Komatsu PC118MR-8, Руководство по эксплуатации и обслуживанию

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FUNCTIONING
TROUBLESHOOTING
3-197
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.
TROUBLE CAUSE SOLUTION
Lights do not work satisfactorily even
with engine running at high speed. q
Faulty cables.

q
Faulty fan belt tension.

q
(Check and repair any loose
terminals and connections).
q
Adjust fan belt tension. See pag.
4-51.
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 key in
position START.
q
Faulty cables.
q
Battery charge insufficient.
q
Faulty starter.
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
Faulty safety relay.
q
Charge
q
(Change).
Starter makes engine run slowly.
q
Battery charge insufficient.
q
Faulty starter.
q
Charge
q
(Change).
Starter disengages before engine
start.
q
Faulty cables and pinion.
q
Battery charge insufficient.
q
(Check and repair).
q
Charge
Preheating warning light does not
come on.
q
Faulty cables.
q
Faulty pre-warming relay.
q
Faulty monitor.
q
(Check and repair).
q
(Change).
q
(Change).
Engine oil pressure warning light
does not come on when engine stops
(ignition switch in position ON).
q
Faulty monitor.
q
Faulty oil pressure sensor.
q
(Change).
q
(Change).
The outer part of the electric heater is
notwarm when you approach your
hands to it.
q
Faulty cables.
q
Electric heater disconnected.
q
Faulty heater operation.
q
(Check and repair).
q
(Change).
q
(Change).
The travel alarm does not go off
when the travel lever is operated.
q
Faulty cables.


q
Faulty alarm.
q
Faulty travel PPC pressure
sensor
q
(Check that the terminals of the
connectors are not disconnected
or work slowly; repair them).
q
(Change).
q
(Change).

The starter motor turns but the
engine does not start.
q
Supply circuit of the engine
controller faulty
q
Faulty relay
q
Faulty connector on the engine
side

q
(Change).

q
(Change).
q
(Check that the connectors are
not slow, missing or
disconnected; repair them).
WEAM014802