4 – 1
TROUBLE SHOOTING
4
4-1 TROUBLE AND REMEDY
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 returm
automatically.
All movements
are impossible
or lack vigour
Travel of left,
right, or both
sides are
impossible.
Unable to travel
straight
Swing is
impossible or
smooth swing
is impossible.
Lack of digging
force
PROBABLE CAUSE
• Lack of lubricating lever working part.
• Poor control valve
• Lack of hydraulic oil
• Hydraulic oil is not yet warm.
• Decreasing of engine output horse
power
• Poor pump or coupling
• Hydraulic oil is not proper
• Lowering of pressure setting of relief
valve
• Poor control valve
• Clogging foreign material such as stone
• Poor control valve
• Malfunction of traction motor or
reduction unit
• Poor brake valve
• Clogging foreign material
• Poor adjustment of shoes belt tension
• Poor pump
• Poor motor or brake valve
• Poor control valve
• Lack of lubricating swing bearing
• Poor cushion valve
• Poor brake valve
• Poor motor
• Lack of hydraulic oil
• Hydraulic oil is not yet warm
• Hydraulic oil is not proper
• Decreasing of engine output horse
power.
• Poor pump
• Lowering of pressure setting of relief
valve
• Poor hydraulic cylinder
• Poor control valve
REMEDY
• Lubricate
• Request repair to distributor for service
and repair.
• Fill to regular level.
• Perform arm-up operation.
• Clean air cleaner and inspect fuel system.
• Request repair to distributor for service and
repair.
• Replace with recommended hydraulic oil.
• Request repair to distributor for service and
repair.
• As above
• Exclude foreign material.
• Request repair to distributor for service and
repair.
• As above
• As above
• Exclude foreign material.
• Adjust to regular dimension on both sides.
• Request repair to distributor for service and
repair.
• As above
• As above
• Lubricate
• Request repair to distributor for service and
repair.
• As above
• As above
• Fill to regular level.
• Perform warm-up operation
• Replace with recommended hydraulic oil.
• Clean air cleaner and inspect fuel system
• Request repair to distributor for service and
repair.
• As above
• As above
• As above
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