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Malfunctions and solutions
Noisy hydraulic pump and
vibratory pipeline
1． Hydraulic malfunction.
2． Air bubble in hydraulic
system.
3． Aging hydraulic oil,
degenerative oil mixed with
moisture, wrong brand and
specification produce
bubble.
4． Low hydraulic oil
temperature and high
viscidity of hydraulic oil.
1． Consult with your
dealer.
2． Check whether air
leakage at oil pump inlet
pipeline.
3． Replace oil.
4． Run engine in low revs
and then warm up the
engine.
Control levers don’t work
or work slowly.
1． The machine is out of use
for a long time, air
separates from oil and
floats in pilot control
pipeline and hydraulic
cylinder,etc.
2． No pressure or exceeding
pressure in pilot system.
3． Low hydraulic oil
temperature and high
viscidity of hydraulic oil
4． Hydraulic pump
malfunction.
5． Main safety relief valve
malfunction
1． Operate control levers
for several times.
2． Check hydraulic control
system, low-pressure
relief valve, and gear
pump.
3． Warm up machine.
4． Consult with your
dealer.
5． Consult with your
dealer.
A cylinder doesn’t work
or work slowly.
1． Corresponding pilot valve
malfunction
2． Corresponding
commutator valve
malfunction
3． Corresponding overload
valve malfunction
4． Hydraulic cylinder pole
damaged
5． Hydraulic cylinder interior
seals damaged
1． Repair
2． Consult with your dealer
3． Consult with your dealer
4． Consult with your dealer
5． Replace oil seals
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