GR29
UNDERWATER
HYDRAULIC
GRINDER
Safety, OperatiOn and Maintenance
USer ManUaL
© 2010 Stanley Black & Decker, Inc.
New Britain, CT 06053
U.S.A.
66486 5/2013 Ver. 6
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TABLE OF CONTENTS
DECLARATION OF CONFORMITY..........................................................................................................................2
SAFETY SYMBOLS ..................................................................................................................................................4
SAFETY PRECAUTIONS..........................................................................................................................................5
TOOL STICKERS & TAGS........................................................................................................................................7
HOSE TYPES............................................................................................................................................................8
HOSE RECOMMENDATIONS ..................................................................................................................................9
FIGURE 1. TYPICAL HOSE CONNECTIONS.......................................................................................................9
HTMA REQUIREMENTS.........................................................................................................................................10
OPERATION............................................................................................................................................................ 11
TOOL PROTECTION & CARE................................................................................................................................13
TROUBLESHOOTING ............................................................................................................................................14
ACCESSORIES.......................................................................................................................................................15
SPECIFICATIONS...................................................................................................................................................15
GR29 PARTS ILLUSTRATION................................................................................................................................16
GR29 PARTS LIST..................................................................................................................................................17
IMPORTANT
To fill out a Product Warranty Recording form, and for information on your warranty,
visit Stanleyhydraulic.com and select the Warranty tab.
(NOTE: The warranty recording form must be submitted to validate the warranty).
SERVICING THE STANLEY HYDRAULIC GRINDER. This manual contains safety, operation, and routine mainte-
nance instructions. Servicing of hydraulic tools, other than routine maintenance, must be performed by an autho-
rized and certified dealer. Please read the following warning.
WARNING
SERIOUS INJURY OR DEATH COULD RESULT FROM THE IMPROPER REPAIR OR
SERVICE OF THIS TOOL.
REPAIRS AND / OR SERVICE TO THIS TOOL MUST ONLY BE DONE BY AN
AUTHORIZED AND CERTIFIED DEALER.
For the nearest authorized and certified dealer, call Stanley Hydraulic Tools at the number listed on the back of this
manual and ask for a Customer Service Representative.
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SAFETY SYMBOLS
Safety symbols and signal words, as shown below, are used to emphasize all operator, maintenance and repair ac-
tions which, if not strictly followed, could result in a life-threatening situation, bodily injury or damage to equipment.
This is the safety alert symbol. It is used to alert you to potential personal injury
hazards. Obey all safety messages that follow this symbol to avoid possible
injury or death.
This safety alert and signal word indicate an imminently hazardous situation
which, if not avoided, will result in death or serious injury.
DANGER
WARNING
CAUTION
This safety alert and signal word indicate a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
This safety alert and signal word indicate a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
This signal word indicates a potentially hazardous situation which, if not avoid-
ed, may result in property damage.
CAUTION
NOTICE
This signal word indicates a situation which, if not avoided, will result in damage
to the equipment.
This signal word indicates a situation which, if not avoided, may result in dam-
age to the equipment.
IMPORTANT
Always observe safety symbols. They are included for your safety and for the protection of the tool.
LOCAL SAFETY REGULATIONS
Enter any local safety regulations here. Keep these instructions in an area accessible to the operator and mainte-
nance personnel.
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SAFETY PRECAUTIONS
Tool operators and maintenance personnel must always
comply with the safety precautions given in this manual
and on the stickers and tags attached to the tool and
hose.
incompletely assembled tool.
•
To avoid personal injury or equipment damage, all
tool repair, maintenance and service must only be
performed by authorized and properly trained per-
sonnel.
These safety precautions are given for your safety. Re-
view them carefully before operating the tool and before
performing general maintenance or repairs.
•
•
•
Always replace parts with replacement parts recom-
mended by Stanley Hydraulic Tools.
Supervising personnel should develop additional pre-
cautions relating to the specific work area and local
safety regulations. If so, place the added precautions in
the space provided in this manual.
Check fastener tightness often and before each use
daily.
Do not tighten or loosen the wheel nut by impact.
Hold the shaft with a second wrench on the the flats
behind the wheel and tighten securely.
The GR29 Hydraulic Grinder will provide safe and de-
pendable service if operated in accordance with the in-
structions given in this manual. Read and understand
this manual and any stickers and tags attached to the
tool and hoses before operation. Failure to do so could
result in personal injury or equipment damage.
•
•
•
•
Do not overreach. Maintain proper footing and bal-
ance at all times.
Always hold the tool with both hands when the unit
is running. Use a firm grip.
Keep all parts of your body away from the rotating
wheel.
Do not wear loose clothing or unbound long hair
when operating the tool. Loose items can get en-
tangled with the tool and cause serious injury.
•
Operator must start in a work area without bystand-
ers. The operator must be familiar with all prohibited
work areas such as excessive slopes and danger-
ous terrain conditions.
•
•
Supply hoses must have a minimum working pres-
sure rating of 2500 psi/175 bar.
The hydraulic circuit control valve must be in the
“OFF” position when coupling or uncoupling the tool.
Wipe all couplers clear before connecting. Failure to
do so may result in damage to the quick couplers
and cause overheating. Use only lint-free cloths.
•
•
•
•
Establish a training program for all operators to en-
sure safe operation.
Do not operate this tool without first reading this
manual.
•
•
•
Do not exceed the rated limits of the tool or use the
tool for applications beyond its design capacity.
Do not operate the tool unless thoroughly trained or
under the supervision of an instructor.
Always keep critical tool markings, such as labels
and warning stickers, legible.
Always wear safety equipment such as goggles,
gloves, safety shoes, ear, breathing and head pro-
tection at all times when operating the tool.
Warning: Use of this tool on certain materials during
demolition could generate dust potentially contain-
ing a variety of hazardous substances such as as-
bestos, silica or lead. Inhalation of dust containing
these or other hazardous substances could result
in serious injury, cancer or death. Protect yourself
and those around you. Research and understand
the materials you are cutting. Follow correct safety
procedures and comply with all applicable national,
state or provisional health and safety regulations
relating to them, including, if appropriate arranging
for the safe disposal of the materials by a qualified
person.
•
•
•
Do not inspect or clean the tool while the hydraulic
power source is connected. Accidental engagement
of the tool can cause serious injury.
Always connect hoses to the tool hose couplers be-
fore energizing the hydraulic power source. Be sure
all hose connections are tight.
Do not operate the tool at oil temperatures above
140 °F/60 °C. Operation at higher temperatures can
cause higher than normal temperatures at the tool
which can result in operator discomfort and may
cause damage to the tool.
•
Do not operate a damaged, improperly adjusted, or
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SAFETY PRECAUTIONS
•
•
Warning: Hydraulic fluid under pressure could cause
skin injection injury. If you are injured by hydraulic
fluid, get medical attention immediately.
•
•
•
Do not use a wheel that is cracked or otherwise
damaged.
Always use wheels that conform to the specifica-
tions given in the Operation section of this manual.
Keep the wheel off all surfaces when starting the
grinder.
Do not reverse wheel rotation direction by changing
fluid flow direction.
•
•
Always carry the tool with the wheel stopped.
Make sure the wheel has stopped before setting
down the tool.
•
•
Always support and secure items being worked on.
Caution when handling the work piece after grind-
ing, object can be hot and have sharp edges, use
your personal protection equipment.
•
•
Keep the handles clean and free of fluid at all times.
Always inspect wheels for possible damage before
installation.
•
Keep your work area clean and clear of tripping haz-
ards, oily surfaces and hoses laying about can be
hazardous.
•
•
•
•
•
•
•
Never transport or store the tool with the wheel
mounted on the grinder.
•
•
Make sure adequate lighting is always available.
Never cock, jam or wedge the wheel during opera-
tion.
Never operate the tool if you cannot be sure that
underground utilities are not present. Underground
electrical utilities present an electrocution hazard.
Underground gas utilities present an explosion haz-
ard. Other underground utilities may present other
hazards.
Never cause sparks in the vicinity of flammable ma-
terials.
Do not operate the tool with the wheel guard re-
moved.
Do not start grinding until you have a clear work
area and secure footing.
•
•
Do not operate this tool in a potentially explosive en-
vironment. Do not grind on vessels containing com-
bustible substances.
Do not allow other persons near the tool when start-
ing or cutting.
Any use of this tool outside those stated in this man-
ual are forbidden.
Never operate the tool when you are tired or fa-
tigued.
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TOOL STICKERS & TAGS
28811
Information Plaque
28409
Composite Decal
28322
CE Decal
E
40 LPM @ 138 BAR
EHTMA CATEGORY
12535
WARNING
Circuit Type E Decal
Grinding Wheel and Jam
nut must be tightened with
a wrench before use.
10396
Warning Decal
CAUTION
PROTECT YOUR EYES
WEAR SAFETY GOGGLES
Do not use damaged wheels use
full throttle only while grinding.
Use only reinforced resinoid
wheels rated for 6500 RPM
minimum 9 inch diameter by inch
thick maximum. Inspect wheel
guard for signs of damage after
any wheel failure.
11206
Circuit Type C Decal
D A N G E R
D A N G E R
1. FAILURE TO USE HYDRAULIC HOSE LABELED AND CERTI-
FIED AS NON-CONDUCTIVE WHEN USING HYDRAULIC
TOOLS ON OR NEAR ELECTRICAL LINES MAY RESULT IN
DEATH OR SERIOUS INJURY.
D. DO NOT LIFT OR CARRY TOOL BY THE HOSES. DO
NOT ABUSE HOSE. DO NOT USE KINKED, TORN OR
DAMAGED HOSE.
08688
Safety Decal
3. MAKE SURE HYDRAULIC HOSES ARE PROPERLY CON-
NECTED TO THE TOOL BEFORE PRESSURING SYSTEM.
SYSTEM PRESSURE HOSE MUST ALWAYS BE CON-
NECTED TO TOOL “IN” PORT. SYSTEM RETURN HOSE
MUST ALWAYS BE CONNECTED TO TOOL “OUT” PORT.
REVERSING CONNECTIONS MAY CAUSE REVERSE
TOOL OPERATION WHICH CAN RESULT IN SEVERE
PERSONAL INJURY.
BEFORE USING HOSE LABELED AND CERTIFIED AS NON-
CONDUCTIVE ON OR NEAR ELECTRIC LINES BE SURE THE
HOSE IS MAINTAINED AS NON-CONDUCTIVE. THE HOSE
SHOULD BE REGULARLYTESTED FOR ELECTRIC CURRENT
LEAKAGE IN ACCORDANCE WITH YOUR SAFETY DEPART-
MENT INSTRUCTIONS.
4-12 GPM / 15-45 LPM
DO NOT EXCEED 2000 PSI / 140 BAR
2. A HYDRAULIC LEAK OR BURST MAY CAUSE OIL INJECTION
INTO THE BODY OR CAUSE OTHER SEVERE PERSONAL
INJURY.
DO NOT EXCEED SPECIFIED FLOW OR PRESSURE
USE CLOSED-CENTER TOOL ON CLOSED-CENTER
SYSTEM. USE OPEN-CENTER TOOL ON OPEN-CENTER
SYSTEM. CORRECTLY CONNECT HOSES TO TOOL “IN”
AND “OUT” PORTS. IMPROPER HANDLING, USE OR OTHER
MAINTENANCE OF TOOL COULD RESULT IN A LEAK, BURST
OR OTHER TOOL FAILURE. CONTACT AT A LEAK OR BURST
CAN CAUSE OIL INJECTION INTO THE BODY. FAILURE TO
OBSERVE THESE PRECAUTIONS CAN RESULT IN SERIOUS
PERSONAL INJURY.
4. DO NOT CONNECT OPEN-CENTER TOOLS TO CLOSED-
CENTER HYDRAULIC SYSTEMS. THIS MAY RESULT IN
LOSS OF OTHER HYDRAULIC FUNCTIONS POWERED BY
THE SAME SYSTEMAND/OR SEVERE PERSONAL INJURY.
A. DO NOT EXCEED SPECIFIED FLOW AND PRESSURE
FOR THIS TOOL. EXCESS FLOW OR PRESSURE MAY
CAUSE A LEAK OR BURST.
5. BYSTANDERS MAY BE INJURED IN YOUR WORK AREA.
KEEP BYSTANDERS CLEAR OF YOUR WORK AREA.
B. DO NOT EXCEED RATED WORKING PRESSURE OF
HYDRAULIC HOSE USED WITH THIS TOOL. EXCESS
PRESSURE MAY CAUSE A LEAK OR BURST.
6. WEAR HEARING, EYE, FOOT, HAND AND HEAD PRO-
TECTION.
7. TO AVOID PERSONAL INJURY OR EQUIPMENT DAMAGE,
ALL TOOL REPAIR MAINTENANCE AND SERVICE MUST
ONLY BE PERFORMED BY AUTHORIZED AND PROPERLY
TRAINED PERSONNEL.
C. CHECK TOOL HOSE COUPLERS AND CONNECTORS
DAILY FOR LEAKS. DO NOT FEEL FOR LEAKS WITH
YOUR HANDS. CONTACT WITH A LEAK MAY RESULT
IN SEVERE PERSONAL INJURY.
03788
GPM Decal
I M P O R T A N T
I M P O R T A N T
READ OPERATION MANUAL AND
SAFETY INSTRUCTIONS FOR THIS
TOOL BEFORE USING IT.
READ OPERATION MANUAL AND
SAFETY INSTRUCTIONS FOR THIS
TOOL BEFORE USING IT.
The safety tag (p/n 15875) at right is attached
to the tool when shipped from the factory. Read
and understand the safety instructions listed on
this tag before removal. We suggest you retain
this tag and attach it to the tool when not in use.
USE ONLY PARTS AND REPAIR
PROCEDURES APPROVED BY
STANLEY AND DESCRIBED IN THE
OPERATION MANUAL.
USE ONLY PARTS AND REPAIR
PROCEDURES APPROVED BY
STANLEY AND DESCRIBED IN THE
OPERATION MANUAL.
TAG TO BE REMOVED ONLY BY
TOOL OPERATOR.
TAG TO BE REMOVED ONLY BY
TOOL OPERATOR.
SEE OTHER SIDE
SEE OTHER SIDE
SAFETY TAG P/N 15875 (shown smaller then actual size)
GR29 User Manual ◄ 7
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HOSE TYPES
The rated working pressure of the hydraulic hose must be equal to or higher than the relief valve setting on the hy-
draulic system. There are three types of hydraulic hose that meet this requirement and are authorized for use with
Stanley Hydraulic Tools. They are:
Certified non-conductive — constructed of thermoplastic or synthetic rubber inner tube, synthetic fiber braid
reinforcement, and weather resistant thermoplastic or synthetic rubber cover. Hose labeled certified non-
conductive is the only hose authorized for use near electrical conductors.
Wire-braided (conductive) — constructed of synthetic rubber inner tube, single or double wire braid reinforce-
ment, and weather resistant synthetic rubber cover. This hose is conductive and must never be used near
electrical conductors.
Fabric-braided (not certified or labeled non-conductive) — constructed of thermoplastic or synthetic rubber in-
ner tube, synthetic fiber braid reinforcement, and weather resistant thermoplastic or synthetic rubber cover. This
hose is not certified non-conductive and must never be used near electrical conductors.
HOSE SAFETY TAGS
To help ensure your safety, the following DANGER tags are attached to all hose purchased from Stanley Hydraulic
Tools. DO NOT REMOVE THESE TAGS.
If the information on a tag is illegible because of wear or damage, replace the tag immediately. A new tag may be
obtained from your Stanley Distributor.
THE TAG SHOWN BELOW IS ATTACHED TO “CERTIFIED NON-CONDUCTIVE” HOSE
D A N G E R
D A N G E R
1. FAILURE TO USE HYDRAULIC HOSE LABELED AND CERTIFIED AS NON-CONDUCTIVE
WHEN USING HYDRAULIC TOOLS ON OR NEAR ELECTRIC LINES MAY RESULT IN
DEATH OR SERIOUS INJURY.
3. DO NOT EXCEED HOSE WORKING PRESSURE OR ABUSE HOSE. IMPROPER USE
OR HANDLING OF HOSE COULD RESULT IN BURST OR OTHER HOSE FAILURE.
KEEP HOSE AS FAR AWAY AS POSSIBLE FROM BODY AND DO NOT PERMIT DIRECT
CONTACT DURING USE. CONTACT AT THE BURST CAN CAUSE BODILY INJECTION
AND SEVERE PERSONAL INJURY.
FOR PROPER AND SAFE OPERATION MAKE SURE THAT YOU HAVE BEEN PROP-
ERLY TRAINED IN CORRECT PROCEDURES REQUIRED FOR WORK ON OR AROUND
ELECTRIC LINES.
4. HANDLE AND ROUTE HOSE CAREFULLY TO AVOID KINKING, ABRASION, CUTTING, OR
CONTACT WITH HIGH TEMPERATURE SURFACES. DO NOT USE IF KINKED. DO NOT
USE HOSE TO PULL OR LIFT TOOLS, POWER UNITS, ETC.
2. BEFORE USING HYDRAULIC HOSE LABELED AND CERTIFIED AS NON-CONDUCTIVE
ON OR NEAR ELECTRIC LINES. WIPE THE ENTIRE LENGTH OF THE HOSE AND FIT-
TING WITH A CLEAN DRY ABSORBENT CLOTH TO REMOVE DIRT AND MOISTURE AND
TEST HOSE FOR MAXIMUM ALLOWABLE CURRENT LEAKAGE IN ACCORDANCE WITH
SAFETY DEPARTMENT INSTRUCTIONS.
5. CHECK ENTIRE HOSE FOR CUTS CRACKS LEAKS ABRASIONS, BULGES, OR DAM-
AGE TO COUPLINGS IF ANY OF THESE CONDITIONS EXIST, REPLACE THE HOSE
IMMEDIATELY. NEVER USE TAPE OR ANY DEVICE TO ATTEMPT TO MEND THE HOSE.
6. AFTER EACH USE STORE IN A CLEAN DRY AREA.
SEE OTHER SIDE
SEE OTHER SIDE
SIDE 1
SIDE 2
(Shown smaller than actual size)
THE TAG SHOWN BELOW IS ATTACHED TO “CONDUCTIVE” HOSE.
D A N G E R
D A N G E R
1. DO NOT USE THIS HYDRAULIC HOSE ON OR NEAR ELECTRIC LINES. THIS HOSE IS
NOT LABELED OR CERTIFIED AS NON-CONDUCTIVE. USING THIS HOSE ON OR NEAR
ELECTRICAL LINES MAY RESULT IN DEATH OR SERIOUS INJURY.
5. CHECK ENTIRE HOSE FOR CUTS CRACKS LEAKSABRASIONS, BULGES, OR DAMAGE TO
COUPLINGS IF ANY OF THESE CONDITIONS EXIST, REPLACE THE HOSE IMMEDIATELY.
NEVER USE TAPE OR ANY DEVICE TO ATTEMPT TO MEND THE HOSE.
2. FOR PROPER AND SAFE OPERATION MAKE SURE THAT YOU HAVE BEEN PROPERLY
TRAINED IN CORRECT PROCEDURES REQUIRED FOR WORK ON OR AROUND ELEC-
TRIC LINES.
6. AFTER EACH USE STORE IN A CLEAN DRY AREA.
3. DO NOT EXCEED HOSE WORKING PRESSURE ORABUSE HOSE. IMPROPER USE OR HAN-
DLING OF HOSE COULD RESULT IN BURST OR OTHER HOSE FAILURE. KEEP HOSEAS FAR
AWAY AS POSSIBLE FROM BODY AND DO NOT PERMIT DIRECT CONTACT DURING USE.
CONTACTATTHE BURST CAN CAUSE BODILY INJECTIONAND SEVERE PERSONALINJURY.
4. HANDLE AND ROUTE HOSE CAREFULLY TO AVOID KINKING, CUTTING, OR CONTACT
WITH HIGH TEMPERATURE SURFACES. DO NOT USE IF KINKED. DO NOT USE HOSE TO
PULL OR LIFT TOOLS, POWER UNITS, ETC.
SEE OTHER SIDE
SEE OTHER SIDE
SIDE 1
SIDE 2
(Shown smaller than actual size)
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HOSE RECOMMENDATIONS
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HTMA REQUIREMENTS
HTMA / EHTMA REQUIREMENTS
HTMA
TOOL TYPE
HYDRAULIC SYSTEM REQUIREMENTS
TYPE I
TYPE II
TYPE RR
9-10.5 gpm
(34-40 lpm)
1500 psi
TYPE III
11-13 gpm
(42-49 lpm)
1500 psi
4-6 gpm
7-9 gpm
Flow Range
(15-23 lpm)
1500 psi
(103 bar)
(26-34 lpm)
1500 psi
(103 bar)
Nominal Operating Pressure
(at the power supply outlet)
(103 bar)
(103 bar)
2100-2250 psi
(145-155 bar)
2100-2250 psi
(145-155 bar)
2200-2300 psi
(152-159 bar)
2100-2250 psi
(145-155 bar)
System relief valve setting
(at the power supply outlet)
250 psi
(17 bar)
250 psi
(17 bar)
250 psi
(17 bar)
250 psi
(17 bar)
Maximum back pressure
(at tool end of the return hose)
400 ssu*
400 ssu*
400 ssu*
400 ssu*
Measured at a max. fluid viscosity of:
(82 centistokes) (82 centistokes) (82 centistokes) (82 centistokes)
(at min. operating temperature)
Temperature: Sufficient heat rejection
capacity to limit max. fluid temperature to:
(at max. expected ambient temperature)
140° F
(60° C)
140° F
(60° C)
140° F
(60° C)
140° F
(60° C)
Min. cooling capacity at a temperature
3 hp
5 hp
6 hp
7 hp
difference of between ambient and fluid
temps
(2.24 kW)
40° F
(3.73 kW)
40° F
(5.22 kW)
40° F
(4.47 kW)
40° F
NOTE:
(22° C)
(22° C)
(22° C)
(22° C)
Do not operate the tool at oil temperatures above 140° F (60° C). Operation at higher temperatures can cause operator
discomfort at the tool.
Filter
25 microns
30 gpm
(114 lpm)
25 microns
30 gpm
(114 lpm)
25 microns
30 gpm
(114 lpm)
25 microns
30 gpm
(114 lpm)
Min. full-flow filtration
Sized for flow of at least:
(For cold temp. startup and max.
dirt-holding capacity)
Hydraulic fluid Petroleum based
(premium grade, anti-wear, non-conductive)
Viscosity (at min. and max. operating temps)
100-400 ssu*
100-400 ssu*
(20-82 centistokes)
100-400 ssu*
100-400 ssu*
NOTE:
When choosing hydraulic fluid, the expected oil temperature extremes that will be experienced in service determine the
most suitable temperature viscosity characteristics. Hydraulic fluids with a viscosity index over 140 will meet the requirements
over a wide range of operating temperatures.
*SSU = Saybolt Seconds Universal
CLASSIFICATION
EHTMA
HYDRAULIC SYSTEM
REQUIREMENTS
C
B
D
Flow Range
3.5-4.3 gpm
(13.5-16.5 lpm) (18-22 lpm)
1870 psi
(129 bar)
4.7-5.8 gpm
7.1-8.7 gpm
(27-33 lpm)
1500 psi
9.5-11.6 gpm
(36-44 lpm)
1500 psi
11.8-14.5 gpm
(45-55 lpm)
1500 psi
Nominal Operating Pressure
(at the power supply outlet)
1500 psi
(103 bar)
(103 bar)
(103 bar)
(103 bar)
System relief valve setting
(at the power supply outlet)
2495 psi
(172 bar)
2000 psi
(138 bar)
2000 psi
(138 bar)
2000 psi
(138 bar)
2000 psi
(138 bar)
NOTE: These are general hydraulic system requirements. See tool specification page for tool specific requirements
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OPERATION
PREOPERATION PROCEDURES
CHECK THE POWER SOURCE
IMPORTANT
1. Using a calibrated flowmeter and pressure gauge,
check that the hydraulic power source develops a
flow of 4-12 gpm/15-45 lpm at 950-2000 psi/67-140
bar.
Never over-tighten the grinding wheel jam nut by
impacting either wrench with a mallet or hammer.
Sufficient torque is attained by hand-tightening the
nut with two open-end wrenches.
2. Make certain that the hydraulic power source is
equipped with a relief valve set to open at 2100-
2250 psi/145-155 bar minimum.
USE OF DEPRESSED-CENTER WHEEL
ADAPTER
3. Check that the hydraulic circuit matches the tool for
open-center (OC) or closed-center (CC) operation.
The Depressed-Center Wheel Adapter (part number
05194) must be used with wheels having a cupped or
depressed center.
CHECK THE TOOL
1. Make sure all tool accessories are correctly in-
stalled. Failure to install tool properly can result in
damage to the tool or personal injury.
CONNECT HOSES
1. Wipe all hose couplers with a clean lint-free cloth
2. There should be no signs of leaks.
before making connections.
3. The tool should be clean, with all fittings and fasten-
2. Connect the hoses from the hydraulic power source
to the tool fittings or quick disconnects. It is good
practice to connect return hoses first and discon-
nect them last to minimize or avoid trapped pressure
within the tool.
ers tight.
CHECK TRIGGER MECHANISM
1. Check that the trigger operates smoothly and is free
to travel between the “ON” and “OFF” positions.
3. Observe the arrow on the couplers to ensure that
the flow is in the proper direction. The female cou-
pler on the tool is the inlet (pressure) coupler.
2. Check that the trigger is set to disengage the grinder
when released.
CHECK HANDLE
4. Move the hydraulic circuit control valve to the “ON”
Check that the cross handle is securely screwed into the
position to operate the tool.
handle bracket. Remove any oil from the handle.
5. Squeeze the grinder trigger momentarily. If the
grinder does not operate, the hoses might be re-
versed. Verify correct connection of the hoses be-
fore continuing.
CHECK AND ADJUST WHEEL GUARD
1. Inspect the wheel guard for cracks and other struc-
tural damage.
NOTE:
2. If necessary, adjust the position of the wheel guard
by loosening the two capscrews on the guard clamp.
Make sure the capscrews are tightened securely af-
ter adjustment.
If uncoupled hoses are left in the sun, pressure in-
crease inside the hose may make them difficult to
connect. Whenever possible, connect the free ends
of the hoses together.
INSTALLING AND REMOVING GRINDING
WHEEL
1. Remove and set aside the jam nut from the output
shaft.
2. Position the grinding wheel over the shaft.
3. Screw the jam nut down onto the spindle shaft.
Tighten the nut securely by using two open-end
wrenches, one wrench on the flats of the spindle
shaft, the other wrench on the jam nut.
4. Remove the grinding wheel by loosening the jam nut
as in Step 3.
GR29 User Manual ◄ 11
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OPERATION
TOOL OPERATION
COLD WEATHER OPERATION
For best results, use only Stanley approved accesso- If the grinder is to be used during cold weather, preheat
ries. They have been designed and selected to get the the hydraulic fluid at low engine speed. When using the
most from the tool.
normally recommended fluids, fluid temperature should
be at or above 50 °F/10 °C (400 ssu/82 centistokes) be-
fore use.
Review the Safety Precautions given at the front of this
manual before operating the tool.
Damage to the hydraulic system or grinder can result
from use with fluid that is to viscous or too thick.
Remember to grip the tool with both hands at all times
during startup and operation and be sure you have full
balance before starting grinder rotation. Always keep
your body away from the “plane of rotation” of the grind-
ing wheel.
Always start the grinder with the wheel away from the
work surface. Start hydraulic flow at one gpm and slowly
increase flow to a level that produces desired efficiency,
but allows the operator to maintain full balance and con-
trol.
WARNING
Starting the hydraulic grinder on the work with full
hydraulic flow can push the operator off balance,
creating a condition that can cause severe
personal injury.
Refer to the Troubleshooting section of this manual to
isolate other possible conditions that can lower tool effi-
ciency.
12 ► GR29 User Manual
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TOOL PROTECTION & CARE
NOTICE
In addition to the Safety Precautions found in
this manual, observe the following for equipment
protection and care.
•
•
Make sure all couplers are wiped clean before con-
nection.
•
Do not exceed the rated flow (see Specifications)
page in this manual for correct flow rate and model
number. Rapid failure of the internal seals may re-
sult.
The hydraulic circuit control valve must be in the
“OFF” position when coupling or uncoupling hydrau-
lic tools. Failure to do so may result in damage to
the quick couplers and cause overheating of the hy-
draulic system.
•
•
•
•
Always keep critical tool markings, such as warning
stickers and tags legible.
Tool repair should be performed by experienced
personnel only.
•
•
Always store the tool in a clean dry space, safe from
damage or pilferage.
Make certain that the recommended relief valves
are installed in the pressure side of the system.
Make sure the circuit PRESSURE hose (with male
quick disconnect) is connected to the “IN” port. The
circuit RETURN hose (with female quick disconnect)
is connected to the opposite port. Do not reverse cir-
cuit flow. This can cause damage to internal seals.
Do not use the tool for applications for which it was
not intended.
•
Always replace hoses, couplings and other parts
with replacement parts recommended by Stanley
Hydraulic Tools. Supply hoses must have a mini-
mum working pressure rating of 2500 psi/172 bar.
GR29 User Manual ◄ 13
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TROUBLESHOOTING
If symptoms of poor performance develop, the following chart can be used as a guide to correct the problem. When
diagnosing faults in operation of the grinder, always make sure the hydraulic power source is supplying the correct
hydraulic flow and pressure to the tool as listed in the table. Use a flowmeter known to be accurate. Check the flow
with the hydraulic fluid temperature at least 80 °F/27 °C.
PROBLEM
CAUSE
SOLUTION
Low performance.
Incorrect hydraulic flow.
Check that the power source is pro-
ducing 4–12 gpm/15–45 lpm at
1000–2000 psi/70–140 bar.
Defective quick disconnects.
Check quick disconnects.
Fluid leaks at motor cap assem- Fasteners loose.
bly face.
Tighten to recommended torque
value.
Face O-ring worn or missing.
Replace as required.
Motor cap assembly/main housing Replace as required.
damaged.
Fluid leaks at reversing spool.
Damaged O-rings.
Replace as required. Refer to assem-
bly instructions to prevent cutting the
O-rings.
Wrong hydraulic fluid. Circuit too hot.
See Hydraulic System Requirements
for correct fluid/circuit specifications.
Hydraulic pressure and return re- Correct hose connections.
versed.
Fluid gets hot, power unit work- Open-center tool on a closed-center Use tool to match circuit.
ing hard.
circuit and vice versa.
Too much fluid going through tool.
Adjust flow for 12 gpm/34 lpm maxi-
mum.
Circuit is generating high heat with flow Use pump size and rpm for produc-
controls, open relief valve, etc.
ing needed flow only. Eliminate circuit
heating cause.
Circuit has contaminants that have Replace worn pump and valves. In-
caused pump and valve wear and high stall a large clean filter and keep cir-
heat generation.
cuit fluid clean.
Tool doesn’t run.
Power unit not functioning.
Check that the power source is pro-
ducing 4–12 gpm/15–45 lpm at
1000–2000 psi/70–140 bar.
Coupler or hoses blocked.
Mechanical failure.
Remove obstruction.
Disassemble tool and inspect for
damage.
Tool runs backwards.
Pressure and return hoses reversed.
Correct for proper flow direction.
Grinding wheel should rotate counter-
clockwise when viewed from the shaft
end.
Grinding wheel comes to abrupt Porting spool incorrectly assembled.
stop after trigger is released.
Refer to Service Manual.
Check valve in trigger spool not func- Replace trigger spool assembly.
tioning correctly.
Check valve not serviceable.
Mechanical failure.
Disassemble tool and inspect for
damage.
14 ► GR29 User Manual
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SPECIFICATIONS
Capacity.................................................................................................. 9 in./23 cm Wheel on 5/8 in. -11 THD Arbor
Weight (with Wheel Guard) ..................................................................................................................15 lbs/6387 kg
Length........................................................................................................................................................ 9 in./23 cm
Width (without Wheel Guard) ........................................................................................................... 4-1/2 in./11.5 cm
Pressure...........................................................................................................................1000–2500 psi/70–175 bar
Flow Range ...............................................................................................................................4–12 gpm/15–45 lpm
Optimum Flow .................................................................................................................2700 rpm at 10 gpm/38 lpm
Porting...................................................................................................................................................-8 SAE O-ring
Connect Size and Type ........................................................................................................ (2) 3/8 in. NPT Adapters
Hose Whips............................................................................................................................................................ No
Motor ...............................................................................................................................................................Integral
SOUND POWER AND VIBRATION DECLARATION
Test conducted on GR29310, S/N 1989 operated at standard 10 gpm input
Measured A-weighted sound power level, Lwa (ref. 1pW) in decibels
105 dBA
97 dBA
Measured A-weighted sound pressure level, Lpa (ref. 20 µPa) at operator’s position, in decibels
Values determined according to noise test code given in using the basic standard ISO 3744
NOTE:Thesumofameasurednoiseemissionvalueanditsassociateduncertaintyrepresents
an upper boundary of the range of values which is likely to occur in measurements.
Declared vibration emission value in accordance with EN 12096
Measured vibration emission value: a (Throttle Handle)
Uncertainty: K (Throttle Handle)
1.0 m/sec2
0.15 m/sec2
2.1 m/sec2
0.20 m/sec2
Measured vibration emission value: a (Support Handle)
Uncertainty: K (Support Handle)
Values determined according to ISO 8662-1, ISO 8662-4, ISO 5349-1
ACCESSORIES
Description
Part Number
Grinding Wheel for Metal 9 in. Diameter × 5/8 in. -11 THD Arbor......................................................................02587
Grinding Wheel for Masonry 9 in. Diameter × 5/8 in. -11 THD Arbor.................................................................02588
Grinding Wheel 7 in. × 5/8 in. -11 THD Arbor ....................................................................................................03691
Depressed Center Wheel Adapter.....................................................................................................................05194
GR29 User Manual ◄ 15
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GR29 PARTS ILLUSTRATION
16 ► GR29 User Manual
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GR29 PARTS LIST
ITEM
NO.
ITEM
NO.
P/N
QTY DESCRIPTION
P/N
QTY DESCRIPTION
1
2
3
4
5
6
1
1
1
4
2
2
NUT
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
372055
13789
00812
01870
13778
08015
01211
08002
17061
00580
00786
12283
00936
07988
73041
23678
06533
22063
00026
22064
07989
03972
03973
03971
13779
1
1
8
8
1
2
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
DOWEL PIN
11206
28322
00230
00231
13796
CIRCUIT TYPE “C” DECAL (CE ONLY)
CE DECAL (CE ONLY)
CAPSCREW
MOTOR CAP ASSY.
WASHER
CAPSCREW
NAME TAG
LOCKWASHER
DEAD HANDLE BRACKET
WELDMENT
BACK-UP RING
O-RING
7
8
12285
16495
1
1
TRIGGER GUARD
REVERSING SPOOL
VALVE KEEPER
SETSCREW
HUB NUT (INCLUDED WITH
GR2930101 ONLY)
9
00599
28913
1
1
SETSCREW (INCLUDED WITH
GR2930101 ONLY)
CAPSCREW
TRIGGER
10
DRIVE FLANGE (INCLUDED WITH
GR2930101 ONLY)
ADAPTER
11
12
13
14
15
16
17
18
13812
13790
01220
12470
07724
08130
28811
28409
1
1
1
1
2
1
1
1
SHAFT SEAL
BEARING CARRIER
GREASE FITTING
CAPSCREW
SPRING
SPOOL ON/OFF
HEADED PUSH PIN
O-RING
NUT
SPOOL CAP
O-RING
HANDLE
INFORMATION PLAQUE
ROD WIPER
IDLER GEAR ASSY.
FEMALE COUPLER
MALE COUPLER
COUPLER SET
COMPOSITE SAFETY DECAL
(CE ONLY)
19
20
12535
1
1
CIRCUIT TYPE “E” DECAL (CE ONLY)
11937
08322
WHEEL GUARD
WHEEL GUARD GR29310 ONLY
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
12290
00285
12291
12786
00672
13813
00166
00149
13791
13828
07987
09396
08017
12286
09275
07991
08014
13783
08023
07978
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
2
1
1
1
CLAMP SCREW
ROLL PIN
64
JAM NUT (INCLUDED WITH GR29310
ONLY)
16969
12815
1
1
SEAL KIT
THUMB PLATE
STUD
WHEEL NUT SPANNER WRENCH
RETAINING RING
BALL BEARING
RETAINING RING
O-RING
SPINDLE SHAFT
WOODRUFF KEY
BACK-UP WASHER
BACK-UP RING
O-RING
MAIN HOUSING
RETAINING RING
IDLER SHAFT
BUSHING
DRIVE GEAR
O-RING
BUSHING
GR29 User Manual ◄ 17
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Stanley Hydraulic Tools
3810 SE Naef Road
Milwaukie, Oregon 97267-5698 USA
(503) 659-5660 / Fax (503) 652-1780
IMPORTANT
To fill out a Product Warranty Recording form, and for information on your warranty,
visit Stanleyhydraulic.com and select the Warranty tab.
(NOTE: The warranty recording form must be submitted to validate the warranty).
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