XCMG XDN450 Operation Manual page 95

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2）Phenomenon: Crawling
No.
Throttle valve or throttle valve flow instability Use
flow control valve with good flow stability
1
Hydraulic
2 cylinder
Mix in the
air
3
U n c l e a n
4
fluid
The viscosity of the oil is not proper.
5
E x t e r n a l
6
friction
Causes
Hydraulic cylinder parts are poorly
machined and assembled with high
friction
Improper installation of hydraulic
cylinder, inconsistent with the axis of
the guide mechanism
Low oil level, poor suction
Filter plug
Suction and drain pipes are too close to
each other
The return pipe is not inserted below
the oil level
Poorly sealed, mixed with air
Hydraulic fluid loss when the machine
stops moving
Dirty stuck in the liquid motive to
increase frictional resistance
Dirt jamming throttling, causing flow
changes
Drag wedge or platen over tighten
Guide rails and other guide mechanism
accuracy is not high, poor contact
Poor lubrication conditions
Measures
Throttle valve or throttle valve flow
instability Use flow control valve with
good flow stability
Replace parts that do not meet
accuracy requirements and reassemble
re-install
Supplement fluid
Cleaning the oil filter
Keep the suction and discharge pipes
away from the setting
Insert the return pipe into the oil
Reinforced seal
Add back pressure valve or check
valve to prevent fluid loss during
shutdown
Cleaning fluid motive, replace oil or
strengthen filter oil
Clean hydraulic valve, replace oil or
filter oil
Change the hydraulic oil with the
specified viscosity.
Re-regulate
Scrape the guide rails as required to
ensure good contact
Improve lubrication conditions
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