SECTION IX FAULT DIAGNOSIS
The lift is only partially raised
–
Check lift adjustments.
The lift is lowered too slowly
–
Check that the “lowering” valve is not sticking.
The lift oscillates rhythmically
–
Check adjustment and pressure relief valve settings.
When the lift arms are raised to maximum height, the pressure relief valve
discharges continuously
–
Check adjustment.
Control valve spool worn (with internal leaking).
Auxiliary hydraulic systems
Implements connected to the hydraulic system do not operate correctly
– Implements not suited to characteristics of the hydraulic system.
–
Fault in the hydraulic lift system. See lift unit.
–
Incorrect type/quantity of oil in the circuit: change and/or top up trans-
mission oil.
–
Oil filters clogged: renew filters.
–
Oil pump worn or defective: overhaul or replace as necessary (opera-
tions to be carried out by a specialised service centre).
–
Safety valve setting incorrect:
•
Check valve pressure setting and adjust if necessary (operations
to be carried out by a specialised service centre).
–
Incorrect adjustment of control levers:
•
Adjust (operations to be carried out by a specialised service centre).
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