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TROUBLES AND ACTIONS
Problem
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.)
PHENOMENA AND ACTIONS FOR CHASSIS
•
For the remedies indicated with (*) in the remedy column, always contact your Komatsu distributor.
•
In cases of problems or causes which are not listed below, ask your Komatsu distributor for repairs.
Problem
Speed of travel, swing, boom, arm,
bucket is slow
Pump generates abnormal noise.
(sucking in air)
Excessive rise in hydraulic oil temper-
ature
3-274
Main causes
Defective wiring
Defective starting motor
Insufficient battery charge
Battery disconnect switch is turned
OFF
Engine shutdown secondary switch is
at "STOP ENGINE" position
Insufficient battery charge
Defective safety relay
Insufficient battery charge
Defective starting motor
Defective wiring, defective ring gear
or pinion
Insufficient battery charge
Defective wiring
Defective heater relay
Defective monitor
Defective monitor
Defective oil pressure caution switch
Defective wiring
Wire breakage in electrical intake air
heater
Defective operation of heater relay
Fuse of the heater is blown.
Damaged data in the controller
Other system troubles
Main causes
Lack of hydraulic oil
Clogged element in hydraulic tank
strainer, lack of oil
Loose fan belt
Dirty oil cooler
Lack of hydraulic oil
Remedy
Check, repair. (*)
Replace. (*)
Charge battery.
Turn ON.
Set it "NORMAL" position.
Install cover.
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. (*)
Remedy
Set oil to specified level. See
CHECKS BEFORE STARTING.
Clean. See EVERY 2000 HOURS
MAINTENANCE.
Check fan belt tension and replace.
(*)
Clean. See EVERY 500 HOURS
MAINTENANCE.
Set oil to specified level. See
CHECKS BEFORE STARTING.
OPERATION
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