HANGCHA CPD30J - Page 35

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Fault
Probable cause
Corrective action
Insufficient lift
power or no lift
movement.
1. Excessive wear occurs between the oil
pump body and gears, causing too much
clearance.
Replace the worn parts or the oil
pump.
2. The lifting jack piston Yx-ring has worn,
resulting in excessive inner leaks.
Replace Yx-ring.
3. Springs of the multiple control valve
and its relief valve are inoperative oil
leaks.
Replace.
4.Excessive wear occurs of the hydraulic
control valve ,resulting in excessive oil
leaks.
Replace.
5. Oil leaks occur between the hydraulic
control valve sections.
Dismantle for regrinding the joint
surfaces and reassemble the valve.
6. Leakage occurs in the hydraulic pipe.
Tighten the joint nuts and inspect
the seal for damage.
7. The hydraulic oil temperature is too
high. Oil viscosity is too low and the rate
is insufficient.
Change the wrong hydraulic oil or
stop operation for reducing the oil
temperature. Find out the reasons
for high oil temperature and
eliminate the trouble.
8. The load carried is beyond the
designed capacity.
Observe the lifting capacity limit.