SHANDONG CARTER HEAVY INDUSTRY MACHINERY CO., LTD.
79
Symptom
Possible causes
How to solve
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
The unilateral
crawler
Traveling motor is damaged
fails to move
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
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 whole excavator
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.
moves slowly or
powerless
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
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
The right and left
Serious leak
inside
the traveling operation
valve
Change
traveling systems do
not
move (no other
Low overloaded pressure of traveling valve
of main valve or the valve rod is stuck.
Adjust and grind
abnormalities)
The left and right traveling reducers fail
Repair
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