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Troubleshooting
Condition
Pump does not run.
Pump speeds up or runs erratically.
Pump runs, but output is low.
Weepage from housing cover (35).
Pump becomes noisy.
Pump does not build pressure.
Possible cause
Low inlet pressure:
• Closed supply line shut-off valve.
• No power to solenoid coil (67).
• Faulty solenoid coil (67).
• Faulty pressure control valve (69).
• Insufficient hydraulic fluid supply.
Sufficient inlet pressure:
• Closed fluid outlet line.
• Flow control valve (68) is fully closed.
• Pump is stalled due to grease back-pressure.
• Pump is seized or damaged.
Low-level of grease or reservoir is empty.
Follower plate is stuck and separated
from grease.
Pump piston or checks are worn.
Insufficient hydraulic fluid supply
Inlet pressure low
Faulty inlet (29), (30), faulty discharge
check (23), (24) or damaged O-ring (27)
Worn cup seal (16) or O-ring (14)
Crankcase needs oil.
Worn wrist pin bushing (12).
Foreign material holding lower check open.
15
Corrective action
• Open shut-off valve.
• Correct electrical fault.
• Replace solenoid coil (67).
• Replace pressure control valve (69).
• Check hydraulic supply for proper pressure and flow.
• Check outlet line and clear obstructions.
• Readjust valve to
1
/
turn open.
4
• Check vent valve in system.
• Dismantle the pump and repair defective or seized
component.
Refill reservoir.
Check follower plate and container for damage.
Disassemble the pump and repair.
Check hydraulic supply and adjust flow control valve (68).
Replace pressure control valve (69).
Replace faulty components.
Check seals and replace if necessary.
Check dipstick (31) and fill with oil as required.
Check the bushings and replace if necessary.
Dismantle and clear check.
Consider adding grease filter to system.
Table 2
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