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16 ► GR30 User Manual
This section describes how to nd and resolve problems
users may experience. If a situation occurs that is not
covered, call your Stanley Customer Service represen-
tative for assistance.
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 difcult 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 ow and pressure to the tool as list-
ed in the table. Use a owmeter known to be accurate.
Check the ow with the hydraulic oil temperature at least
80° F/27° C.
WARNING
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.
TROUBLESHOOTING