XCMG XDN450 Operation Manual page 94

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Damaged parts
Parts wear, gap is too large, leakage is
serious
Hydraulic
pump
The oil level is too low and the
1
hydraulic pump is empty
Insufficient sealing of suction pipe,
resulting in suction
Pressure oil pipeline is not tightly
sealed, causing leakage
Spring deformation or break
Spool stuck in open position, unable to
build pressure
Relief valve
Pole valve or steel ball and valve seat
2
closely
Damping hole plugging
Remote port to tank
The hydraulic cylinder communicates with the high
3
and low pressure chambers
Some valve unloading in the system
4
Severe system leak
5
Pressure gauge failure causes no pressure artifact
6
Too low viscosity of oil, exacerbating system leakage
7
Excessive temperature leads to reduces oil
8
viscosity
Replace parts
Repair or replace parts
Supplement fluid
Tighten joints, check tubing, strengthen
seals
Tighten joints, check tubing, strengthen
seals
Replace spring
Sliding slide valve makes it flexible
Replacement of poppet or steel ball,
with grinding seat
Cleaning orifice
Cut off the oil circuit of the tank
Repair the piston and replace the seal
Identify unloading reasons and take
appropriate measures
Strengthen sealing to prevent leakage
Replace pressure gauge
Increase oil viscosity
Find out the cause of the heat, take
appropriate measures, or dissipa
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