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4 – 1
ᵒ
T
ROUB
LE SH
OO
TIN
G
4-1 TROUBLE AND ACTION
Detect the occurrence of anything unusual in its early stages by well getting hold of the normal
performance and condition of the machine while at daily operation.
When detecting anything unusual, investigate the cause, and make the repair.
When keeping the operation continue by neglecting anything unusual, it is in danger of relating
with further big trouble.
SYMPTOM
Operating lever
is felt hard or
does not return
automatically.
All operation are
fail or force and
speed decrease.
Travel of left,
right, or both
sides are
inoperable.
Straight travel
defective
Swing is
inoperable or
smooth swing
is inoperable.
Digging force
defective
PROBABLE CAUSE
• Failed of lubricating lever working part.
• Control valve damaged.
• Low hydraulic oil
• Suction strainer clogged.
• Engine output drop.
• Pump or coupling damaged.
• Improper viscosity hydraulic oil.
• Main relief valve pressure too low.
• Control valve damaged.
• Clogging foreign matter such as stone.
• Defective travel motor or reduction.
• Defective brake valve.
• Clogging foreign matter.
• Shoe tension unequal.
• Defective pump
• Loosen travel lever stopper.
• Defective motor or brake valve.
• Fail lubricate of swing bearing.
• Defective motor.
• Defective brake valve.
• Defective cushion valve.
• Low hydraulic oil
• Improper viscosity hydraulic oil.
• Main relief valve pressure too low.
• Control valve damaged.
• Internal leakage of hydraulic cylinder
ACTION
• Lubricate
• Repair or replace.
• Replenish hydraulic oil.
• Clean filter element.
• Clean air cleaner and inspect fuel system.
• Repair or replace.
• Replace hydraulic oil with recommended
viscosity.
• Check and adjust pressure.
• Repair or replace.
• Remove foreign matter.
• Repair or replace.
• Repair or replace.
• Remove foreign matter.
• Adjust to properly tension on both sides.
• Repair or replace.
• Adjust and tighten nut.
• Repair or replace.
• Lubricate swing bearing.
• Repair or replace.
• Repair or replace.
• Repair or replace.
• Replenish hydraulic oil.
• Replace hydraulic oil with recommended
viscosity.
• Check and adjust pressure.
• Repair or replace.
• Repair or replace.
Содержание 55N3
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