Komatsu PC22MR-3, Operation & Maintenance Manual

Page: 205 / 312

FUNCTIONING
TROUBLESHOOTING
3-117
OTHER TROUBLES 3
Electrical circuit 3
q
( ): Always contact the Komatsu distributor when you must carry out these operations.
q
If the anomaly or its cause is not included in the table below, contact your Komatsu distributor for the
necessary repair.
Frame 3
q
( ): Always contact the Komatsu distributor when you must carry out these operations.
q
If the anomaly or its cause is not included in the table below, contact your Komatsu distributor for the
necessary repair.
TROUBLE CAUSE SOLUTION
Lights do not work satisfactorily even
with engine running at high speed.
q
(Faulty cables).
q
(Faulty fan belt tension).
q
(Blown fuse).
q
(Check and repair any loose
terminals and connections).
q
Adjust fan belt tension. See
"Every 500 hours".
q
Change.
Lights come on intermittently with
engine running.
Battery charge warning light does not
go out even with engine running.
q
Faulty alternator.
q
Faulty cables.
q
(Change).
q
(Check and repair).
Alternator emits abnormal noise.
q
Faulty alternator.
q
(Change).
Starter does not turn with ignition
switch in position ON.
q
Faulty cables.
q
Battery charge insufficient.
q
Faulty fuse.
q
Battery main switch turned to
OFF.
q
(Check and repair).
q
Charge battery.
q
Change.
q
Turn the switch to ON.
Starter pinion engages and
disengages repeatedly.
q
Battery charge insufficient.
q
Charge battery.
Starter makes engine run slowly.
q
Battery charge insufficient.
q
Faulty starter.
q
Charge battery.
q
(Change).
Starter disengages before engine
start.
q
Faulty cables.
q
Battery charge insufficient.
q
(Check and repair).
q
Charge battery.
Preheating warning light does not
come on.
q
Faulty cables.
q
Faulty bulb.
q
(Check and repair).
q
(Change).
Engine oil pressure warning light
does not come on when engine stops
(ignition key in position ON).
q
Faulty bulb.
q
Faulty oil pressure switch.
q
(Change).
q
(Change).
TROUBLE CAUSE SOLUTION
The translation speed, rotation,
boom 1, boom 2 and the bucket are
slow.
q
No hydraulic oil.
q
Restore level. See "Checks to be
carried out before starting the
engine".
Pump does not work correctly.
q
Foreign body in the hydraulic tank
filter.
q
Clean. See "Every 2000 hours".
WEAM014500