Carter CT08 - Page 40

Symptom
Possible causes
How to solve
The sealing
component
of central
rotation
Change the sealing component
connector is aged and damaged.
The left
and
right
crawlers are
of
different
Adjust
tightening.
Boom (bucket rod and
Main valve core is stuck or valve rod spring
bucket) move to one
Repair or change
breaks.
direction only.
Boom
valve
rod
is
stuck or
of
low
Repair
overloaded pressure
Boom (bucket rod and
Fuel supply
pipe
leaks, detached,
O
ring
Change the damaged component
damaged or pipe fitting is loose
bucket) does not move.
Sandstone in main valve or the low pressure
chamber is connected to the high pressure
Change
chamber
Boom (bucket rod and
Low overloaded valve pressure
Adjust
bucket) drops too quick
Change the sealing component, repair
or the cylinder drops at a
Serious internal leak of cylinder
the inner wall or groove of cylinder
certain height even it is
or change the cylinder.
not operated due to dead
weight
Loose oil pipe fitting, damaged O ring
Change
Serious
internal
leak of
multiway
valve or
Change
sandstone inside it
Boom (bucket rod and
Low overloaded pressure
Adjust
bucket) works
Serious internal leak of oil cylinder
Change the oil seal
powerlessly
The main
valve
is
disabled due
to
internal
Repair or change
leak.
Multiway
valve
core is stuck
or
serious
Grind or change
internal leak
Boom (bucket rod and
Multiway valve rod spring breaks
Change
bucket) moves even it is
Leak of working cylinder, or the working
Change the oil seal
not operated
device drops due to dead weight
Low pressure of overload overflow valve or
Adjust to specified pressure. Change
the spring breaks
the spring if it is broken.
Wrong grade of hydraulic oil for excavator
Change the hydraulic oil
Hot hydraulic oil
Hydraulic oil cooler surface is polluted by oil
Wash
and dirt, which blocks the air hole.
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
Change the elements in time
device are delayed and powerless. The hot
temperature degrades the hydraulic oil. The
safety valve is of poor air tightness, which
leads to overflow.
No action of rotation (no
Hydraulic oil pipe breaks
Change
40