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
DECLARATION OF CONFORMITY
DECLARATION OF CONFORMITY
ÜBEREINSTIMMUNGS-ERKLARUNG
DECLARATION DE CONFORMITE CEE
DECLARACION DE CONFORMIDAD
DICHIARAZIONE DI CONFORMITA
Hydraulic Tools
______________________________________________________________________
I, the undersigned:
Ich, der Unterzeichnende:
Je soussigné:
El abajo firmante:
lo sottoscritto:
Weisbeck, Andy
Surname and First names/Familiennnam e und Vornamen/Nom et prénom/Nombre y apellido/Cognome e nome
hereby declare that the equipment specified hereunder:
bestätige hiermit, daß erklaren Produkt genannten Werk oder Gerät:
déclare que l’équipement visé ci-dessous:
Por la presente declaro que el equipo se especifica a continuación:
Dichiaro che le apparecchiature specificate di seguito:
1. Category:
Grinder, Hydraulic
Kategorie:
Catégorie:
Categoria:
Categoria:
2. Make/Marke/Marque/Marca/Marca
Stanley
3. Type/Typ/Type/Tipo/Tipo:
GR2930101
4. Serial number of equipment:
Seriennummer des Geräts:
Numéro de série de l’équipement:
Numero de serie del equipo:
Matricola dell´attrezzatura:
All
Has been manufactured in conformity with
Wurde hergestellt in Übereinstimmung mit
Est fabriqué conformément
Ha sido fabricado de acuerdo con
E’ stata costruita in conformitá con
Directive/Standards
Richtlinie/Standards
Directives/Normes
Directriz/Los Normas
Direttiva/Norme
No.
Nr
Numéro
No
n.
Approved body
Prüfung durch
Organisme agréé
Aprobado
Collaudato
EN ISO
ISO
ISO
Machinery Directive
3744:2009
792-7:1994
8662-4:1995
2006/42/EC:2006
Self
Self
Self
Self
5. Special Provisions: None
Spezielle Bestimmungen:
Dispositions particulières:
Provisiones especiales:
Disposizioni speciali:
6. Representative in the Union: Patrick Vervier, Stanley Dubuis 17-19, rue Jules Berthonneau-BP 3406 41034 Blois Cedex, France.
Vertreter in der Union/Représentant dans l’union/Representante en la Union/Rappresentante presso l’Unione
Done at/Ort/Fait à/Dado en/Fatto a Stanley Hydraulic Tools, Milwaukie, Oregon USA
Date/Datum/le/Fecha/Data 1-4-11
Signature/Unterschrift/Signature/Firma/Firma
Position/Position/Fonction/Cargo/Posizione Engineering Manager
1/4/2011
2 ► GR29 User Manual
TABLE OF CONTENTS
WARNING
IMPORTANT
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
To ll 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 authorized and certied dealer. Please read the following 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 certied dealer, call Stanley Hydraulic Tools at the number listed on the back of this
manual and ask for a Customer Service Representative.
GR29 User Manual ◄ 3
SAFETY SYMBOLS
DANGER
WARNING
CAUTION
CAUTION
NOTICE
IMPORTANT
Safety symbols and signal words, as shown below, are used to emphasize all operator, maintenance and repair actions 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.
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 avoided, may result in property damage.
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 damage to the equipment.
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 maintenance personnel.
4 ► GR29 User Manual
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.
These safety precautions are given for your safety. Review them carefully before operating the tool and before
performing general maintenance or repairs.
Supervising personnel should develop additional precautions relating to the specic work area and local
safety regulations. If so, place the added precautions in
the space provided in this manual.
The GR29 Hydraulic Grinder will provide safe and dependable service if operated in accordance with the instructions 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.
• 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.
• Establish a training program for all operators to en-
sure safe operation.
• Do not operate this tool without rst reading this
manual.
• Do not operate the tool unless thoroughly trained or
under the supervision of an instructor.
• Always wear safety equipment such as goggles,
gloves, safety shoes, ear, breathing and head protection at all times when operating the tool.
• 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
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.
• Always replace parts with replacement parts recommended by Stanley Hydraulic Tools.
• 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 ats
behind the wheel and tighten securely.
• Do not overreach. Maintain proper footing and balance at all times.
• Always hold the tool with both hands when the unit
is running. Use a rm 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 entangled with the tool and cause serious injury.
• Supply hoses must have a minimum working pressure 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.
• Do not exceed the rated limits of the tool or use the
tool for applications beyond its design capacity.
• Always keep critical tool markings, such as labels
and warning stickers, legible.
• Warning: Use of this tool on certain materials during
demolition could generate dust potentially containing a variety of hazardous substances such as asbestos, 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 qualied
person.
GR29 User Manual ◄ 5
SAFETY PRECAUTIONS
• Warning: Hydraulic uid under pressure could cause
skin injection injury. If you are injured by hydraulic
uid, get medical attention immediately.
• Keep the wheel off all surfaces when starting the
grinder.
• Always carry the tool with the wheel stopped.
• Make sure the wheel has stopped before setting
down the tool.
• Keep the handles clean and free of uid at all times.
• Always inspect wheels for possible damage before
installation.
• Never transport or store the tool with the wheel
mounted on the grinder.
• Never cock, jam or wedge the wheel during opera-
tion.
• Never cause sparks in the vicinity of ammable materials.
• Do not operate the tool with the wheel guard removed.
• Do not start grinding until you have a clear work
area and secure footing.
• Do not allow other persons near the tool when starting or cutting.
• Never operate the tool when you are tired or fatigued.
• Do not use a wheel that is cracked or otherwise
damaged.
• Always use wheels that conform to the specications given in the Operation section of this manual.
• Do not reverse wheel rotation direction by changing
uid ow direction.
• Always support and secure items being worked on.
• Caution when handling the work piece after grinding, object can be hot and have sharp edges, use
your personal protection equipment.
• Keep your work area clean and clear of tripping hazards, oily surfaces and hoses laying about can be
hazardous.
• Make sure adequate lighting is always available.
• 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 hazard. Other underground utilities may present other
hazards.
• Do not operate this tool in a potentially explosive environment. Do not grind on vessels containing combustible substances.
• Any use of this tool outside those stated in this manual are forbidden.
6 ► GR29 User Manual
TOOL STICKERS & TAGS
28811
Information Plaque
28322
CE Decal
28409
Composite Decal
E
40 LPM @ 138 BAR
EHTMA CATEGORY
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.
08688
Safety Decal
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
03788
GPM Decal
4-12 GPM / 15-45 LPM
DO NOT EXCEED 2000 PSI / 140 BAR
PERSONAL INJURY.
WARNING
Grinding Wheel and Jam
nut must be tightened with
a wrench before use.
10396
Warning Decal
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.
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 REGULARLY TESTED FOR ELECTRIC CURRENT
LEAKAGE IN ACCORDANCE WITH YOUR SAFETY DEPARTMENT INSTRUCTIONS.
2. A HYDRAULIC LEAK OR BURST MAY CAUSE OIL INJECTION
INTO THE BODY OR CAUSE OTHER SEVERE PERSONAL
INJURY.
A. DO NOT EXCEED SPECIFIED FLOW AND PRESSURE
FOR THIS TOOL. EXCESS FLOW OR PRESSURE MAY
CAUSE A LEAK OR BURST.
B. DO NOT EXCEED RATED WORKING PRESSURE OF
HYDRAULIC HOSE USED WITH THIS TOOL. EXCESS
PRESSURE MAY CAUSE A LEAK OR BURST.
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.
12535
Circuit Type E Decal
11206
Circuit Type C Decal
DANGERDANGER
D. DO NOT LIFT OR CARRY TOOL BY THE HOSES. DO
NOT ABUSE HOSE. DO NOT USE KINKED, TORN OR
DAMAGED HOSE.
3. MAKE SURE HYDRAULIC HOSES ARE PROPERLY CONNECTED TO THE TOOL BEFORE PRESSURING SYSTEM.
SYSTEM PRESSURE HOSE MUST ALWAYS BE CONNECTED 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.
4. DO NOT CONNECT OPEN-CENTER TOOLS TO CLOSEDCENTER HYDRAULIC SYSTEMS. THIS MAY RESULT IN
LOSS OF OTHER HYDRAULIC FUNCTIONS POWERED BY
THE SAME SYSTEM AND/OR SEVERE PERSONAL INJURY.
5. BYSTANDERS MAY BE INJURED IN YOUR WORK AREA.
KEEP BYSTANDERS CLEAR OF YOUR WORK AREA.
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.
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.
IMPORTANT
READ OPERATION MANUAL AND
SAFETY INSTRUCTIONS FOR THIS
TOOL BEFORE USING IT.
USE ONLY PARTS AND REPAIR
PROCEDURES APPROVED BY
STANLEY AND DESCRIBED IN THE
OPERATION MANUAL.
TAG TO BE REMOVED ONLY BY
TOOL OPERATOR.
IMPORTANT
READ OPERATION MANUAL AND
SAFETY INSTRUCTIONS FOR THIS
USE ONLY PARTS AND REPAIR
PROCEDURES APPROVED BY
STANLEY AND DESCRIBED IN THE
TAG TO BE REMOVED ONLY BY
SEE OTHER SIDE
SAFETY TAG P/N 15875 (shown smaller then actual size)
TOOL BEFORE USING IT.
OPERATION MANUAL.
TOOL OPERATOR.
SEE OTHER SIDE
GR29 User Manual ◄ 7
HOSE TYPES
The rated working pressure of the hydraulic hose must be equal to or higher than the relief valve setting on the hydraulic system. There are three types of hydraulic hose that meet this requirement and are authorized for use with
Stanley Hydraulic Tools. They are:
Certied non-conductive — constructed of thermoplastic or synthetic rubber inner tube, synthetic ber braid
reinforcement, and weather resistant thermoplastic or synthetic rubber cover. Hose labeled certied 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 reinforcement, and weather resistant synthetic rubber cover. This hose is conductive and must never be used near
electrical conductors.
Fabric-braided (not certied or labeled non-conductive) — constructed of thermoplastic or synthetic rubber inner tube, synthetic ber braid reinforcement, and weather resistant thermoplastic or synthetic rubber cover. This
hose is not certied 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
DANGER
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.
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.
2. BEFORE USING HYDRAULIC HOSE LABELED AND CERTIFIED AS NON-CONDUCTIVE
ON OR NEAR ELECTRIC LINES. WIPE THE ENTIRE LENGTH OF THE HOSE AND FITTING 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.
DO NOT REMOVE THIS TAG
SEE OTHER SIDE
SIDE 1
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.
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.
5. CHECK ENTIRE HOSE FOR CUTS CRACKS LEAKS ABRASIONS, 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.
6. AFTER EACH USE STORE IN A CLEAN DRY AREA.
(Shown smaller than actual size)
DANGER
DANGER
SEE OTHER SIDE
SIDE 2
THE TAG SHOWN BELOW IS ATTACHED TO “CONDUCTIVE” HOSE.
DANGER
DANGER
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.
2. FOR PROPER AND SAFE OPERATION MAKE SURE THAT YOU HAVE BEEN PROPERLY
TRAINED IN CORRECT PROCEDURES REQUIRED FOR WORK ON OR AROUND ELECTRIC LINES.
3. DO NOT EXCEED HOSE WORKING PRESSURE OR ABUSE HOSE. IMPROPER USE OR HAN-
DLING 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.
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.
DO NOT REMOVE THIS TAG
SEE OTHER SIDE
5. CHECK ENTIRE HOSE FOR CUTS CRACKS LEAKS ABRASIONS, 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.
6. AFTER EACH USE STORE IN A CLEAN DRY AREA.
DANGER
SEE OTHER SIDE
DO NOT REMOVE THIS TAG
DO NOT REMOVE THIS TAG
8 ► GR29 User Manual
SIDE 1
SIDE 2
(Shown smaller than actual size)
Min. Working Pressure
USE
(Press/Return)
HOSE RECOMMENDATIONS
Certied Non-Conductive Hose - Fiber Braid - for Utility Bucket Trucks
Oil Flow Hose Lengths Inside Diameter
GPM LPM FEET METERS INCH MM PSI BAR
4-9 15-34 up to 10 up to 3 3/8 10 Both 2250 155
Conductive Hose - Wire Braid or Fiber Braid -DO NOT USE NEAR ELECTRICAL CONDUCTORS
4-6 15-23 up to 25 up to 7.5 3/8 10 Both 2500 175
4-6 15-23 26-100 7.5-30 1/2 13 Both 2500 175
5-10.5 19-40 up to 50 up to 15 1/2 13 Both 2500 175
5-10.5 19-40 51-100 15-30 5/8 16 Both 2500 175
5/8 16 Pressure 2500 175
3/4 19 Return 2500 175
5-10.5 19-40 100-300 30-90
10-13 38-49 up to 50 up to 15 5/8 16 Both 2500 175
5/8 16 Pressure 2500 175
3/4 19 Return 2500 175
10-13 38-49 51-100 15-30
3/4 19 Pressure 2500 175
1 25.4 Return 2500 175
10-13 38-49 100-200 30-60
5/8 16 Pressure 2500 175
13-16 49-60 up to 25 up to 8
3/4 19 Return 2500 175
3/4 19 Pressure 2500 175
1 25.4 Return 2500 175
13-16 49-60 26-100 8-30
PRESSURE
<<< FLOW
RETURN
FLOW >>>
Figure 1. Typical Hose Connections
Tool to Hydraulic Circuit Hose
Recommendations
The chart to the right shows recommended
minimum hose diameters for various hose
lengths based on gallons per minute (gpm)/
liters per minute (lpm). These recommenda-
tions are intended to keep return line pressure
(back pressure) to a minimum acceptable lev-
el to ensure maximum tool performance.
This chart is intended to be used for hydraulic
tool applications only based on Stanley Hy-
draulic Tools tool operating requirements and
should not be used for any other applications.
All hydraulic hose must have at least a rated
minimum working pressure equal to the maxi-
mum hydraulic system relief valve setting.
All hydraulic hose must meet or exceed
specications as set forth by SAE J517.
GR29 User Manual ◄ 9
HTMA REQUIREMENTS
HTMA / EHTMA REQUIREMENTS
HTMA
HYDRAULIC SYSTEM REQUIREMENTS
Flow Range
Nominal Operating Pressure
(at the power supply outlet)
System relief valve setting
(at the power supply outlet)
Maximum back pressure
(at tool end of the return hose)
Measured at a max. uid viscosity of:
(at min. operating temperature)
Temperature: Sufcient heat rejection
capacity to limit max. uid temperature to:
(at max. expected ambient temperature)
Min. cooling capacity at a temperature
difference of between ambient and uid
temps
NOTE:
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
Min. full-ow ltration
Sized for ow of at least:
(For cold temp. startup and max.
dirt-holding capacity)
4-6 gpm 7-9 gpm 9-10.5 gpm 11-13 gpm
(15-23 lpm) (26-34 lpm) (34-40 lpm) (42-49 lpm)
1500 psi 1500 psi 1500 psi 1500 psi
(103 bar) (103 bar) (103 bar) (103 bar)
2100-2250 psi 2100-2250 psi 2200-2300 psi 2100-2250 psi
(145-155 bar) (145-155 bar) (152-159 bar) (145-155 bar)
250 psi 250 psi 250 psi 250 psi
(17 bar) (17 bar) (17 bar) (17 bar)
400 ssu* 400 ssu* 400 ssu* 400 ssu*
(82 centistokes) (82 centistokes) (82 centistokes) (82 centistokes)
140° F 140° F 140° F 140° F
(60° C) (60° C) (60° C) (60° C)
3 hp 5 hp 6 hp 7 hp
(2.24 kW) (3.73 kW) (5.22 kW) (4.47 kW)
40° F 40° F 40° F 40° F
(22° C) (22° C) (22° C) (22° C)
25 microns 25 microns 25 microns 25 microns
30 gpm 30 gpm 30 gpm 30 gpm
(114 lpm) (114 lpm) (114 lpm) (114 lpm)
TYPE I TYPE II
TOOL TYPE
TYPE RR
TYPE III
Hydraulic uid Petroleum based
(premium grade, anti-wear, non-conductive)
Viscosity (at min. and max. operating temps)
NOTE:
When choosing hydraulic uid, the expected oil temperature extremes that will be experienced in service determine the
most suitable temperature viscosity characteristics. Hydraulic uids with a viscosity index over 140 will meet the requirements
over a wide range of operating temperatures.
*SSU = Saybolt Seconds Universal
EHTMA
100-400 ssu* 100-400 ssu* 100-400 ssu* 100-400 ssu*
(20-82 centistokes)
CLASSIFICATION
HYDRAULIC SYSTEM
REQUIREMENTS
Flow Range
Nominal Operating Pressure
(at the power supply outlet)
System relief valve setting
(at the power supply outlet)
NOTE: These are general hydraulic system requirements. See tool specication page for tool specic requirements
B
3.5-4.3 gpm 4.7-5.8 gpm 7.1-8.7 gpm 9.5-11.6 gpm 11.8-14.5 gpm
(13.5-16.5 lpm) (18-22 lpm) (27-33 lpm) (36-44 lpm) (45-55 lpm)
1870 psi 1500 psi 1500 psi 1500 psi 1500 psi
(129 bar) (103 bar) (103 bar) (103 bar) (103 bar)
2495 psi 2000 psi 2000 psi 2000 psi 2000 psi
(172 bar) (138 bar) (138 bar) (138 bar) (138 bar)
C
D
10 ► GR29 User Manual
PREOPERATION PROCEDURES
IMPORTANT
CHECK THE POWER SOURCE
1. Using a calibrated owmeter and pressure gauge,
check that the hydraulic power source develops a
ow of 4-12 gpm/15-45 lpm at 950-2000 psi/67-140
bar.
2. Make certain that the hydraulic power source is
equipped with a relief valve set to open at 21002250 psi/145-155 bar minimum.
3. Check that the hydraulic circuit matches the tool for
open-center (OC) or closed-center (CC) operation.
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.
2. There should be no signs of leaks.
3. The tool should be clean, with all ttings and fasten-
ers tight.
CHECK TRIGGER MECHANISM
1. Check that the trigger operates smoothly and is free
to travel between the “ON” and “OFF” positions.
2. Check that the trigger is set to disengage the grinder
when released.
CHECK HANDLE
Check that the cross handle is securely screwed into the
handle bracket. Remove any oil from the handle.
CHECK AND ADJUST WHEEL GUARD
1. Inspect the wheel guard for cracks and other structural damage.
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 after adjustment.
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 ats 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.
OPERATION
Never over-tighten the grinding wheel jam nut by
impacting either wrench with a mallet or hammer.
Sufcient torque is attained by hand-tightening the
nut with two open-end wrenches.
USE OF DEPRESSED-CENTER WHEEL
ADAPTER
The Depressed-Center Wheel Adapter (part number
05194) must be used with wheels having a cupped or
depressed center.
CONNECT HOSES
1. Wipe all hose couplers with a clean lint-free cloth
before making connections.
2. Connect the hoses from the hydraulic power source
to the tool ttings or quick disconnects. It is good
practice to connect return hoses rst and disconnect them last to minimize or avoid trapped pressure
within the tool.
3. Observe the arrow on the couplers to ensure that
the ow is in the proper direction. The female coupler on the tool is the inlet (pressure) coupler.
4. Move the hydraulic circuit control valve to the “ON”
position to operate the tool.
5. Squeeze the grinder trigger momentarily. If the
grinder does not operate, the hoses might be reversed. Verify correct connection of the hoses before continuing.
NOTE:
If uncoupled hoses are left in the sun, pressure in-
crease inside the hose may make them difcult to
connect. Whenever possible, connect the free ends
of the hoses together.
GR29 User Manual ◄ 11
OPERATION
TOOL OPERATION
For best results, use only Stanley approved accessories. They have been designed and selected to get the
most from the tool.
Review the Safety Precautions given at the front of this
manual before operating the tool.
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 grinding wheel.
Always start the grinder with the wheel away from the
work surface. Start hydraulic ow at one gpm and slowly
increase ow to a level that produces desired efciency,
but allows the operator to maintain full balance and con-
trol.
WARNING
Starting the hydraulic grinder on the work with full
hydraulic ow can push the operator off balance,
creating a condition that can cause severe
personal injury.
COLD WEATHER OPERATION
If the grinder is to be used during cold weather, preheat
the hydraulic uid at low engine speed. When using the
normally recommended uids, uid temperature should
be at or above 50 °F/10 °C (400 ssu/82 centistokes) before use.
Damage to the hydraulic system or grinder can result
from use with uid that is to viscous or too thick.
Refer to the Troubleshooting section of this manual to
isolate other possible conditions that can lower tool ef-
ciency.
12 ► GR29 User Manual
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.
• The hydraulic circuit control valve must be in the
“OFF” position when coupling or uncoupling hydraulic tools. Failure to do so may result in damage to
the quick couplers and cause overheating of the hydraulic system.
• Always store the tool in a clean dry space, safe from
damage or pilferage.
• 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 circuit ow. This can cause damage to internal seals.
• Always replace hoses, couplings and other parts
with replacement parts recommended by Stanley
Hydraulic Tools. Supply hoses must have a minimum working pressure rating of 2500 psi/172 bar.
• Do not exceed the rated ow (see Specications)
page in this manual for correct ow rate and model
number. Rapid failure of the internal seals may re-
sult.
• Always keep critical tool markings, such as warning
stickers and tags legible.
• Tool repair should be performed by experienced
personnel only.
• Make certain that the recommended relief valves
are installed in the pressure side of the system.
• Do not use the tool for applications for which it was
not intended.
GR29 User Manual ◄ 13
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 ow and pressure to the tool as listed in the table. Use a owmeter known to be accurate. Check the ow
with the hydraulic uid temperature at least 80 °F/27 °C.
PROBLEM CAUSE SOLUTION
Low performance. Incorrect hydraulic ow. 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 assembly face.
Fluid leaks at reversing spool. Damaged O-rings. Replace as required. Refer to assem-
Fluid gets hot, power unit working hard.
Tool doesn’t run. Power unit not functioning. Check that the power source is pro-
Tool runs backwards. Pressure and return hoses reversed. Correct for proper ow direction.
Grinding wheel comes to abrupt
stop after trigger is released.
Fasteners loose. Tighten to recommended torque
value.
Face O-ring worn or missing. Replace as required.
Motor cap assembly/main housing
damaged.
Wrong hydraulic uid. Circuit too hot. See Hydraulic System Requirements
Hydraulic pressure and return reversed.
Open-center tool on a closed-center
circuit and vice versa.
Too much uid going through tool. Adjust ow for 12 gpm/34 lpm maxi-
Circuit is generating high heat with ow
controls, open relief valve, etc.
Circuit has contaminants that have
caused pump and valve wear and high
heat generation.
Coupler or hoses blocked. Remove obstruction.
Mechanical failure. Disassemble tool and inspect for
Porting spool incorrectly assembled. Refer to Service Manual.
Check valve in trigger spool not functioning correctly.
Mechanical failure. Disassemble tool and inspect for
Replace as required.
bly instructions to prevent cutting the
O-rings.
for correct uid/circuit specications.
Correct hose connections.
Use tool to match circuit.
mum.
Use pump size and rpm for producing needed ow only. Eliminate circuit
heating cause.
Replace worn pump and valves. Install a large clean lter and keep circuit uid clean.
ducing 4–12 gpm/15–45 lpm at
1000–2000 psi/70–140 bar.
damage.
Grinding wheel should rotate counterclockwise when viewed from the shaft
end.
Replace trigger spool assembly.
Check valve not serviceable.
damage.
14 ► GR29 User Manual
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
Measured A-weighted sound pressure level, Lpa (ref. 20 µPa) at operator’s position, in decibels 97 dBA
Values determined according to noise test code given in using the basic standard ISO 3744
NOTE: The sum of a measured noise emission value and its associated uncertainty represents
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) 1.0 m/sec
Uncertainty: K (Throttle Handle) 0.15 m/sec
Measured vibration emission value: a (Support Handle) 2.1 m/sec
Uncertainty: K (Support Handle) 0.20 m/sec
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
2
2
2
2
GR29 User Manual ◄ 15
GR29 PARTS ILLUSTRATION
16 ► GR29 User Manual
GR29 PARTS LIST
ITEM
NO. P/N QTY DESCRIPTION
1 1 NUT
2 11206 1 CIRCUIT TYPE “C” DECAL (CE ONLY)
3 28322 1 CE DECAL (CE ONLY)
4 00230 4 CAPSCREW
5 00231 2 LOCKWASHER
6 13796 2 DEAD HANDLE BRACKET
7 12285 1 TRIGGER GUARD
8 16495 1 HUB NUT (INCLUDED WITH
9 00599 1 SETSCREW (INCLUDED WITH
10 28913 1 DRIVE FLANGE (INCLUDED WITH
11 13812 1 SHAFT SEAL
12 13790 1 BEARING CARRIER
13 01220 1 GREASE FITTING
14 12470 1 CAPSCREW
15 07724 2 NUT
16 08130 1 HANDLE
17 28811 1 INFORMATION PLAQUE
18 28409 1 COMPOSITE SAFETY DECAL
19 12535 1 CIRCUIT TYPE “E” DECAL (CE ONLY)
20 11937
08322
21 12290 1 CLAMP SCREW
22 00285 1 ROLL PIN
23 12291 1 THUMB PLATE
24 12786 1 STUD
25 00672 1 RETAINING RING
26 13813 1 BALL BEARING
27 00166 2 RETAINING RING
28 00149 1 O-RING
29 13791 1 SPINDLE SHAFT
30 13828 1 WOODRUFF KEY
31 07987 1 BACK-UP WASHER
32 09396 1 BACK-UP RING
33 08017 1 O-RING
34 12286 1 MAIN HOUSING
35 09275 1 RETAINING RING
36 07991 1 IDLER SHAFT
37 08014 2 BUSHING
38 13783 1 DRIVE GEAR
39 08023 1 O-RING
40 07978 1 BUSHING
WELDMENT
GR2930101 ONLY)
GR2930101 ONLY)
GR2930101 ONLY)
(CE ONLY)
1 WHEEL GUARD
WHEEL GUARD GR29310 ONLY
ITEM
NO. P/N QTY DESCRIPTION
41 372055 1 DOWEL PIN
42 13789 1 MOTOR CAP ASSY.
43 00812 8 WASHER
44 01870 8 CAPSCREW
45 13778 1 NAME TAG
46 08015 2 BACK-UP RING
47 01211 2 O-RING
48 08002 1 REVERSING SPOOL
49 17061 1 VALVE KEEPER
50 00580 1 SETSCREW
51 00786 1 CAPSCREW
52 12283 1 TRIGGER
53 00936 2 ADAPTER
54 07988 1 SPRING
55 73041 1 SPOOL ON/OFF
56 23678 1 HEADED PUSH PIN
57 06533 1 O-RING
58 22063 1 SPOOL CAP
59 00026 1 O-RING
60 22064 1 ROD WIPER
61 07989 1 IDLER GEAR ASSY.
62 03972 1 FEMALE COUPLER
63 03973 1 MALE COUPLER
03971 1 COUPLER SET
64 13779 1 JAM NUT (INCLUDED WITH GR29310
ONLY)
16969 1 SEAL KIT
12815 1 WHEEL NUT SPANNER WRENCH
GR29 User Manual ◄ 17
IMPORTANT
Stanley Hydraulic Tools
3810 SE Naef Road
Milwaukie, Oregon 97267-5698 USA
(503) 659-5660 / Fax (503) 652-1780
www.stanleyhydraulic.com
To ll 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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