WCM CTX8010 Operations & Parts Manual page 44

Symptom
The unilateral crawler
fails to move
The whole excavator
moves slowly or
powerless
The right and left
traveling systems do not
move (no other
abnormalities)
Deviation during
traveling (no other
abnormalities)
Possible causes
The main pump supplying fuel to unilateral
crawler is damaged.
The main valve rod is stuck and the spring is
broken
Traveling motor is damaged
The upper and lower chambers of swivel
joint are connected
Fuel pipe of traveling system explodes.
Less oil in hydraulic oil tank
Low engine rpm
Low system safety valve pressure
Serious leak inside the main pump
The traveling motor, rotation motor and
cylinder are worn of different degree, which
causes internal leak.
The aged sealing
hydraulic elements, degraded oil of old
excavator cause the operation speed becomes
powerless along with the increase of
temperature.
The blocked engine filter causes serious
decrease of loaded rpm and even flames out.
The blocked hydraulic filter accelerates
abrasion of pump, motor and valve and leads
to internal leak.
Serious between main valve rod and valve
hole causes serious internal leak
Central rotation connector is damaged.
The high pressure chamber and low pressure
chamber of traveling operation valve is
connected.
Serious leak inside the traveling operation
valve
Low overloaded pressure of traveling valve
of main valve or the valve rod is stuck.
The left and right traveling reducers fail
The left and right traveling motors fail
The oil pipe explodes
Wrong adjustment of variable point of main
valve or serious internal leak of a pump
Internal or external spring of one traveling
valve core of main valve is damaged or
tightened
The traveling motor leaks inside due to
abrasion.
components, worn
40
How to solve
Change
Repair or change
Change
Change the oil seal or clean the
assembly
Change
Add enough hydraulic oil
Adjust engine rpm
Adjust to specified pressure
Change or repair the pump
Change or repair the worn parts
Change hydraulic oil, change sealing
components of the whole machine,
adjust the fit clearance and pressure
of hydraulic components.
Change the element
Clean and change the element
according to the maintenance
schedule.
Repair the valve rod
Change the oil seal and change the
groove if it is damaged
Change
Change
Adjust and grind
Repair
Repair
Change
Adjust or repair
Change
Repair or change