RHINOCEROS XN08, Operation & Maintenance Manual

Page: 40 / 52

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