Komatsu PW118MR-11 Operation & Maintenance Manual page 324

TROUBLES AND ACTIONS
Problem
Charge level caution lamp does not
go out even when engine is running.
Unusual noise is generated from al-
ternator.
Starting motor does not rotate even
when starting switch is turned to
START position.
Pinion of starting motor repeats en-
gaging and disengaging (rattles).
Starting motor turns engine sluggish-
ly.
Starting motor disengages before
engine starts.
Preheating pilot lamp does not light
up.
Oil pressure caution lamp does not
light up when engine is stopped
(starting switch is at ON position).
When startability at low temperature
is poor, if you touch the outside of
the electric heater by hand after pre-
heating, it is not felt warm.
Engine does not start.
(L04 lights up on monitor.)
When travel lever is operated, travel
alarm does not sound.
Rearview monitor displays nothing.
(Machine with rearview camera)
3-252
Main causes
Defective alternator
Defective wiring
Loose fan belt
Defective alternator
Defective wiring
Defective starting motor
Insufficient battery charge
Battery disconnect switch at OFF po-
sition
Engine shutdown secondary switch
at "engine stop" position
Insufficient battery charge
Defective safety relay
Insufficient battery charge
Defective starting motor
Defective wiring, defective ring gear
and pinion
Insufficient battery charge
Defective wiring
Defective heater relay
Defective monitor
Defective monitor
Defective caution lamp switch
Defective wiring
Wire breakage in electrical intake air
heater
Defective operation of heater relay
Blown fuse of heater
Damaged data in the controller
Other system troubles
Defective wiring
Defective alarm
Defective PPC pressure sensor
Defective wiring
Defective camera
Defective monitor
WENAM00130
Remedy
Replace. (*)
Check, repair. (*)
Check fan belt tension and replace.
(*)
Replace. (*)
Check, repair. (*)
Replace. (*)
Charge battery.
Turn ON.
Set it to "Normal" position and install
a cover to it.
Charge battery.
Replace. (*)
Charge battery.
Replace. (*)
Check, repair. (*)
Charge battery.
Check, repair. (*)
Replace. (*)
Replace. (*)
Replace. (*)
Replace. (*)
Check, repair. (*)
Replace. (*)
Replace. (*)
Replace. (*)
Check, repair. (*)
Check, repair. (*)
Check and repair loose connector ter-
minal or wire breakage. (*)
Replace. (*)
Replace. (*)
Check and repair loose or discon-
nected connector or wire breakage.
(*)
Replace. (*)
Replace. (*)
OPERATION