
GHS Blower  
3. Reinstall the GHS blower drive belt by reversing  
the removal procedure.  
Normally, the GHS blower operates with no mainte-  
nance or cleaning. However, when mowing grass  
that is dirty and damp (especially springtime mow-  
ing), a deposit of dirt may accumulate inside the  
blower housing, causing wear and binding of the  
blower wheel. When operating in these conditions,  
inspect the blower frequently for dirt buildup.  
Blower  
Pulley  
Blower  
Drive Pulley  
NOTE: A visual clue of binding of the blower wheel  
is the blower blade tips are polished from rubbing  
on dirt.  
When a dirt deposit is found, use a high pressure  
washer or water spray to clean the inside of the  
housing as follows:  
GHS Blower  
Drive Belt  
Belt Tightener  
Idler Pulley  
DANGER  
Before attempting to wash the blower,  
stop the engine, remove the ignition key,  
and electrical plug on the fuel shut-off so-  
lenoid.  
Collapse Blower Belt Tightener  
to Remove GHS Blower Drive Belt  
GHS Exhaust Screen  
Refer to Cleaning the GHS Exhaust Screen in  
Operating Instructions.  
1. Remove the GHS blower drive belt tension by  
depressing the idler pulley on the tightener arm.  
Roll the belt off the blower pulley. The belt  
should be clear of the blower pulley, allowing  
free movement of the blower wheel.  
Hydrostatic Transmission Cooling Fins  
Keeping the cooling fins on the hydrostatic transmis-  
sions clean and free of obstruction is essential to  
avoid overheating the transmission fluid and short-  
ening transmission life. The cooling fins should be  
checkedevery100hours;and cleaned if necessary.  
IMPORTANT: With the belt removed, the blow-  
er wheel must spin freely. Any binding or drag-  
ging of the wheel is an indication of dirt  
buildup. This buildup must be cleaned to  
avoid abrasive wear of the blower blades, ex-  
cessive power loss and eventual loss of blower  
performance (clogging).  
To clean the fins, use compressed air and/or a  
pressure washer. The cooling fins extend all the  
way around the housing -- the fins underneath need  
to be clean as well as the more visible fins above.  
Also, pay close attention to the area under the drive  
pulley.  
59  
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CLEANING/  
CHECKING/SERVICING  
Maintenance Instructions  
IMPORTANT: In case an oil leak develops on the  
input shaft, the cooling fan blowing dusty air and oil  
on the transmission will quickly pack the cooling  
fins with oily dirt. If this condition occurs, replace  
the seal immediately to avoid overheating and dam-  
aging the transmission. The input shaft assembly  
and seal are easily replaced without removing the  
transmission from the machine.  
Engine Cooling System  
Coolant Level  
WARNING  
NEVER remove the radiator pressure cap  
when the engine is hot — hot water could  
spray and cause a burn if the cap is taken  
off too soon.  
An additional procedure in maintaining transmission  
cooling is to inspect the cooling fans. Replace the  
fan(s) if blades are missing or damaged.  
Check the coolant level in the coolant recovery tank  
and maintain the coolant level between the FULL  
and LOW marks on the recovery tank. When the  
engine is cold, the coolant level should be at or  
slightly above the LOW mark on the recovery tank.  
If the coolant level is low, remove the radiator cap  
and fill to the overflow port level and then fill the re-  
covery tank above the LOW mark. Use a pre-mixed  
50/50 solution of antifreeze (ethylene glycol) and  
distilled water to fill the cooling system.  
Cooling Fan  
Cooling Fins  
IMPORTANT: The coolant solution of antifreeze  
and distilled water must be thoroughly pre-mixed be-  
fore putting it in the engine (adding pure antifreeze  
into the radiator may cause damage to the engine by  
causing overheating).  
Fan Belt Tension  
Check and adjust the fan belt tension to avoid en-  
gine overheating and insufficient battery charg-  
ing. Push on the belt in the middle of the span  
between the alternator and crankshaft. If properly  
tensioned, it should deflect about 0.4 in. (10 mm).  
Also check the belt for cracks or deterioration.  
Hydrostatic Transmission Cooling Fins  
CHECKING/SERVICING  
Fan Belt  
DANGER  
To prevent accidental starting of the en-  
gine when servicing or adjusting the ma-  
chine, remove the key from the ignition  
switch and disconnect the electric plug on  
the fuel shut-off solenoid.  
0.4 in. (10 mm)  
Deflection  
Fan Belt Tension  
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Maintenance Instructions  
CHECKING/SERVICING  
Security of Air Filtration Components  
Cleaning the Terminals  
NOTE: The following inspection is only an exter-  
nal inspection and should be done without “dis-  
turbing” the filtration components.  
If battery terminals are corroded, remove battery  
from the mower. Using a wire brush, remove corro-  
sion with a solution of one part baking soda and  
four parts water. Rinse with clean water. Coat the  
terminals with petroleum jelly or terminal protector  
spray to retard further corrosion.  
On a daily basis, visually inspect the external condi-  
tion of the complete air cleaner system. The follow-  
ing items should be inspected:  
Charging the Battery  
1. Check the Donaldson Radialseal™ air cleaner  
canister for damage. Make sure the cover is in  
place and the cover latches are secure - do not  
run the engine without the air cleaner cover in  
place and secure.  
Check the battery charge by measuring the specific  
gravity of electrolyte; if specific gravity is less than  
1.225, the battery will need to be charged as follows:  
1. Charge the battery at 15 amps for 10 minutes.  
DO NOT exceed 20 amps maximum recom-  
mended charging rate. Charge until specific  
gravity is at least 1.250. Total charging time  
should not exceed one (1) hour.  
2. Inspect the air intake hose for cracks, nicks,  
cuts, etc., and check the hose clamps for tight-  
ness.  
Battery  
2. After charging the battery, use drinking water to  
adjust the electrolyte level to the bottom of the  
vent wells [1/4 to 1/2 in. (6 to 13 mm) above the  
plates].  
NOTE: For initial battery service during setup, re-  
fer to Battery Service in Assembly Instructions.  
IMPORTANT: Make sure battery is securely mount-  
ed in the frame. A loose battery may cause damage  
to the case resulting in acid leakage and severe dam-  
age to the machine. A hazard may be created by  
damage to critical working parts and safety systems.  
DANGER  
BATTERIES PRODUCE EXPLOSIVE  
GASES  
Electrolyte Level  
• Charge the battery in a well-ventilated  
area, so that gases produced while charg-  
ing can dissipate.  
The battery electrolyte level should be checked af-  
ter every 25 hours of operation. To check electro-  
lyte level:  
• Keep sparks, flames, and smoking ma-  
terials away from the battery at all times.  
1. Remove battery cell filler caps.  
• Make sure the battery cap vents are open  
2. Check the electrolyte level. If the level is below  
the bottom of the vent well, fill with drinking wa-  
ter to the bottom of the vent wells [1/4 to 1/2 in.  
(6 to 13 mm) above the plates].  
(check manifold vent on each cap).  
• Make sure the battery charger is un-  
plugged before connecting or discon-  
necting cables to the battery.  
3. Replace filler caps.  
IMPORTANT: DO NOT overfill the battery.  
Electrolyte will overflow through the vented caps  
onto parts of the machine and WILL result in se-  
vere corrosion.  
Tire Pressure  
Inflate tires to pressures shown below:  
Deck Caster Wheel = 20 PSI (137 kPa)  
Drive = 15 PSI (103 kPa)  
Rear = 20 PSI (137 kPa)  
61  
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Maintenance Instructions  
CHECKING/SERVICING  
Sharpen Mower Blades  
4. If the blade cutting edge is dull or nicked, it  
should be sharpened. Remove blades for  
sharpening by grasping the end of the blade us-  
ing a rag or a thick, padded glove, while loosen-  
ing and removing the nut, lock washer, and flat  
washer that mounts the blade.  
Check mower blade(s) for straightness, sharp-  
ness, condition of the cutting edge, and balance  
every 10 hours of operation (or more often when  
mowing abrasive type grass or operating on sandy  
soils). Replace blades if worn, bent, cracked, or  
otherwise damaged (refer to REPLACING/RE-  
PAIRINGtheMowerBladesinthissection). Usethe  
following procedure to check and sharpen blades:  
5. Grind cutting edge at the same bevel as the  
original. Sharpen only the top of the cutting  
edge to maintain sharpness.  
NOTE: Keep blades sharp - cutting with dull  
blades not only yields a poor mowing job but  
slows the cutting speed of the mower and caus-  
es extra wear on the engine and blade drive by  
pulling hard.  
NOTE: Blades can be sharpened with an elec-  
tric blade sharpener, conventional electric grind-  
er, or a hand file.  
CAUTION  
1. Stop the engine, remove ignition key, and dis-  
connect the electrical plug on the fuel shut-off  
solenoid before raising the mower deck to ser-  
vice blades.  
ALWAYS wear eye protection and gloves  
when sharpening a blade.  
2. Raise the deck and secure it in the TILT-UP po-  
sition. Refer to CLEANING the Grass Buildup  
in Mower Housing in this section for deck rais-  
ing instructions.  
Intersection  
Sharpen at  
Original 30° Angle  
Wear Area  
DANGER  
Wing  
Tip  
30°  
NEVER operate cutter blades with the  
deck in the raised position.  
Do Not Grind or  
Sharpen on Underside  
3. Check the blades for straightness by marking  
the blade tip position inside the deck housing,  
and then rotating the opposite end of the blade  
to the same position and comparing. If the dif-  
ference in blade tip track is more than 1/8 in.  
(3 mm), the blade is bent and should be re-  
placed.  
Mower Blade Profile For Sharpening  
6. Check blade balance by positioning the blade  
horizontally on a blade balancer or use a nail  
or shaft through the center hole. If either end of  
the blade rotates downward, grind (remove)  
metal on that end until the blade will  
balance. The blade is properly balanced when  
neither end drops. Balance of a blade is gener-  
ally maintained by removing an equal amount of  
material from each end of the blade when  
sharpening.  
WARNING  
DO NOT try to straighten a blade that is  
bent. NEVER weld a broken or cracked  
blade. ALWAYS replace with a new blade  
to assure safety.  
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Maintenance Instructions  
CHECKING/SERVICING  
Fuel Lines and Clamps  
Every year, inspect the fuel supply line from the tank  
to engine for deterioration or damage. Also, inspect  
the fuel line clamps for tightness. Good preventive  
maintenance calls for complete replacement of fuel  
lines and clamps every two (2) years.  
NOTE: This procedure is of special importance for  
the diesel engine due to poor performance when air  
is injected with the fuel.  
Blade Balancer  
Radiator Hoses and Clamps  
Inspect the radiator hoses every 200 hours for de-  
terioration or damage. Also check the tightness of  
the hose clamps. Good preventive maintenance  
calls for complete replacement of the radiator hoses  
and clamps every two (2) years.  
Blade Balanced on Magnetic  
Wall-Mounted Balancer  
7. Mount the blade with wing tips pointing up into  
the housing. Reinstall the blade, washer, lock  
washer, and nut. Tighten the nut to 60 ft-lb  
(81.3 N·m).  
Blade Brake Action  
NOTE: When reinstalling blades on GHS models,  
remember, the blades turn toward each other  
(counter-rotate) and the RH and LH blade cannot be  
switched. Check for proper blade rotation before in-  
stalling blades on the deck. Refer to Blade Rota-  
tion for GHS Mower Deck illustration shown in  
Clogging Checklist in Operating Instructions for  
correct blade rotation.  
WARNING  
It is important to check and maintain blade  
brake action for safe operation of the ma-  
chine.  
Check the function of the cutter blade brake (and  
blower brake on GHS models) by engaging the  
blade clutch (PTO), operating the engine at full throt-  
tle, then disengaging the clutch and measuring how  
quickly the blades stop. Watch the rotation of the  
blade drive shaft and blower pulley as a visual indi-  
cation that movement has stopped. If the brake is  
working properly, all rotation will stop five (5)  
seconds after disengagement of the clutch. If the  
brake system malfunctions - blades do not stop in  
five (5) seconds - adjust or repair the brake before  
operating the mower. Contact your Walker Dealer.  
Drive Belts  
Raise the body and inspect the condition of the five  
(5) belts (4 belts on SD models) every 25 hours of  
operation - engine PTO drive, jackshaft drive, hydro-  
static ground drive, GHS blower drive, and engine  
fan belt. If the belts show signs of cracking or de-  
teriorating, the belts should be replaced. Refer to  
REPLACING/REPAIRING the Drive Belts in this  
section.  
Mower Deck Gearbox Oil Seals  
The mower deck gearbox seals should be inspected  
every 25 hours for evidence of oil leaking; particu-  
larly the lower oil seal on the blade drive gearbox.  
This seal is protected by the trash guard on the blade  
hubandsealprotectorplateonthehousing, butisstill  
vulnerable to seal damage due to operating in an ad-  
verse environment. The mower blade must be re-  
moved for inspection of the seal, so it is  
recommended to inspect the gearbox seals when  
blades are removed for sharpening. If an oil leak  
isnoted,thesealshouldbereplacedandthegearbox  
assembly relubricated. Refer to LUBRICATION for  
Mower Deck Gearbox Lubrication in this section.  
63  
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Maintenance Instructions  
REPLACING/REPAIRING  
REPLACING/REPAIRING  
Drive Belts  
There are five (5) individual belts on GHS models  
or four (4) belts on SD models:  
DANGER  
• Engine PTO Drive Belt (3 Groove Power Band)  
• Jackshaft Drive Belt  
To prevent accidental starting of the en-  
gine when replacing parts or repairing the  
machine, remove the key from the ignition  
switch and disconnect the electrical plug  
on the fuel shut-off solenoid.  
• GHS Blower Drive Belt (GHS Model Only)  
• Hydrostatic Ground Drive Belt  
• Engine Fan Belt  
IMPORTANT: ALWAYS use genuine factory re-  
placement parts. Substitute parts CAN result in  
product malfunction and possible injury to the oper-  
ator and/or others.  
The belts may be removed and replaced using the  
procedures described on the following pages.  
Jackshaft  
Drive Belt  
Engine  
PTO Belt  
Engine  
Fan Belt  
Hydrostatic Ground  
Drive Belt  
GHS Blower Belt  
(GHS Model Only)  
Belt Locations  
64  
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Maintenance Instructions  
REPLACING/REPAIRING  
Engine PTO Drive Belt (3 Groove Power Band)  
1. To remove the engine PTO drive belt:  
c. Remove the PTO drive belt by “walking”  
the belt off of the engine and PTO pulleys  
one groove at a time until the belt is com-  
pletely removed.  
a. Remove the jackshaft drive belt from its  
idler pulley (by pushing down on cold start  
lever) and let the belt drop down out of the  
way.  
2. Install the PTO drive belt by reversing the re-  
moval procedure. Check and make the  
following adjustments:  
NOTE: Step (a) is not essential to removing  
the PTO belt, but it makes more room to work  
with the PTO belt.  
a. Adjust clutch disengagement (brake band  
adjustment) and check brake action.  
b. Loosen the brake band adjustment nut to  
allow the clutch idler pulley to drop down  
against the frame. This provides maxi-  
mum looseness of the belt to assist  
removal.  
b. Adjust clutch engagement for proper belt  
tension.  
Pull UP to Engage  
Engine  
Pulley  
Engine  
PTO Belt  
Blade Clutch Lever  
in the UP Position  
Clutch  
Linkage  
Clutch Idler  
Pulley  
Brake  
Band  
PTO Belt  
Tightener Arm  
PTO Drive  
Pulley  
Engine PTO Drive Belt Removal  
65  
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Maintenance Instructions  
REPLACING/REPAIRING  
Jackshaft Drive Belt  
b. Slide the idler arm release down to unlock  
the idler arm from the spring lever. Then  
pivot the arm up and away from the belt.  
1. To remove the jackshaft drive belt:  
a. Relax the belt by releasing spring tension  
from the jackshaft drive idler arm using the  
cold start lever.  
c. Roll the belt off the jackshaft pulley and  
remove.  
Idler Arm  
Release  
Jackshaft  
Drive Belt  
Cold Start Lever  
(Released)  
Jackshaft  
Pulley  
Spring Tension  
(Released)  
Ground Drive  
Idler Pulley (Disengaged)  
Engine Pulley  
Jackshaft Drive Belt (Disengaged)  
2. Reverse the removal procedure to replace the  
jackshaft drive belt.  
Idler Arm  
Release  
Jackshaft  
Drive Belt  
Cold Start Lever  
(Engaged)  
Jackshaft  
Pulley  
Spring Tension  
(Engaged)  
Ground Drive  
Idler Pulley (Engaged)  
Engine Pulley  
Jackshaft Drive Belt (Engaged)  
66  
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Maintenance Instructions  
REPLACING/REPAIRING  
GHS Blower Drive Belt  
1. Remove the GHS blower drive belt tension by  
depressing the idler pulley on the tightener arm.  
Roll the belt off the blower pulley. The belt  
should be clear of the blower pulley, allowing  
free movement of the blower wheel.  
Blower  
Pulley  
Blower Drive  
Pulley  
GHS Blower  
Drive Belt  
Belt Tightener  
Idler Pulley  
(Disengaged)  
GHS Blower Drive Belt Assembly (Disengaged)  
Blower Drive Belt Spring Removal  
2. Reverse the procedure to install the GHS blow-  
er drive belt and spring.  
Idler Pulley  
(Engaged)  
GHS Blower Drive Belt Assembly (Engaged)  
67  
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Maintenance Instructions  
REPLACING/REPAIRING  
Hydrostatic Ground Drive Belt  
b. Slide belt off pulleys, then release the  
idler.  
1. To remove the hydrostatic ground drive belt:  
a. Raise the spring-loaded belt tightener arm  
and idler pulley to relax belt.  
Jackshaft  
Spring  
Belt Tightener Arm  
Transmission  
Drive Pulley  
Idler Pulley  
Hydrostatic  
Ground Drive Belt  
Hydrostatic Ground Drive Belt Assembly (Disengaged)  
2. Reverse the procedure to install the hydrostatic  
ground drive belt.  
Belt Tightener Arm  
Spring  
Idler Pulley  
Hydrostatic  
Ground Drive Belt  
Hydrostatic Ground Drive Belt Assembly (Engaged)  
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Maintenance Instructions  
REPLACING/REPAIRING  
Engine Fan Belt  
b. Pivot the alternator as shown to relax and  
remove belt.  
1. To remove the fan belt:  
a. Loosen the alternator mounting pivot bolt  
and the alternator bracket tensioner bolt.  
Alternator  
Bracket  
Tensioner  
Bolt  
Engine  
Fan Belt  
Alternator  
Water Pump  
Pulley  
Crankshaft  
Pulley  
Engine Fan Belt (Loose)  
2. Reverse the procedure to install the belt. Ad-  
just and check the belt tension by referring to  
CHECKING/SERVICING the Fan Belt Tension  
in this section.  
Alternator  
Bracket  
Tensioner  
Bolt  
Engine  
Fan Belt  
Alternator  
Water Pump  
Pulley  
Crankshaft  
Pulley  
Engine Fan Belt (Tight)  
69  
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Maintenance Instructions  
REPLACING/REPAIRING  
Fuel Filter  
Blade Overload Shear Bolts  
Model MDD has two (2) fuel filters. Replace both  
the in-line filter and the Kubota filter element every  
400 hours of operation.  
NOTE: Shear bolts are not used on the DSD62  
mower deck.  
The cutting blade is keyed to the blade hub by two  
(2) shear bolts (10-24 x 5/8 in. stainless steel ma-  
chine screws). These bolts are designed to shear  
and protect the blade drive gearbox from damage if  
the blade encounters a shock load.  
Kubota  
Fuel Filter  
In-Line  
Filter  
Cold Start Lever  
(For Reference)  
Cutting Blade  
Shear Bolts  
Fuel Filter Location  
IMPORTANT: Replace fuel filters only in a  
clean area where the fuel line and connections  
will not be contaminated by dust and dirt.  
Cutting Blade Shear Bolts  
1. Close the fuel tank shut-off valve and the Kubota  
fuel filter cock.  
NOTE: Tightening the 5/8-18 blade mounting nut  
to 60 ft-lb (81.3 N·m) is also important for proper  
shock load protection. It is important to not over-  
tighten the mounting nut since this defeats (over-  
rides) the function of the shear bolts.  
2. Remove and replace the in-line filter; expand  
and slide clamps on either side of the filter away  
from filter and pull fuel lines off filter.  
If these bolts shear, remove the blade and install new  
bolts. Refer to CHECKING/SERVICING in this sec-  
tion for Sharpen Mower Bladeswhich describes the  
blade removal and installation procedure.  
3. Loosen the ring screw on the Kubota filter as-  
sembly, remove the filter pot and filter element.  
4. Clean the filter pot and reassemble the filter as-  
sembly with a new filter element (use only a  
Kubota replacement filter #15231-43560).  
After reinstalling the blade, check blade timing by  
moving blades through one (1) complete revolu-  
tion. Make sure blade tips pass clear of each other.  
If timing is incorrect, contact your Walker Dealer.  
5. Open the fuel filter cock and fuel tank shut-off  
valve.  
70  
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Maintenance Instructions  
REPLACING/REPAIRING  
PTO Shear Pin  
Mower Blades  
Mower blades are removed and remounted as de-  
scribed in Sharpen Mower Blades instructions (re-  
fer to CHECKING/SERVICING in this section).  
During the course of sharpening and inspecting  
mower blades, if there are any of the following  
conditions of wear or damage, blades should be  
replaced for reasons of safety and performance of  
the machine:  
The PTO drive shaft connection to the deck gearbox  
has a shear pin to provide shock load protection to  
the mower deck drive. This system provides prima-  
ry shock protection in case of blade impact and will  
normally shear before the individual shear bolts on  
the blade hub.  
When the PTO pin has sheared, use the following  
procedure to replace it:  
• An excessive amount of the flat section of the  
blade has been ground away (removed) when the  
blade is sharpened. Replace the blade when less  
than a 3/4 in. (19 mm) flat section remains at the  
blade tip.  
1. Loosen the two bolts securing the PTO shaft  
guard on the deck; lift the guard off. (Holes in  
guard are slotted for easy removal.)  
2. Rotate U-joint on shaft to align the shear pin  
hole with the hole (and shear pin fragment) in  
the shaft. Use a punch to drive the remaining  
portion of the old shear pin out.  
• Examine ends of the blade carefully, especially  
the intersection where the flat section of the blade  
turns up to form the “wing tip” (refer to CHECKING/  
SERVICING for Mower Blade Profile for Sharpen-  
ing illustration in Sharpen Mower Blades instruc-  
tions). Since sand and abrasive material can wear  
metal away in this area, the blade should be re-  
placed when metal thickness has worn to 1/16 in.  
(1.6 mm) or less.  
3. Install new shear pin and secure with cotter pin.  
Shear Pin  
DANGER  
Split Spring Pin  
When blades are operated over sandy  
soil, and if blades are allowed to wear, a  
“slot” may be worn into the wing tip of  
blade. Eventually a piece of the blade may  
break off creating a serious potential for  
injury or damage.  
U-Joint  
Tube Assembly  
U-Joint  
Shaft Assembly  
• Check the blades for straightness by marking  
blade tip position inside the deck housing and then  
rotating the opposite end of the blade to the same  
position and comparing. If the difference in blade tip  
track is more than 1/8 in. (3 mm), the blade is bent  
and should be replaced.  
Cotter Pin  
PTO Shear Pin  
IMPORTANT: Use only Walker P/N 8067-13  
shear pins for replacement to provide proper  
shock protection -- these pins are hardened to  
shear under a specific amount of load.  
• Inspect the blade surface, especially in formed ar-  
eas, for cracks. Replace the blade if any cracks are  
found.  
4. Reinstall the PTO shaft guard.  
WARNING  
Before operating the deck, inspect the blade over-  
load shear bolts and also check blade timing (on  
gear driven decks) by moving blades through one  
(1) complete revolution. Make sure blade tips  
pass clear of each other. If timing is incorrect, con-  
tact your Walker Dealer.  
DO NOT try to straighten a blade that is  
bent. NEVER weld a broken or cracked  
blade. ALWAYS replace with a new blade  
to assure safety.  
71  
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REPLACING/REPAIRING/  
ADJUSTMENTS  
Maintenance Instructions  
Reinstall the blades following procedure from  
SharpenMowerBladesinstructionsin CHECKING/  
SERVICING in this section. If blades are replaced,  
always use Walker original equipment blades to  
ensure safety and optimum performance. The  
quality and performance of replacement blades  
offered by other manufacturers cannot be  
guaranteed, they could be dangerous.  
Tilt-Up Deck Adjustable Stop  
When the carrier frame hinge joint is properly adjust-  
ed, the deck lock levers should move in and out of  
the engaged and disengaged positions freely. All  
four hitch pins used for height adjustment should sit  
flush on the washers above the deck pin bushing.  
On a level surface, if any pin is sticking up (likely the  
front pins), tighten the opposite side or loosen the ex-  
isting side to lower the pin. Adjustments are made by  
loosening the jam nut and tightening or loosening the  
set screws on the Deck Mount Pivot Brackets. Re-  
tighten the jam nut when the adjustment is complete.  
CAUTION  
ALWAYS use genuine factory replacement  
parts. Substitute parts CAN result in prod-  
uct malfunction and possible injury to the  
operator.  
Jam Nut  
ADJUSTMENTS  
Steering Levers  
An adjustment range of approximately 3 inches is  
available on the steering levers - the levers can be  
adjusted forward or aft depending on the arm length  
of the operator. The levers can be adjusted by loos-  
ening the locknut at the pivot point and the locknut  
holding the lever in position in the adjustment slide.  
Adjust levers into most comfortable position and  
tighten both locknuts.  
Set Screw  
Tilt-Up Deck Adjustable Stop  
GHS Signal Horn Adjustment  
(When Horn Sounds at Wrong Time)  
DANGER  
PINCH POINT - SPRING LOADED DOOR  
Adjustment  
When lowering the door on the GHS  
catcher, depress the safety latch on the  
side of the catcher. BE VERY CAREFUL to  
keep hands, fingers, etc. out of the hing-  
ing mechanism and away from the door  
frame as the door closes. The springs that  
hold the door closed during operation are  
very powerful, and the door can slam shut  
with considerable force.  
Slide  
Locknut  
(Position)  
Locknut  
(Pivot Point)  
The vertical position of the Grass-Pak® switch is crit-  
ical to make sure the catcher box does not overfill  
causing the delivery chute to clog. The vertical po-  
sition can be adjusted by bending the mounting  
bracket for the Grass-Pak® switch.  
Steering Lever Adjustment  
72  
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Maintenance Instructions  
ADJUSTMENTS  
1. Position the discharge chute so that it is point-  
ing straight back.  
3. If adjustment is required, hold the Grass-Pak®  
switch mount bracket firmly, grasp the switch  
and bracket and bend it down. Adjustments  
should be done in very small increments check-  
ing the measurement each time until the recom-  
mended measurement is achieved. This  
measurement is applicable to all catcher box  
sizes.  
a. Turn the ignition switch ON and move the  
blade clutch to the ENGAGED position  
(engine not running).  
b. Open the catcher back door and monitor  
the spout position (as it oscillates) and  
move the blade clutch to the DISEN-  
GAGED position and turn the ignition  
switch to the OFF position.  
NOTE: It will not be possible to adjust the switch to  
give a signal at the precise instant the catcher is full  
for a wide variety of mowing conditions. For exam-  
ple, wet heavy grass will fill the catcher differently  
than dry fluffy grass, causing the signal to come on  
a little sooner or later than usual. Primarily, the  
switch should be adjusted to give the “full” signal  
with a little advance warning before overfilling  
and clogging of the grass delivery chute begins (re-  
gardless of mowing conditions).  
WARNING  
DO NOT test the Grass-Pak® switch with  
the engine running. Projectiles CAN be  
thrown out of the grass delivery spout and  
CAN cause serious injury to bystanders or  
property damage.  
2. Measure from the exhaust screen (top of catch-  
er) to the top of the Grass-Pak® switch actuator  
vane, as shown. The proper measurement  
should be between 4 and 4-1/2 inches (10.16  
and 11.43 cm).  
Exhaust  
Screen  
4 to 4-1/2 in.  
Bend  
Point  
Adjusting the Grass-Pak® Switch  
(Side view of Catcher Box)  
73  
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74  
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LIMITED WARRANTY  
FOR  
WALKER  
COMMERCIAL RIDER MOWER  
1.  
WHAT THIS WARRANTY COVERS, AND FOR HOW LONG:  
Walker Manufacturing company will, at its option, repair or replace, without charge, any part covered by this warranty which  
is found to be defective in material and/or workmanship within one (1) year* after date of sale to the original retail pur-  
chaser unless the product is used for rental purposes, in which case this warranty is limited to ninety (90) days. At  
Walker’s request, customer will make the defective part available for inspection by Walker and/or return the defective part  
to Walker, transportation charges prepaid. All parts and components of the Walker Mower are covered by this warranty  
except the following components which are warranted separately by their respective manufacturers:  
Kohler Engine  
Kubota Engine  
Kawasaki Engine  
Eaton Hydraulic Transmission  
Peerless Gearboxes  
Battery  
Tires  
The available warranties covering these items are furnished with each mower. Walker does not assume any warranty obli-  
gation, liability or modification for these items, which are covered exclusively by the stated warranty of the respective man-  
ufacturers noted above.  
* An extended three (3) year warranty is offered on the Walker P/N 6200-9 Gear Axle Assembly.  
2.  
WHAT THIS WARRANTY DOES NOT COVER:  
A.  
B.  
This warranty does not cover defects caused by depreciation or damage caused by normal wear, accidents, improper  
maintenance, improper use or abuse of the product, alterations, or failure to follow the instructions contained in the  
Owner’s Manual for operation and maintenance.  
The customer shall pay any charges for making service calls and/or for transporting the mower to and from the place  
where the inspection and/or warranty work is performed.  
3.  
4.  
HOW TO OBTAIN SERVICE UNDER THIS WARRANTY:  
Warranty service can be arranged by contacting the dealer where you purchased the mower or by contacting Walker Man-  
ufacturing Company, 5925 East Harmony Road, Ft. Collins, CO 80528. Proof of the date of purchase may be required to  
verify warranty coverage.  
WARRANTY LIMITATION:  
A.  
THERE IS NO OTHER EXPRESS WARRANTY. ANY WARRANTY THAT MAY BE IMPLIED FROM THIS  
PURCHASE INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IS HEREBY  
LIMITED TO THE DURATION OF THIS WARRANTY AND TO THE EXTENT PERMITTED BY LAW ANY AND ALL  
IMPLIED WARRANTIES ARE EXCLUDED. Some states do not allow limitations on how long an implied warranty  
lasts, so the above limitations may not apply to you.  
B.  
WALKER WILL NOT BE LIABLE FOR ANY INCIDENTAL, CONSEQUENTIAL, OR SPECIAL DAMAGES AND/OR  
EXPENSES IN CONNECTION WITH THE PURCHASE OR USE OF THE MOWER. Some states do not allow the  
exclusion or limitation of incidental or consequential damages, so the above limitation(s) or exclusion(s) may not  
apply to you.  
C. Only the warranty expressed in this limited warranty shall apply and no dealer, distributor, or individual is authorized  
to amend, modify, or extend this warranty in any way. Accordingly, additional statements such as dealer advertising  
or presentations, whether oral or written, do not constitute warranties by Walker, and should not be relied upon.  
D. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.  
75  
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Vibration - Model MDD  
Sound - Model MDD  
Vibration Level  
Sound Test  
Vibration levels at the operators handles  
were measured in the vertical, lateral, and  
longitudinal directions using calibrated vibra-  
tion test equipment.  
Sound test conducted was in accordance  
with 79/113/EEC and was performed on 28  
January 98 under the conditions listed:  
Lwa  
105  
0.8g  
Tests were performed on 28 January 98  
under the conditions listed:  
General Condition:  
Temperature:  
Wind Speed:  
Humidity:  
Cloudy  
LpA  
32 (F)o 0 (C)o  
< 5 mph (< 8 kmh)  
58%  
93  
OPERATOR  
General Condition:  
Cloudy  
Temperature:  
Wind Speed:  
Humidity:  
32 (F)o 0 (C)o  
< 5 mph (< 8 kmh)  
58%  
B a r o m e t r i c P r e s s u r e : 2 5 . 0 " H G ( 6 3 6 m m H g )  
Barometric Pressure: 25.0" HG (636 mm Hg)  
WALKER MFG. CO. • 5925 E. HARMONY ROAD, FORT COLLINS, CO 80528 • (970) 221-5614  
FORM NO. 021505  
PRINTED IN USA  
©2005 WALKER MFG. CO  
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