Page 1
GR29
UNDERWATER
HYDRAULIC GRINDER
USER MANUAL
Safety, Operation and Maintenance
© 2014 STANLEY Black & Decker, Inc.
New Britain, CT 06053
U.S.A.
66486 2/2018 Ver. 11
Page 2
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/Familiennname und Vornamen/Nom et pr énom/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
EN ISO
EN ISO
Machinery Directive
3744:2010
11148-7:2012
28927-1:2009
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 1-4-13
Signature/Unterschrift/Signature/Firma/Firma
Position/Position/Fonction/Cargo/Posizione Director of Product Development
DECLARATION OF CONFORMITY
2 ► GR29 User Manual
Page 3
TABLE OF CONTENTS
SAFETY SYMBOLS ..................................................................................................................................................4
SAFETY PRECAUTIONS .......................................................................................................................................... 5
TOOL STICKERS & TAGS ........................................................................................................................................ 7
HOSE TYPES ............................................................................................................................................................8
HOSE RECOMMENDATIONS ..................................................................................................................................9
HTMA / EHTMA REQUIREMENTS .........................................................................................................................10
OPERATION ............................................................................................................................................................ 11
TOOL PROTECTION & CARE ................................................................................................................................13
TROUBLESHOOTING ............................................................................................................................................14
SPECIFICATIONS ................................................................................................................................................... 15
GR29 PARTS ILLUSTRATION ................................................................................................................................ 16
GR29 PARTS LIST ..................................................................................................................................................17
GR29 CHANGES / UPDATES TO SPOOL & MAIN HOUSING .............................................................................18
UNDERWATER TOOLS DEPTH GUIDELINE .........................................................................................................19
To ll out a product warranty validation form, and for information on your warranty,
visit www.stanleyinfrastructure.com and select the Company tab > Warranty.
Note: The warranty validation record must be submitted to validate the warranty.
SERVICING: This manual contains safety, operation and routine maintenance instructions. STANLEY Infrastructure
recommends that 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 certied dealer, call STANLEY Infrastructure at (503) 659-5660 and ask for a Customer Service Representative.
GR29 User Manual ◄ 3
Page 4
SAFETY SYMBOLS
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 indicates an imminently hazardous situation
which, if not avoided, will result in death or serious injury.
This safety alert and signal word indicates a potentially hazardous situation
which, if not avoided, could result in death or serious injury.
This safety alert and signal word indicates 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
Page 5
SAFETY PRECAUTIONS
Tool operators and maintenance personnel must comply
with the safety precautions given in this manual and on
the stickers and tags attached to the tool and hose.
These 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. Place the added precautions in the
space provided.
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
bystanders. The operator must be familiar with all
prohibited work areas such as excessive slopes and
dangerous terrain conditions.
• Establish a training program for all operators to
ensure 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
before 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. High temperatures can cause operator
discomfort and may 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 be
performed by authorized and properly trained
personnel.
• Always replace parts with replacement parts
recommended by STANLEY.
• 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 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 become
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 it’s design capacity.
• Always keep critical tool markings, such as labels
and warning stickers, legible.
• Warning: Use of this tool on certain materials 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.
• 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
GR29 User Manual ◄ 5
Page 6
SAFETY PRECAUTIONS
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
operation.
• 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.
• Use 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
Page 7
TOOL STICKERS & TAGS
74818
Information Tag
28322
CE Decal
28409
Composite 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.
08688
Safety Decal
WARNING
Grinding Wheel and Jam
nut must be tightened with
a wrench before use.
10396
Warning Decal
73684
Name Tag
1. FAILURE TO USE HYDRAULIC HOSE LABELED AND CERTIFIED 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.
E
40 LPM @ 138 BAR
EHTMA CATEGORY
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 PROTECTION.
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.
SEE OTHER SIDE
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
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
Page 8
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:
Certi ed non-conductive — constructed of thermoplastic or synthetic rubber inner tube, synthetic ber braid
reinforcement, and weather resistant thermoplastic or synthetic rubber cover. Hose labeled certifi ed 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 certi ed 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 certifi ed 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. 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 PROPERLY
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
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, 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
SIDE 1
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
SEE OTHER SIDE
SIDE 2
DO NOT REMOVE THIS TAG
DO NOT REMOVE THIS TAG
8 ► GR29 User Manual
Page 9
Min. Working Pressure
USE
Press/Return)
(
HOSE RECOMMENDATIONS
Certi ed 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
recommendations are intended to keep return
line pressure (back pressure) to a minimum
acceptable level to ensure maximum tool
performance.
This chart is intended to be used for hydraulic
tool applications only based on STANLEY 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 maximum hydraulic system relief valve
setting.
All hydraulic hose must meet or exceed
speci cations as set forth by SAE J517.
GR29 User Manual ◄ 9
Page 10
HTMA / EHTMA REQUIREMENTS
HTMA / EHTMA REQUIREMENTS
TOOL TYPE
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 minimum operating temperature)
Temperature: Suf cient heat rejection capacity to limit
maximum uid temperature to:
(At maximum expected ambient temperature)
Minimum 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 minimum full- ow ltration 25 microns 25 microns 25 microns 25 microns
Sized for ow of at least:
(For cold temp startup and maximum dirt-holding capacity)
Hydraulic uid, petroleum based (premium grade, antiwear, non-conductive) Viscosity (at minimum and maximum
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.
TYPE I TYPE II TYPE RR TYPE III
4-6 GPM
(15-23 LPM)
1500 psi
(103 bar)
2100-2250 psi
(145-155 bar)
250 psi
(17 bar)
400 ssu*
(82 centistokes)
140° F
(60° C)
3 hp
(2.24 kW)
40° F
(22° C)
30 GPM
(114 LPM)
100-400 ssu
(20-82
centistokes)
7-9 GPM
(26-34 LPM)
1500 psi
(103 bar)
2100-2250 psi
(145-155 bar)
250 psi
(17 bar)
400 ssu*
(82 centistokes)
140° F
(60° C)
5 hp
(3.73 kW)
40° F
(22° C)
30 GPM
(114 LPM)
100-400 ssu
(20-82
centistokes)
9-10.5 GPM
(34-40 LPM)
1500 psi
(103 bar)
2200-2300 psi
(152-159 bar)
250 psi
(17 bar)
400 ssu*
(82 centistokes)
140° F
(60° C)
6 hp
(5.22 kW)
40° F
(22° C)
30 GPM
(114 LPM)
100-400 ssu
(20-82
centistokes)
11-13 GPM
(42-49 LPM)
2100-2250 psi
(145-155 bar)
(82 centistokes)
100-400 ssu
centistokes)
1500 psi
(103 bar)
250 psi
(17 bar)
400 ssu*
140° F
(60° C)
7 hp
(4.47 kW)
40° F
(22° C)
30 GPM
(114 LPM)
(20-82
*SSU = Saybolt Seconds Universal
EHTMA
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 speci cation page for tool speci c requirements.
10 ► GR29 User Manual
B
3.5-4.3 GPM
(13.5-16.5
LPM)
1870 psi
(129 bar)
2495 psi
(172 bar)
C
4.7-5.8 GPM
(18-22 LPM)
1500 psi
(103 bar)
2000 psi
(138 bar)
CLASSIFICATION
D
7.1-8.7 GPM
(27-33 LPM)
1500 psi
(103 bar)
2000 psi
(138 bar)
9.5-11.6 GPM
(36-44 LPM)
1500 psi
(103 bar)
2000 psi
(138 bar)
11.8-14.5 GPM
(45-55 LPM)
1500 psi
(103 bar)
2000 psi
(138 bar)
Page 11
OPERATION
PREPARATION PROCEDURES
CHECK THE POWER SOURCE
1. Using a calibrated ow meter 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 installed.
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
fasteners 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.
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
increase inside the hose may make them difcult to
connect. Whenever possible, connect the free ends
of the hoses together.
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
GR29 User Manual ◄ 11
Page 12
OPERATION
increase ow to a level that produces desired efciency,
but allows the operator to maintain full balance and
control.
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.
Refer to the Troubleshooting section of this manual to
isolate other possible conditions that can lower tool
efciency.
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.
UNDERWATER MODEL
PREVENTATIVE MAINTENANCE
After each use, the movable portions of the tool that
were exposed to water should be ushed with a water
displacing oil, such as WD-40™. Remove any remaining
water and debris as follows:
1. Turn the tool upside down and spray oil inside of the
tool and any moving parts.
2. Spray oil into the On/Off valve trigger slot area.
3. Dip or spray the entire tool.
4. Cycle the tool hydraulically several times before
storing away.
12 ► GR29 User Manual
Page 13
TOOL PROTECTION & CARE
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
connection.
• 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.
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
result.
• 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
Page 14
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 ow meter 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
producing 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
Fluid gets hot, power unit
working hard.
Tool doesn’t run. Power unit not functioning. Check that the power source is
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. Correct hose connections.
Open-center tool on a closed-center
circuit and vice versa.
Too much uid going through tool. Adjust ow for 12 GPM/34 LPM
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.
assembly instructions to prevent
cutting the O-rings.
for correct uid/circuit specications.
Use tool to match circuit.
maximum.
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.
producing 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
Page 15
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
Page 16
GR29 PARTS ILLUSTRATION
ITEM 59
INCLUDED WITH MODEL
GR29310 ONLY
36
52
30
ITEMS (7, 47 & 54)
INCLUDED WITH MODEL
GR2930101 ONLY
59
47
4
43
4
43
3
29
3
ITEM # 56 SEE
PAGE 18
BEFORE
ORDERING
12
41
32
44
7
54
17
35
26
13
57
8
45
37
33
5
51
55
58
19
10
15
27
56
17
14
39
23
40
25
11
22
11
23
9
ITEM 38, WHEEL
20
21
6
48
NUT SPANNER
31
P/N-12815
53
34
24
28
18
2
46
42
2
1
16
49 50
16 ► GR29 User Manual
ITEM # 55 SEE PAGE 18
BEFORE ORDERING
Page 17
GR29 PARTS LIST
ITEM # PART # QTY DESCRIPTION
1 00026 1 O-RING *
2 00166 2 RETAINING RING
3 00230 4 CAPSCREW
4 00231 2 LOCKWASHER
5 00285 1 ROLL PIN
6 00580 1 SETSCREW
7 00599 1 SETSCREW (GR2930101 ONLY)
8 00672 1 RETAINING RING EXTERNAL
9 00786 1 CAPSCREW
10 00936 2 ADAPTER
11 01211 2 O-RING *
12 01220 1 GREASE FITTING 1/8 CAPPED
13 01870 8 CAPSCREW
14 03972 1 COUPLER,3/8FEM. 3/8NPT
FL.FACE SET 03971
15 03973 1 COUPLER,3/8MALE 3/8NPT
FL.FACE SET 03971
16 06533 1 O-RING *
17 07724 2 NYLOCK NUT
18 07987 1 BACK-UP WASHER
19 07988 1 COMPRESSION COIL SPRING
20 07989 1 IDLER GEAR ASSY (INCLUDES
DU BUSHING)
21 07991 1 IDLER SHAFT
22 08002 1 REVERSING SPOOL
23 08015 2 BACK-UP RING *
24 08017 1 O-RING *
25 08023 1 O-RING *
26 08130 1 HANDLE
27 09275 1 RETAINING RING EXTERNAL
28 09396 1 BACK-UP RING *
29 11206 1 CIRCUIT TYPE "C" STICKER
30 11937 1 WHEEL GUARD
08322 1 WHEEL GUARD U/W MODEL
31 12283 1 TRIGGER U/W
32 12285 1 TRIGGER GUARD U/W
33 12290 1 CLAMP SCREW
34 12291 1 THUMB PLATE
35 12470 1 CAPSCREW
36 12535 1 CIRCUIT TYPE "E" STICKER
37 12786 1 STUD
38 12815 1 WHEEL NUT SPANNER
39 13783 1 DRIVE GEAR
40 13789 1 MOTOR CAP ASSY (INCLUDES
DU BUSHING & DOWEL PIN)
ITEM # PART # QTY DESCRIPTION
41 13790 1 BEARING CARRIER
42 13791 1 SPINDLE SHAFT
43 13796 2 DEAD HANDLE BRKT
WELDMENT
44 13812 1 ROTARY SHAFT SEAL *
45 13813 1 BALL BEARING
46 13828 1 WOODRUFF KEY #404
47 16495 1 HUB NUT (GR2930101 ONLY)
48 17061 1 VALVE KEEPER
49 22063 1 SPOOL CAP
50 22064 1 ROD WIPER *
51 23678 1 HEADED PUSH PIN
52 28322 1 STICKER "CE" 25MM
53 28409 1 COMPOSITE STICKER
54 28913 1 DRIVE FLANGE (GR2930101
ONLY)
55 73041 1 ON/OFF VALVE SPOOL (NOTE:
SEE PAGE 18 BEFORE ORDERING)
56 73311 1 MAIN HOUSING ASSY
(INCLUDES DU BUSHING)
(NOTE: SEE PAGE 18 BEFORE
ORDERING)
57 73684 1 NAME TAG - GR29 UW
58 74818 1 INFORMATION TAG -
GR2930101
59 13779 1 JAM NUT (INCLUDED WITH
GR29310 ONLY)
16969 1 SEAL KIT
* DENOTES PART IN SEAL KIT
GR29 User Manual ◄ 17
Page 18
GR29 CHANGES / UPDATES TO SPOOL & MAIN HOUSING
VALVE SPOOL (ITEM # 55)
The old valve spool (P/N-13781) was replaced with a new valve spool (P/N-73041) in February 2016. The new valve
spool is NOT backwards compatible and will NOT work in older main housings. If you have a tool with S/N-020516107
or earlier and are replacing the valve spool, purchase valve spool P/N-13781. If you have a tool with S/N-020516108
or higher and are replacing the valve spool, purchase valve spool P/N-73041.
Old Valve Spool P/N-13781 New Valve Spool P/N-73041
MAIN HOUSING ASSY
This main housing change took place in February 2016
Note: If you have an older GR29 with serial number 020516107 and earlier and you are replacing the main housing
assy shown below, you must purchase both a new valve spool (73041) and a new main housing (73311). The old
valve spool is not compatible with the new main housing design.
New main housing (P/N-73311)
used on all models starting with
serial number 020516108 and
higher.
73311
Old main housing (P/N-12286)
used on all models with serial
number 020516107 and lower.
This main housing is obsolete &
no longer available.
12286
18 ► GR29 User Manual
Note: If you are replacing the 12286 main housing,
you must purchase both the new valve spool and
new main housing (see NOTE above).
Page 19
UNDERWATER TOOLS DEPTH GUIDELINE
UNDERWATER MODELS ONLY
Do not use hydraulic tools underwater that are not
designated as an “underwater” model, or this will
result in damage to the tool.
For underwater hydraulic tools the
applications are broken down into four
quadrants depending on type of tool and
method of operation.
OPERATION OVERVIEW
PERCUSSIVE ROTATIONAL
Tools: Breakers,
Hammer Drills and
Chipping Hammers
Max Depth: 500’ -
DIVER
limitations due to
accumulator PSI
max (increase 40
PSI for every 100’)
Tools: Grinders,
Saws, Chain Saws
Max Depth: 1000’
- Reference hose
sizing guide below
The types of tools are percussive and
rotational, each with different characteristics
allowing for different depth operation. With
percussive tools, the nitrogen accumulator
PSI must counter the increase in ambient
pressure found at lower depths. Since there is
a maximum PSI for percussive tools they are
limited to certain depths. Rotational tools do
not have accumulators and thus are capable
of deeper depths.
The methods are broken into diver operated
or remote operated vehicle (ROV). ROV’s
can reach lower depths and with an onboard
hydraulic power source that is depth
compensated, can operate hydraulic tools at
depths of thousands of feet. ROV operation
is still limited to the tool, for example a
percussive tool has the same depth limitation
whether ROV or diver operated.
Tools: Breakers,
Hammer Drills and
Tools: Grinders,
Saws, Chain Saws
Chipping Hammers
Max Depth: 1000’
Max Depth: 500’ -
ROV
limitations due to
- Reference hose
sizing guide below
accumulator PSI
max (increase 40
PSI for every 100’)
RECOMMENDED HOSE DIAMETERS
DEPTH (FT) 8 GPM 12 GPM
100 5/8” 5/8”
300 3/4” 1”
600 1” 1”
1000 1” 1-1/4”
GR29 User Manual ◄ 19
Page 20
STANLEY Infrastructure
6430 SE Lake Road
Portland, Oregon 97222 USA
(503) 659-5660 / Fax (503) 652-1780
www.stanleyinfrastructure.com
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