The main pump supplying fuel to unilateral
The main valve rod is stuck and the spring is
Traveling motor is damaged
The upper and lower chambers of swivel
Change the oil seal or clean the
Fuel pipe of traveling system explodes.
Less oil in hydraulic oil tank
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
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.
decrease of loaded rpm and even flames out.
The blocked hydraulic filter accelerates
Clean and change the element
abrasion of pump, motor and valve and leads
according to the maintenance
Serious between main valve rod and valve
hole causes serious internal leak
Central rotation connector is damaged.
Change the oil seal and change the
The high pressure chamber and low pressure
chamber of traveling operation valve is
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
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
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