Carter CT12 - Page 83

SHANDONG CARTER HEAVY INDUSTRY MACHINERY CO., LTD.
80
Symptom Possible causes How to solve
The sealing component of central rotation
connector is aged and damaged.
Change the sealing component
The lefand 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
B oom (bucket rod and
bucket) does not mov
e.
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
certainheightevenitis
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
The left and right traveling motors fail Repair
The oil pipe explodes Change
Wrong adjustment of variable point of main
valve or serious internal leak of a pump
Adjust or repair
Deviation during
Internal or external spring of one traveling
valve core of main valve is damaged or
tightened
Change
traveling (no other
abnormalities)
The traveling motor leaks inside due to
abrasion.
Repair or change