11 - HYDRAULIC SYSTEM
204
12. TROUBLESHOOTING
CONDITION POSSIBLE CAUSE CORRECTION
Implement fails to rise when lever is in
raised position (or implement falls too
quickly when engine is stopped)
Relief valve setting too low
Faulty safety valve
O-ring failure on piston or on control
valve connection to HPL cover
Perform system relief valve pressure
test
Repair or replace safety valve
Replace seal, piston, or cylinder as
required
Implement rises too slowly Excessive leakage past piston seal
Faulty safety valve
Faulty oil pump
Restricted filter
Defective priority valve
Inspect cylinder and piston;
Repair or replace
Repair or replace safety valve
Perform flow test and replace
Pump as required
Replace filter
Repair or replace control valve
Implement will not descend when
control lever is in the lowering position
Flow control valve in closed position Open flow control valve
Implement does not rise to full height Feedback plate on the lift arm shaft out
of adjustment
Adjust feedback plate position
Oil overheats Faulty pump
Faulty HST
Restricted filter
Replace pump
Replace HST
Replace filter
Relief valve operates when implement
is in full raised position
Feedback plate on the lift arm shaft out
of adjustment
Adjust feedback plate position
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