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If symptoms of poor performance develop, the follow-
ing 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 listed
PROBLEM
Tool doesn't run.
Tool doesn't drill effectively.
in the table. Use a flowmeter known to be accurate.
Check the flow with the hydraulic oil temperature at
least 80°F/27°C.
CAUSE
Power unit not functioning.
Couplers or hoses blocked.
Pressure and return line hoses
reversed at ports.
Mechanical failure of piston or
automatic valve.
Power unit not functioning.
Couplers or hoses blocked.
Insufficient air or water
Accumulator charge (pressure
hose pulses more than normal).
Oil too hot (above 140°F).
TROUBLE SHOOTING
SOLUTION
Check power unit for proper
flow and pressure (7-9 gpm
@ 1500-2000 psi).
Remove obstruction.
Be sure hoses are connected to
the proper ports.
Disassemble drill and inspect
for damaged parts.
Check power unit for proper
flow and pressure (7-9 gpm @
1500-2000 psi).
Remove obstruction.
20 cmf minimum.
Recharge accumulator. Replace
diaphragm if charge loss
continues.
Provide cooler to maintain
proper oil temperature
(under 140°F).
continued
16
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