XCMG XDN450, Operation Manual, Page: 97 / 126

!
4
）
Phenomenon: Vibration and Noise
No. Causes Measures
1
H y d r a u l i c
pump
cient fluid causes suction Make up the fluid
Hydraulic pump suction position is too
high
Adjust the hydraulic pump suction
Suction pipe is not tightly sealed and
air is sucked in
Strengthen the suction pipe seal
The viscosity of the oil is too large and
it is difficult to absorb oil
Replace hydraulic oil
Working temperature is too low Increase operating temperature or tank
heating
Oil filter blocked oil suction Cleaning the oil filter
Hydraulic pump speed is too high Select the appropriate speed
Improper installation of the hydraulic
pump, the pump shaft is different from
the prime mover
Reinstall the hydraulic pump
Loose coupling Tighten the coupling
Hydraulic pump manufacturing
accuracy is too low
Replace parts with poor accuracy and
reassemble
Hydraulic wear parts wear Replace worn parts
Hydraulic pump is too pulsating Repair or replace the pump
2
Relief valve
Seat damage Repair valve seat
Damping hole plugging Cleaning orifice
Excessive gap between valve plug and
valve body
Replace spool, reconfigure gap
Spring fatigue or damage makes valve
movement inflexible
Replace spring
Body pulls or dirt stuck on the spool Removal of burrs, cleaning of dirt,
sliding movement of spool
76