Problem Main causes Remedy
Starting motor does not rotate even
when starting switch is turned to
START position.
Defective wiring Check, repair. (*)
Defective starting motor Replace. (*)
Battery disconnect switch at OFF Turn ON.
Engine shutdown secondary switch
at “engine stop” position
Set it “NORMAL” position.
Install cover.
Insufficient battery charge Charge battery.
Pinion of starting motor repeats en-
gaging and disengaging (rattles).
Insufficient battery charge Charge battery.
Defective starting motor Replace. (*)
Starting motor turns engine sluggish-
ly.
Insufficient battery charge Charge battery.
Defective starting motor Replace. (*)
Starting motor disengages before
engine starts.
Defective wiring
Defective ring gear and pinion
Check, repair. (*)
Insufficient battery charge Charge battery.
Preheating pilot lamp does not light
up.
Defective wiring Check, repair. (*)
Defective heater relay, heater control-
ler and temperature sensor
Replace. (*)
Defective monitor Replace. (*)
Engine does not start.
(“L04” lights up on monitor.)
Damaged data in the controller Check, repair. (*)
Other system troubles Check, repair. (*)
PHENOMENA AND ACTIONS FOR CHASSIS
• Contact your Komatsu distributor for the remedies indicated with (*) in the remedy column.
• Ask your Komatsu distributor for repairs for problems or causes which are not listed below.
Problem
Main causes Remedy
HST
Engine runs but machine does not
move.
Parking brake is applied. Release the parking brake.
Directional lever is not shifted in posi-
tion completely.
Set the lever completely in position.
There is no electric current in the di-
rectional lever.
Check the fuse and wiring harness
Lack of oil in the hydraulic tank
Add oil to specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Machine moves slowly and lacks
power even with engine running at
full throttle.
Lack of oil in the hydraulic tank
Add oil to specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Hydraulic oil temperature is low. Perform warm-up operation.
Oil is overheated.
Insufficient or excessive oil in the hy-
draulic tank
Add oil to the specified level or drain
oil to the specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Oil cooler core is clogged Clean the oil cooler core.
Noise is generated. Lack of oil in the transfer case
Add oil to the specified level by refer-
ring to WHEN REQUIRED.
OPERATION TROUBLES AND ACTIONS
3-239
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