XCMG XDN450 Operation Manual page 96

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3）Phenomenon: Impact
No.
Hydraulic
cylinder
1
Throttle opening too large
2
Directional
valve
3
Pressure
4
valve
No back pressure valve installed
5
Vertically-moving hydraulic cylinder lower chamber
6
does not take balancing measures
Mix in the
7
air
Inertia caused by inertia of hydraulic actuator
8
Oil viscosity is too low
9
Causes
Set the buffer device
Repair buffer device check valve
Repair buffer plunger as required
Prepare a buffer plunger or piston
Directional valve or pilot valve brake
cone angle is too large
Hydraulic valve control hydraulic flow
is too large
Improper adjustment of hydraulic valve
damper
Sliding valve movement is not fast
Adjust pressure valve to reduce
working pressure properly
Troubleshooting overflow valve
Appropriately increase back pressure
System does not seal tightly, suck in air Replace seal
Fluid loss of fluid during shut-down
Hydraulic pump suction
Measures
Set the buffer device
Repair buffer device check valve
Repair buffer plunger as required
Prepare a buffer plunger or piston
Adjust the throttle valve
Reduce brake cone angle or increase
brake cone length
Reduce the flow of control pressure oil
Adjust throttle opening in damper
Repair spool valve
Adjust pressure valve to reduce
working pressure properly
Troubleshooting overflow valve
Appropriately increase back pressure
Set back pressure valve or throttle
valve to generate back pressure for oil
return
Set the balance valve to balance the
impact of gravity
A one-way valve or back pressure
valve is installed in the return line to
prevent the loss of oil from the module.
Strengthen the oil suction pipe seal,
make up the oil
Set the brake valve
Replace oil
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