Komatsu H70051 Series Operation & Maintenance Manual page 307

OPERATION
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.
Engine does not start.
("L04" lights up on monitor.)
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
HST
Engine runs but machine does not
move.
Machine moves slowly and lacks
power even with engine running at
full throttle.
Oil is overheated.
Noise is generated.
Main causes
Defective wiring
Defective starting motor
Battery disconnect switch at OFF
Engine shutdown secondary switch
at "engine stop" position
Insufficient battery charge
Insufficient battery charge
Defective starting motor
Insufficient battery charge
Defective starting motor
Defective wiring
Defective ring gear and pinion
Insufficient battery charge
Defective wiring
Defective heater relay, heater control-
ler and temperature sensor
Defective monitor
Damaged data in the controller
Other system troubles
Main causes
Parking brake is applied.
Directional lever is not shifted in posi-
tion completely.
There is no electric current in the di-
rectional lever.
Lack of oil in the hydraulic tank
Lack of oil in the hydraulic tank
Hydraulic oil temperature is low.
Insufficient or excessive oil in the hy-
draulic tank
Oil cooler core is clogged
Lack of oil in the transfer case
TROUBLES AND ACTIONS
Remedy
Check, repair. (*)
Replace. (*)
Turn ON.
Set it "NORMAL" position.
Install cover.
Charge battery.
Charge battery.
Replace. (*)
Charge battery.
Replace. (*)
Check, repair. (*)
Charge battery.
Check, repair. (*)
Replace. (*)
Replace. (*)
Check, repair. (*)
Check, repair. (*)
Remedy
Release the parking brake.
Set the lever completely in position.
Check the fuse and wiring harness
Add oil to specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Add oil to specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Perform warm-up operation.
Add oil to the specified level or drain
oil to the specified level by referring
to EVERY 100 HOURS MAINTE-
NANCE.
Clean the oil cooler core.
Add oil to the specified level by refer-
ring to WHEN REQUIRED.
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