HANGCHA CPD30J - Control Valve

24
Control valve
Trouble
Probable cause
Corrective action
Pressure of relief
valve is not steady
or too low.
Loose of pressure-adjust screw.
Readjusted and retighten.
Distorted or damaged pressure-adjust
spring.
Replace.
Worn or blocked relief valve core.
Replace or clean.
Pump abated.
Examine and repair pump.
Fork tilt forward
when control lever
is used while
engine is off.
Worn or damaged tilt lock valve.
Replace valve core and tilt lock valve
as an assembly.
Broken tilting lock spring.
Replace spring.
Damaged tilt valve plunger O-ring.
Replace O-ring.
Mast is unstable
when tilting forward.
Malfunctioning tilt relief valve.
Replace tilt relief valve assembly.
Lowering distance
of mast is big when
spool valve is in
the centre.
Valve body and spool valve is worn and
clearance between them is too great.
Replace spool valve with specified
clearance.
Spool valve is not in centre.
Keep being in the centre.
Cylinder seal abated.
Examine and repair cylinder.
Taper valve is worn or blocked by dirt.
Replace or clean taper valve.
Spool valve is not
return neutral
position.
Damaged or distorted reposition-spring.
Replace spring.
Dirt exist between valve body and spool
valve.
Clean.
Blocked control device.
Adjusted.
Not coaxial parts at reposition
Reinstall.，be coaxial
Leakage
Damaged O-ring.
Replace.
Faulty seal of joint.
Check and retighten.
LOOSE SEAL PLATE.
Clean seal plate and retighten blots.
Loosed lock-nut of relief valve and
connect-nut between plate and plate.
Tighten.