WCM CTX8010 Operations & Parts Manual page 46

Symptom
other abnormalities)
Indifferent left and right
rotation speed (no other
abnormalities)
Delayed or powered
rotation (no other
abnormalities)
The rotation mechanism
moves even it is operated
The excavator makes
abnormal noise and
shakes during operation.
Powerless oil cylinder or
oil leak
Possible causes
Rotary valve rod on main valve is stuck.
Rotary motor is damaged
The rotation support is damaged.
The right and left rotation of multiway valve
is of different overloaded pressure
Rotation valve rod of multiway valve is
slightly stuck.
Serious external leak of hydraulic oil pipe
Low overloaded pressure for rotation of
multiway valve
Serious internal leak of rotary motor
The high and low pressure chambers of
multiway valve are connected, sand hole on
valve body due to casting, which causes one-
way action or linked actions
Main valve rod spring breaks
Low oil level of hydraulic oil tank
The oil contains too much moisture and air
Safety valve of multiway valve makes noise
Damaged coupling
Vibration caused by loose pipe clamp
Blocked filter
Air exists in oil suction hose
Uneven engine rpm
The bearing of working
lubricated or scraped
Damaged sealing components
A groove is found on the piston rod due to
abrasion or detachment of chromium coating
of piston rod, which causes oil leak.
The air in the cylinder causes shaking noise
during operation
device is not Apply lubrication oil or change the
42
How to solve
Repair
Repair or change
Change
Adjust
Change pipe fitting and sealing
components
Adjust
Repair or change
Change
Change
Add oil
Change
Adjust
Change
Adjust
Change
Release the air
Adjust
shaft or sleeve
Change the sealing components
Coat, paint, repair or change
Release the air