SHANDONG CARTER HEAVY INDUSTRY MACHINERY CO., LTD.
81
Low pressure of overload overflow valve or
the spring breaks
Adjust to specified pressure. Change
the spring if it is broken.
Hot hydraulic oil
Wrong grade of hydraulic oil for excavator
Change the hydraulic oil
Hydraulic oil cooler surface is polluted by oil
and dirt, which blocks the air hole.
Wash
Low oil level of hydraulic oil tank Add enough hydraulic oil
The hydraulic components such as motor,
main valve and oil cylinder or sealing
components are seriously worn and cause
internal leak, which increases the oil
temperature. Traveling rotation and working
device are delayed and powerless. The hot
temperature degrades the hydraulic oil. The
safety valve is of poor air tightness, which
leads to overflow.
Change the elements in time
No action of rotation (no Hydraulic oil pipe breaks Change
Symptom
Possible causes
How to solve
other abnormalities)
Rotary valve rod on main valve is stuck.
Repair
Rotary motor is damaged Repair or change
The rotation support is damaged.
Change
Indifferent left and right
rotation speed (no other
abnormalities)
The right and left rotation of multiway valve
is of different overloaded pressure
Adjust
Rotation valve rod of multiway valve is
slightly stuck.
Delayed or powered
rotation (no other
abnormalities)
Serious external leak of hydraulic oil pipe
Change pipe fitting and sealing
components
Low overloaded pressure for rotation of
multiway valve
Adjust
Serious internal leak of rotary motor Repair or change
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
Change
The rotation mechanism
moves even it is operated
Main valve rod spring breaks
Change
The excavator makes
abnormal noise and
shakes during operation.
Low oil level of hydraulic oil tank Add oil
The oil contains too much moisture and air Change
Safety valve of multiway valve makes noise Adjust
Damaged coupling Change
Vibrationcausedbyloosepipeclamp Adjust
Blocked filter
Change
Air exists in oil suction hose Release the air
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