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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 check that the hydraulic power source is supplying the
correct hydraulic flow and pressure to the grinder, as listed in the table. Use a flow meter known to be accurate.
Check the flow with the hydraulic oil temperature at least 80 °F/27 °C.
PROBLEM
Tool does not run.
Tool does not hit effectively. Power unit not functioning.
Tool operates slow.
TROUBLESHOOTING
CAUSE
Power unit not functioning.
Couplers or hoses blocked.
Pressure and return line hoses
reversed at ports.
Mechanical failure of piston or
internal parts.
Couplers or hoses blocked.
Fluid too hot (above 140 °F/60 °C).
Incorrect tool bit.
Low oil flow from power unit.
High back-pressure.
SOLUTION
Check power unit for proper flow and
pressure 7–9 GPM/26–34 LPM, 1500–
2000 psi/105–140 bar.
Remove restriction.
Be sure hoses are connected to their
proper ports.
Have inspected and repaired by an
authorized dealer.
Check power unit for proper flow and
pressure 7–9 GPM/26–34 LPM, 1500–
2000 psi/105–140 bar.
Remove restriction.
Provide cooler to maintain proper fluid
temperature.
Ensure tool bit meets specifications.
Check power source for proper flow.
Check hydraulic system for excessive
back-pressure and correct as required.
CH18 User Manual ◄ 11
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