XCMG XDN450 Operation Manual page 97

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4）Phenomenon: Vibration and Noise
No.
H y d r a u l i c
pump
1
Relief valve
2
Causes
cient fluid causes suction
Hydraulic pump suction position is too
high
Suction pipe is not tightly sealed and
air is sucked in
The viscosity of the oil is too large and
it is difficult to absorb oil
Working temperature is too low
Oil filter blocked oil suction
Hydraulic pump speed is too high
Improper installation of the hydraulic
pump, the pump shaft is different from
the prime mover
Loose coupling
H y d r a u l i c p u m p m a n u f a c t u r i n g
accuracy is too low
Hydraulic wear parts wear
Hydraulic pump is too pulsating
Seat damage
Damping hole plugging
Excessive gap between valve plug and
valve body
Spring fatigue or damage makes valve
movement inflexible
Body pulls or dirt stuck on the spool
Measures
Make up the fluid
Adjust the hydraulic pump suction
Strengthen the suction pipe seal
Replace hydraulic oil
Increase operating temperature or tank
heating
Cleaning the oil filter
Select the appropriate speed
Reinstall the hydraulic pump
Tighten the coupling
Replace parts with poor accuracy and
reassemble
Replace worn parts
Repair or replace the pump
Repair valve seat
Cleaning orifice
Replace spool, reconfigure gap
Replace spring
Removal of burrs, cleaning of dirt,
sliding movement of spool
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