Page Number - 7
Form 403750
FlowMaster™ Rotary Driven Hydraulic Pump
7.5A-18100-J03
Troubleshooting
Condition Possible Cause Corrective Action
Pump does not run. No pressure on gauge (72):
- Closed Supply line shut off valve. Open shut-off valve.
- No power to solenoid valve (73). Correct electrical fault.
- Faulty Solenoid (74). Replace solenoid (74).
- Pressure Reducing Valve (77) is Reset Pressure Reducing Valve (77).
set too low.
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Pressure is shown on gauge (72):
- Closed Fluid outlet line. Check outlet line and clear
obstructions.
- Flow Control valve is fully closed. Readjust valve to 3/4 turn open.
- Pump is stalled due to grease Check vent valve in system.
backpressure.
3XPSLVVHL]HGRUGDPDJHG Dismantle the pump and repair
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disassembly and assembly
procedure.
Pump speeds up or runs erratically. Low level of grease or reservoir 5H¿OOUHVHUYRLU
is empty
Follower plate is stuck and separated Check follower plate and container
from grease. for damage.
Pump piston or checks are worn. Disassemble the pump and repair.
Pump runs, but output is low. ,QVXI¿FLHQWK\GUDXOLFÀXLGVXSSO\ Check hydraulic supply and adjust
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Inlet pressure too low. Increase pressure using valve (77).
Faulty inlet (25, 27) , faulty discharge Replace faulty components.
check (18, 19) or damaged O-ring (26).
Weepage from housing cover 30. Cup seal (15) or O-Ring (13b) wore out. Check the seals and replace if
necessary.
Pump becomes noisy. No crank case oil. Add crank case oil. Remove Pipe
Plug (67a) from Pump Housing (67).
Oil level should be at the bottom of
the Pipe Plug opening.
Worn wrist pin bushing (12). Check the bushings and replace if
necessary.
Pump does not build pressure. Foreign material holding lower Dismantle & clear check. Consider
check open. installing strainer 272180©
before returning pump to service.
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