RHINOCEROS XN08, Operation & Maintenance Manual

Page: 41 / 52

41
Symptom Possible causes How to solve
The sealing component of central rotation
connector is aged and damaged.
Change the sealing component
The left and right crawlers are of different
tightening.
Adjust
Boom (bucket rod and
bucket) move to one
direction only.
Main valve core is stuck or valve rod spring
breaks.
Repair or change
Boom (bucket rod and
bucket) does not move.
Boom valve rod is stuck or of low
overloaded pressure
Repair
Fuel supply pipe leaks, detached, O ring
damaged or pipe fitting is loose
Change the damaged component
Sandstone in main valve or the low pressure
chamber is connected to the high pressure
chamber
Change
Boom (bucket rod and
bucket) drops too quick
or the cylinder drops at a
certain height even it is
not operated due to dead
weight
Low overloaded valve pressure Adjust
Serious internal leak of cylinder
Change the sealing component, repair
the inner wall or groove of cylinder
or change the cylinder.
Loose oil pipe fitting, damaged O ring Change
Boom (bucket rod and
bucket) works
powerlessly
Serious internal leak of multiway valve or
sandstone inside it
Change
Low overloaded pressure Adjust
Serious internal leak of oil cylinder Change the oil seal
The main valve is disabled due to internal
leak.
Repair or change
Boom (bucket rod and
bucket) moves even it is
not operated
Multiway valve core is stuck or serious
internal leak
Grind or change
Multiway valve rod spring breaks Change
Leak of working cylinder, or the working
device drops due to dead weight
Change the oil seal
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