Stanley Black & Decker GR30 Manuel D’Utilisation

This section describes how to find and resolve problems 

users may experience. If a situation occurs that is not 

covered, call your Stanley Customer Service represen-

tative for assistance.

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 flow 

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 flow.

Check power unit for proper flow 

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 fluid. 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 difficult 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.

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  flow  and  pressure  to  the  tool  as  list-

ed in the table. Use a flowmeter known to be accurate. 

Check the flow 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.