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 set too low. Reset Pressure Reducing Valve (77).
- Insufficient Hydraulic Fluid supply. Check hydraulic supply for proper pressure and
flow.
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 back pressure Check vent valve in system.
Pump is seized or damaged. Dismantle the pump and repair defective or
seized component. See disassembly and
assembly procedure.
Pump speeds up or runs erratically. Low level of grease or reservoir Refill reservoir.
Pump piston or checks are worn. Disassemble the pump and repair.
Pump runs, but output is low. Insufficient hydraulic fluid supply. Check hydraulic supply and adjust flow using
valve (70).
Inlet pressure too low. Increase pressure using valve (77).
Faulty inlet (25, 27) , faulty discharge check (18, 19) or
damaged O-ring (26).
Replace faulty components.
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 crankcase oil. Add crankcase oil. Remove Pipe Plug (67a) from
Pump Housing (67). Oil level should be at the
bottom of the Pipe Plug opening. For Models
85480, 85481, 85482 and 85483. Check
dipstick to verify. Mobil Arrow HFA Hydraulic Oil
until the crankcase is full.
Worn wrist pin bushing (12). Check the bushings and replace if necessary
Pump does not build pressure. Foreign material holding lower check open. Dismantle & clear check. Consider installing
strainer (272180) before returning pump to
service.
8
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