Komatsu WB93R-5, Operation & Maintenance Manual

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TROUBLESHOOTING
161
3.15.4 OTHER TROUBLES
(•) Always contact your Komatsu Dealer when you have to carry out this operation.
• If the anomaly or its cause is not included in the table below, contact your Komatsu Dealer for the necessary
repair.
3.15.4.1 ELECTRICAL CIRCUIT
3.15.4.2 HYDRAULIC SYSTEM
TROUBLE CAUSE REMEDY
Lights do not work satisfactorily even
with engine running at high speed: • Faulty cables.
• Faulty fan belt tension.
(•) Check and repair any loose terminal
and connection.
• Adjust fan tension (see “EVERY 250
HOURS).
Lights come on intermittently with en-
gine running:
Alternator charge warning light does not
go out with engine running and increas-
ing speed: • Faulty alternator.
• Faulty cables.
(•) Change.
(•) Check and repair.
Alternator emits an abnormal noise: • Faulty alternator. (•) Change.
Starter does not turn with key in START
position:
• Faulty cables.
• Battery charge insufficient.
• Faulty engine start fuse.
(•) Check and repair.
• Charge battery.
• Change.
Starter pinion engages and then disen-
gages: • Battery charge insufficient. • Charge battery.
Starter makes engine run slowly:
• Battery charge insufficient.
• Faulty starter.
• Charge battery.
(•) Change.
Starter disengages before engine has
started:
• Faulty cables.
• Battery charge insufficient.
(•) Check and repair.
• Charge battery.
Engine oil pressure warning light does
not come on when engine is stopped
(ignition key in position
« »):
• Faulty bulb.
• Faulty pressure sensor.
(•) Change.
(•) Change.
Alternator charge warning light does not
come on when engine is stopped (igni-
tion key in position « »): • Faulty bulb.
• Faulty cables.
(•) Change.
(•) Check and repair.
TROUBLE CAUSE REMEDY
Pump emits an abnormal noise:
• No oil in the tank.
• Faulty pump.
• Hydraulic oil unsuitable for the tem-
perature.
• Top up.
(•) Repair or change.
• Change.
Equipment control levers do not return
automatically to neutral position: • Broken return spring or seized ele-
ment.
(•) Change spring or distributor ele-
ment.
Equipment moves only at low speed:
• Faulty pump.
• Max. pressure valves out of rating,
or not closed due to impurities.
• Dirty drain filter.
(•) Repair or change.
(•) Calibrate or change.
• Change.
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