Greenlee / A Textron Company 10 4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
960 PS Series Hydraulic Power Pumps
Probable Cause
Problem Probable Remedy
Troubleshooting
Motor does not run. Voltage supplied is too low, Check the voltage at the power supply.
or no power at outlet. Refer to the “Specifications” section of this
manual for required voltage.
Extension cord is too long or wire Use a shorter or heavier gauge
gauge is too light. extension cord.
Relay is faulty. Replace relay (63).
Motor is faulty. Repair or replace motor.
Pump develops little pressure Oil level is low. Check oil level. Refer to “Adding Oil” in this
(low-pressure system failure). manual.
Clogged intake screen. Clean or replace intake screen (24).
Faulty low-pressure relief valve. Replace valve (2).
Faulty low-pressure system. Repair low-pressure system. Purchase
Vane Repair Kit. Refer to the repair kits at
the end of the parts list.
Pump develops substantial Low-pressure system failure. Refer to the causes and remedies described
pressure, but doesn’t complete under low-pressure system failure.
the hydraulic operation (high-
pressure system failure). Faulty high-pressure relief valve. Replace valve (1).
Sticking plunger. Replace plunger (8) and bushing (9).
Leaking ball. Re-finish the seats for the 9/32" balls.
Replace the 9/32" balls (26).
Sticking low pressure plunger. Replace plunger (19).
Pressure buildup is erratic. Oil level is low. Check oil level. Refer to “Operation” in
this manual.
Air in hydraulic system. Refer to “Purging (Bleeding) Air from the
System.”
Dirt in the hydraulic system. Refer to “Draining and Flushing
the System.”
Faulty high-pressure relief valve. Replace valve (1).
Sticking plunger. Replace plunger and bushing (8, 9).
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