Stanley GR30 User manual

© 2014 STANLEY Black & Decker, Inc.
New Britain, CT 06053
U.S.A.
49237 9/2018 Ver. 10
USER MANUAL
Safety, Operation and Maintenance
GR30
HYDRAULIC
GRINDER

2 ► GR30 User Manual
DECLARATION OF CONFORMITY
DECLARATION OF CONFORMITY
ÜBEREINSTIMMUNGS-ERKLARUNG
DECLARATION DE CONFORMITE CEE
DECLARACION DE CONFORMIDAD
DICHIARAZIONE DI CONFORMITA
______________________________________________________________________
I, the undersigned:
Ich, der Unterzeichnende:
Je soussigné:
El abajo firmante:
lo sottoscritto:
Nuerenberg, David
Surname and First names/Familiennname 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: GR3070101
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
EN ISO
EN ISO
EN ISO
EN ISO
Machinery Directive
28927-8
3744 (15744)
11148-7, Cl. 5.6
11148-7, Cl. 5.7
13732-1
11148-7, Cl. 5.4
11148-7, Cl. 5.5
2006/42/EC
Self
Self
Self
Self
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 Infrastructure, Milwaukie, Oregon USA Date/Datum/le/Fecha/Data 4-25-2018
Signature/Unterschrift/Signature/Firma/Firma
Position/Position/Fonction/Cargo/Posizione North America Quality Manager

GR30 User Manual ◄ 3
TABLE OF CONTENTS
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 certied dealer. Please read the following warning.
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.
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 certied dealer, call STANLEY Infrastructure at [phone] and ask for a Customer Service Representative.
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..............................................................................................................................19
TROUBLESHOOTING ..........................................................................................................................................20
SPECIFICATIONS .................................................................................................................................................22
ACCESSORIES .....................................................................................................................................................22
GR30 PARTS ILLUSTRATION..............................................................................................................................23
GR30 PARTS LIST.................................................................................................................................................24

4 ► GR30 User Manual
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.
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.
SAFETY SYMBOLS
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 specic work area and local safety
regulations. Place the added precautions in the space provided.
The GR30 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.

GR30 User Manual ◄ 5
SAFETY PRECAUTIONS
• 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.
• Operators and maintenance personnel shall be able
to physically handle the bulk, weight and power of
the tool.
• Slips, trips and falls are major causes of workplace
injury. Be aware of slippery surfaces caused by the
use of the tool and also of trip hazards caused by
the hydraulic hose.
• 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, clean, change accessories or
perform maintenance on 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.
• During use, the operator should adopt a comfortable
posture while maintaining secure footing and
avoiding awkward or o󰀨-balance postures. Change
postures during extended tasks to help avoid
discomfort and fatigue.
• When using a grinding tool to perform work related
activities, the operator can experience discomfort in
the hands, arms, shoulders, neck or other parts of
the body.
• If you experience numbness, tingling, pain or
whitening of the skin in your ngers or hands, stop
using the tool. Tell your employer and consult a
physician.
• Check for vibration level before each service. If you
feel a higher than normal vibration, contact your
STANLEY dealer for repair.
• 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.
• Use only lubricants 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: Some dust created by power sanding,
sawing, grinding, drilling, and other construction
activities contains chemicals known to the State
of California to cause cancer, birth defects or
other reproductive harm. Some examples of these
chemicals are:
• Lead from lead-based paints,
• crystalline silica from bricks and cement
and other masonry products, and
• arsenic and chromium from chemically-
treated lumber.
Your risk from these exposures varies, depending
on how often you do this type of work. To reduce
your exposure to these chemicals: work in a well
ventilated area, and work with approved safety
equipment, such as those dust masks that are

6 ► GR30 User Manual
SAFETY PRECAUTIONS
specially designed to lter out microscopic particles.
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 qualied person.
• Warning: Hydraulic uid under pressure could
cause skin injection injury. If you are injured by
hydraulic uid, get medical attention immediately.
• Use only clean hydraulic oil and lling equipment.
Contaminated hydraulic oil can cause damage to
the tool.
• Keep the wheel o󰀨 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
operation.
• Never cause sparks in the vicinity of ammable
materials.
• Grinding sparks can ignite clothing and cause severe
burns. Ensure sparks do not land on clothing. Wear
re-retardant clothing and have a bucket of water
nearby.
• Inspect the guard before each use to ensure that
it is in place, is in good condition and is correctly
mounted.
• Inspect tool spindle, threads and grinding wheel
clamping devices before each use. Ensure they
are in place, are in good condition and are correctly
mounted.
• Before use, ensure that the abrasive wheel is properly
clamped. Follow all manufacturer instructions as to
the safe clamping of the abrasive product.
• Ensure that the maximum operating speed of the
abrasive product, in RPM, is equal or greater than
the rated speed of the tool spindle.
• 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 specications
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. This tool is not insulated from coming
into contact with electric power.
• 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.
• Do not exceed the maximum relief valve setting
stated on the tool.
• Do not exceed the rated ow and pressure as stated
on the tool. Rapid failure of the internal seals may
result. Regularly check the ow and pressure of the
hydraulic power source. Proper ow and pressure
maintain proper tool speed.

GR30 User Manual ◄ 7
28322
CE Decal
28409
Composite Decal
SAFETY TAG P/N 15875 (shown smaller then actual size)
DANGERDANGER
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
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 DEPART-
MENT 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.
IMPORTANT
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 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.
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 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.
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
74819
Information Tag
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.
NOTE:
THE INFORMATION LISTED
ON THE STICKERS SHOWN,
MUST BE LEGIBLE AT ALL
TIMES.
REPLACE DECALS IF
THEY BECOME WORN OR
DAMAGED. REPLACEMENTS
ARE AVAILABLE FROM
YOUR LOCAL STANLEY
DISTRIBUTOR.
D
30 LPM @ 138 BAR
EHTMA CATEGORY
11207
Circuit Type D Decal
11354
OC/CC Sticker
OC/CC
FOR USE ON OPEN CENTER AND CLOSED
CENTER HYDRAULIC SYSTEMS, “SET FOR
PROPER SYSTEM BEFORE USE”
73680
Railroad Help Desk
58862
Warning Pressure
58863
Warning Grinding Wheel
74697
GR30 Name Tag Sticker
TOOL STICKERS & TAGS

8 ► GR30 User Manual
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
THE TAG SHOWN BELOW IS ATTACHED TO “CONDUCTIVE” HOSE.
(Shown smaller than actual size)
SIDE 1
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 HOSEAND 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.
SEE OTHER SIDE
SIDE 2
DO NOT REMOVE THIS TAG
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 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
DANGER
DO NOT REMOVE THIS TAG
DANGER
(Shown smaller than actual size)
SIDE 2
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
DO NOT REMOVE THIS TAG
DANGER
SIDE 1
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 ELEC-
TRIC 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
DANGER
SEE OTHER SIDE SEE OTHER SIDE
HOSE TYPES

GR30 User Manual ◄ 9
Oil Flow Hose Lengths Inside Diameter USE
(Press/Return)
Min. Working Pressure
GPM LPM FEET METERS INCH MM PSI BAR
Certi ed Non-Conductive Hose - Fiber Braid - for Utility Bucket Trucks
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 5-10.5 19-40 100-300 30-90 5/8 16 Pressure 2500 175
3/4 19 Return 2500 175
10-13 38-49 up to 50 up to 15 5/8 16 Both 2500 175 10-13 38-49 51-100 15-30 5/8 16 Pressure 2500 175
3/4 19 Return 2500 175
10-13 38-49 100-200 30-60 3/4 19 Pressure 2500 175
1 25.4 Return 2500 175
13-16 49-60 up to 25 up to 8
5/8 16 Pressure 2500 175 3/4 19 Return 2500 175
13-16 49-60 26-100 8-30
3/4 19 Pressure 2500 175
1 25.4 Return 2500 175
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.
PRESSURE
RETURN
<<< FLOW
FLOW >>>
HOSE RECOMMENDATIONS

10 ► GR30 User Manual
HTMA / EHTMA REQUIREMENTS
TOOL TYPE
HTMA
HYDRAULIC SYSTEM REQUIREMENTS TYPE I TYPE II TYPE RR TYPE III
Flow range 4-6 GPM
(15-23 LPM)
7-9 GPM
(26-34 LPM)
9-10.5 GPM
(34-40 LPM)
11-13 GPM
(42-49 LPM)
Nominal operating pressure
(At the power supply outlet)
1500 psi
(103 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
System relief valve setting
(At the power supply outlet)
2100-2250 psi
(145-155 bar)
2100-2250 psi
(145-155 bar)
2200-2300 psi
(152-159 bar)
2100-2250 psi
(145-155 bar)
Maximum back pressure
(At tool end of the return hose)
250 psi
(17 bar)
250 psi
(17 bar)
250 psi
(17 bar)
250 psi
(17 bar)
Measured at a max  uid viscosity of:
(At minimum operating temperature)
400 ssu*
(82 centistokes)
400 ssu*
(82 centistokes)
400 ssu*
(82 centistokes)
400 ssu*
(82 centistokes)
Temperature: Su󰀩 cient heat rejection capacity to limit
maximum  uid temperature to:
(At maximum expected ambient temperature)
140° F
(60° C)
140° F
(60° C)
140° F
(60° C)
140° F
(60° C)
Minimum cooling capacity at a temperature di󰀨 erence of
between ambient and  uid temps
3 hp
(2.24 kW)
40° F
(22° C)
5 hp
(3.73 kW)
40° F
(22° C)
6 hp
(5.22 kW)
40° F
(22° C)
7 hp
(4.47 kW)
40° F
(22° C)
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)
30 GPM
(114 LPM)
30 GPM
(114 LPM)
30 GPM
(114 LPM)
30 GPM
(114 LPM)
Hydraulic  uid, petroleum based (premium grade, anti-
wear, non-conductive) Viscosity (at minimum and maximum
operating temps)
100-400 ssu
(20-82
centistokes)
100-400 ssu
(20-82
centistokes)
100-400 ssu
(20-82
centistokes)
100-400 ssu
(20-82
centistokes)
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
CLASSIFICATION
EHTMA
HYDRAULIC SYSTEM
REQUIREMENTS BCD
Flow range
3.5-4.3 GPM
(13.5-16.5
LPM)
4.7-5.8 GPM
(18-22 LPM)
7.1-8.7 GPM
(27-33 LPM)
9.5-11.6 GPM
(36-44 LPM)
11.8-14.5 GPM
(45-55 LPM)
Nominal operating pressure
(At the power supply outlet)
1870 psi
(129 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
1500 psi
(103 bar)
1500 psi
(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 speci cation page for tool speci c requirements.
HTMA / EHTMA REQUIREMENTS

GR30 User Manual ◄ 11
PREPARATION PROCEDURES
The GR30 Hydraulic Grinder requires minimum setup for operation. When the installation and operation instructions
are carefully followed, the tool will provide years of e󰀩cient and reliable service.
GRINDING WHEEL REPLACEMENT - FIG. 2
1. Always disconnect the hydraulic power source from the grinder before replacing the grinding wheel.
2.
Inspecting the tool or installing parts with the
hydraulic hoses connected can result in severe
personal injury or equipment damage.
To prevent accidental start-up, disconnect the
hydraulic power before beginning any inspection or
installation task.
If the hydraulic hoses are connected to the tool:
a. Turn the hydraulic system control valve OFF.
b. Disconnect rst the hydraulic input (supply) hose,
then the output (return) hose.
3. Remove the old grinding wheel, if any:
Non-CE Models
a. Place a 5/8 in. open-end wrench on the ats of the
output shaft.
b. Remove the jam nut from the output shaft.
c. Unscrew the old grinding wheel.
CE Models
a. Turn the hydraulic system control valve OFF.
b. Disconnect rst the hydraulic input (supply) hose,
then the output (return) hose.
c. Using the wheel nut spanner, remove the hub nut.
d. Unscrew the old grinding wheel.
Screw the hub nut and secure the wheel to the shaft using
the wheel nut spanner.
4. Clean the surfaces of the tool to remove any dirt or
grease.
5. Check the grinding wheel:
a. Make sure the correct wheel is selected for the
job. The wheel must conform to the specications
listed in this manual.
Note: Do not use an abrasive wheel for side grinding,
unless the wheel is designed for side grinding. Never
allow the grinder to exceed the maximum speed of an
abrasive product.
OPERATION
Figure 2 - Install Wheel
Non-CE Models
CE Models

12 ► GR30 User Manual
b. Make sure the wheel is free of dirt and other foreign particles, especially the surfaces that contact the tool
and jam nut.
c. Check the wheel for damage or wear.
6. If the wheel does not include an integral thread, use a depressed-center wheel adapter in the hole on the wheel.
7.
Never over-tighten the grinding wheel jam nut by
impacting either wrench with a mallet or hammer.
Su󰀩cient torque is attained by hand tightening the
nut with two open-end wrenches.
Install the grinding wheel:
a. Thread the grinding wheel or adapter on the shaft and tighten using appropriate wrenches.
b. Screw the jam nut on the output shaft.
c. Tighten the nut securely using two open-end wrenches. Place one wrench on the ats of the output shaft
and the other on the jam nut.
d. Ensure that the dimensions of the abrasive product are compatible with the grinder and that the abrasive
product ts the spindle. Also ensure that the thread type and size of the abrasive exactly match the thread
type and size of the spindle.
Never use a chipped, damaged or worn grinding
wheel.
Note: If the grinding wheel is provided with reducing adaptors or busings, ensure that the adaptor or
bushing does not contact the face of the ange and that the clamping force provides su󰀩cient rotational
driving action to prevent the abrasive product from slipping. In cases where anges are supplied for several
types or sizes of abrasive, always t the correct ange for the abrasive being used.
HYDRAULIC HOSE CONNECTION
Proper installation of the hydraulic hoses is extremely important for safe, reliable operation of the tool. Make sure
the hoses are securely attached to the tool before turning on the hydraulic power.
Note: If possible, connect the free ends of the hoses together when not in use. The pressure increase in
uncoupled hoses left in the sun may make them di󰀩cult to connect.
OPERATION

GR30 User Manual ◄ 13
Connecting hydraulic hoses to the tool while the
hydraulic power source in ON can cause personal
injury or damage to the equipment.
Make sure the hydraulic power source is OFF before
connecting or disconnecting the hydraulic hoses.
1. Make sure the hydraulic system control valve is in the OFF position when coupling or uncoupling the hoses.
Failure to do so may result in damage to the quick couplers and cause overheating of the hydraulic system.
2. Before installing the hoses, wipe the ttings with a clean, dry lint-free cloth to remove any dirt or moisture. Dirty
connections can contaminate the hydraulic uid, causing rapid wear and early failure of internal parts.
3.
Reversing the direction of hydraulic ow to the tool
can cause severe personal injury or damage to the
equipment.
Make sure the input and output hoses are connected
to the correct port on the tool.
If hose couplers are used, check the ow indicators (arrows) stamped on the couplers to ensure oil ows in the
proper direction. The female coupler on the tool is the inlet coupler.
4. It is a good practice to connect the output (return) hose rst and disconnect it last to minimize or avoid trapped
pressure within the tool.
a. Connect the output hose to the OUT port on the tool.
b. Connect the input hose to the IN port.
c. Be sure all hose connections are tight.
TEST
Test the grinder to verify the hoses are connected correctly.
1. Move the hydraulic system control valve to ON.
2. Ensure that the grinding wheel is correctly mounted and tightened before use. Squeeze the grinder trigger.
Note: Run the grinder at no load for at least 1 minute in a safe position. Stop the tool immediately if
considerable vibration or other defects are detected. Determine the cause of these defects before using
the tool.
OPERATION
PREPARATION INSPECTION
Careful inspection of the tool and hydraulic system before startup is important for safe, reliable operation of the tool.
DAILY MAINTENANCE INSPECTION
OPERATION

14 ► GR30 User Manual
The following items should be checked daily at the start and the end of each work shift.
Maintaining or repairing the tool with the hydraulic
system before startup is important for safe, reliable
operation of the tool.
To prevent accidental startup while maintaining or
servicing the tool, disconnect the hydraulic power
before beginning task.
Make sure the hydraulic system control valve is in the OFF position and the hoses are disconnected before inspecting
the grinder.
1. Inspect the grinding wheel and guard:
a. Make sure the correct grinding wheel is installed for the job. If not, follow the instructions for the Grinding
Wheel Replacement. Refer to the Specications Section for the grinding wheel requirements.
b. Inspect the wheel for chips, cracks, or other damage. For maximum tool performance, replace the wheel if
it is worn or defective.
c. Inspect the wheel guard for cracks or other structural damage and replace if necessary.
d. If necessary, adjust the position of the wheel guard by loosening the clamp.
e. Check the capscrews on the wheel guard for tightness.
2. Inspect the cross handle:
a. Make sure the cross handle in screwed tightly into the main body housing.
b. Clean any oil from the cross handle to ensure a rm grip.
3. Check the trigger mechanism:
a. Make sure the trigger operates smoothly and is free to travel between the ON and OFF positions.
b. Make sure the grinder stops when the trigger is released.
4. Check to ensure that the anges, spindle and spindle threads are not worn, cracked or damaged. Replace any
worn, cracked or damaged parts before using the tool.
5. The tool should be clean, with all ttings and fasteners tight.
6. Check the tool for oil leaks. If leaks are observed, do not use the tool; have the equipment serviced before use.
Check the speed of the motor output shaft after
every 100 hours of operation using a contact
tachometer.
HYDRAULIC POWER SOURCE CHECK
1. Connect the hydraulic hoses in accordance with the instructions for Hydraulic Hose Connection. Wipe all hose
couplers with a clean, lint-free cloth before making connections. Dirty couplers can contaminate the hydraulic
circuit and prevent a good seal at the connection.
2. Using a calibrated ow meter and pressure gauge, check the hydraulic power source at the tool’s input port.
Make sure the system provides the following ow requirements:
OPERATION

GR30 User Manual ◄ 15
a. Operating ow of 7–9 GPM / 26–34 LPM
b. At 2000 psi/140 bar pressure
The hydraulic uid temperature should be at least 80 °F/27 °C for this test. Refer to the Hydraulic System
Requirements section for more information.
3. Make sure the hydraulic power source has a relief valve set at a minimum of 2100 psi/145 bar.
4. Check the tool and hydraulic system for proper operation and performance. If the equipment does not appear
to operate properly, have it serviced before use.
COLD WEATHER OPERATION
Use a hydraulic oil with the recommended
specications. Using oil that is too thick can damage
the hydraulic system or tool.
Before using the tool in cold weather, preheat the hydraulic uid by operating the power unit at a low speed. The oil
should be at or above 50 °F/10 °C with a viscosity of 400 SSU/82 cs before operating the tool.
OPEN CENTER/ CLOSED CENTER SETUP (OC/CC) - FIG. 3
This tool can be congured to run on both open center
and closed center systems.
1. Determine your system type.
2. Remove hex plug (78) from spring cap using a 3/16
in. hex.
Using a 3/16 in. Hex, reach through the hole in the
spring cap and turn the selector screw fully clockwise
for closed center systems or counter-clockwise for
open center systems.
3. Reinstall hex plug. Failure to install plug may
introduce contaminants to the spool bore resulting
in replacement of the valve spool and main housing.
To prevent damage to the retaining ring, do not
attempt to force the selector screw counter-clockwise
beyond the point of initial resistance.
Figure 3 - Open Center / Closed Center
OPERATION

16 ► GR30 User Manual
TOOL OPERATION
Improper operation of this tool can cause severe
personal injury, death or equipment damage.
Read the safety guidelines and instructions in this
manual before operating the tool.
Observe all safety precautions when operating the tool. Read the Safety and the HTMA Requirements sections
before operating the tool for the rst time. Failure to do so can result in severe eye injury or injury to other parts of
the body.
STARTUP
At the beginning of each shift, or after a new wheel is installed, run the grinder at operating speed for at least one
minute before starting work.
• Move the hydraulic system control valve to the ON position.
• Slowly squeeze the trigger.
• Run the grinder at least one minute.
• Release the trigger.
If excessive vibration or any other defect is detected, stop the tool immediately and determine the cause. Do not use
the tool until the problem is corrected.
GENERAL PROCEDURE - FIG. 4
1. Grip the tool with both hands at all times during start-up and operation. Your dominant hand holds the tool
handle and your non-dominant hand holds the cross handle.
2. Always start the grinder with the wheel away from the work surface.
3. Make sure you have full balance before starting the grinder’s plane of rotation.
4. Squeeze the trigger to start the grinder.
Note: Hold the tool correctly and be ready to counteract normal or sudden movements. Have both hands
available.
5. Release Trigger to stop the tool.
Note: If you encounter a breakdown or the tool stops for any reason, release the trigger and power down
the hydraulic power source.
6. If the grinding wheel becomes jammed for any reason, release the trigger, disconnect the hydraulic power
source and ease the wheel free. Before restarting work, ensure the wheel is not damaged and is properly
secured to the spindle.
7. After grinding, or when taking a break, place the grinder in a stable position, where it cannot be accidentally
started or where it can become a hazard.
OPERATION

GR30 User Manual ◄ 17
Figure 4 - Tool Use
ASSIST
HANDLE
MAIN TOOL
HANDLE
SHUTDOWN
1. Move the hydraulic system control valve to the OFF position.
2. Disconnect the hydraulic hoses from the tool: rst the input (supply) hose, then the output (return) hose.
3. Place dust plugs on the couplers, as applicable.
4. Wipe the tool thoroughly with a clean dry cloth.
5. Clean any foreign matter from the grinding wheel surfaces.
CARE AND STORAGE
Clean and inspect the wheel and tool before storing.
GRINDING WHEELS
All grinding wheels are breakable. Exercise care in handling and storage to prevent damage.
1. Clean used wheels to remove any dirt, debris or grease.
2. Inspect the wheel for chips, cracks or other damage. For maximum tool performance, replace the wheel if it is
worn or defective.
TOOL
1. Clean the tool to remove any dirt, debris, or grease. Dry with compressed air or clean dry cloths.
2. Replace any damaged or missing safety labels and tags before storing the tool. Otherwise, the tool might be
improperly used by someone who is not familiar with the safety requirements.
3. Store the tool in a clean, dry, safe place.
DISPOSAL
HYDRAULIC OIL
Hydraulic oil can contaminate the air, ground and water if not properly recycled. Recycle hydraulic oil in accordance
with all State, Federal and local laws, at your local oil recycling facility.
OPERATION

18 ► GR30 User Manual
TOOL BODY
Drain the tool body of all hydraulic oil. Collect all the drained oil and recycle.
Disassemble the tool and discard all seals and O-rings.
Recycle the tool body in accordance with all State, Federal and local laws, at your municipal metal recycling facility.
OPERATION

GR30 User Manual ◄ 19
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. Rapid failure of the
internal seals may result. See “SPECIFICATIONS”
on page 22 for correct ow rate and model
number.
• 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.
TOOL PROTECTION & CARE

20 ► GR30 User Manual
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 tool, always check that 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 oil temperature at least 80° F/27° C.
Inspecting the tool or installing parts with the
hydraulic hoses connected can result in severe
personal injury or equipment damage.
To prevent accidental startup, disconnect the
hydraulic power before beginning any inspection or
installation task.
Symptom Possible Cause Solution
Tool does not operate. Hydraulic control valve OFF. Turn the hydraulic system control
valve ON.
Hydraulic hoses not connected
properly.
Make sure the hoses are connected
and the couplers are tight.
Hydraulic system not functioning. Check power unit for proper ow and
pressure (7–9 GPM/26–34 LPM,
1000–2000 psi/70–140 bar).
Couplers or hoses blocked. Remove restriction.
Mechanical failure. Disassemble and inspect for damage.
Tool operates in reverse.* Hoses connected to wrong ports on
tool.
Connect input (supply) line to IN port.
Connect output (return) to OUT port.
Low performance Incorrect hydraulic ow. Check power unit for proper ow and
pressure (7–9 GPM/26–34 LPM,
1000–2000 psi/70–140 bar).
Defective quick disconnects. Check quick disconnects.
Fluid leak at motor cap face. Capscrews loose. Contact an authorized STANLEY
distributor to seal and tighten to
recommended torque value.
Face O-ring worn or missing. Replace as required.
Motor cap or main body assemblies
damaged.
Replace as required.
Fluid leaks. Damaged O-rings Contact an authorized STANLEY
distributor.
Wrong hydraulic uid. Circuit too hot. See HTMA Requirements section.
Hoses connected to wrong ports on
tool.
Connect input (supply) line to IN port.
Connect output (return) to OUT port.
Trigger di󰀩cult to operate. Hoses connected to wrong ports on
tool.
Connect input (supply) line to IN port.
Connect output (return) to OUT port.
Excessive back pressure. If back pressure is greater than 250
psi /17 bar, correct the return line
obstruction or restriction.
TROUBLESHOOTING