Engine Does Not Crank When Starting Switch Is Turned To Start Position - Komatsu PC88MR-10 Shop Manual

S-1 Engine does not crank when starting switch is turned to START
position
(D65-A26-400-A-Z0-A)

Engine does not crank when starting switch is turned to START position.

Failure
See E mode (E-1) for troubleshooting of electrical system.
Related
If any failure code is displayed, perform troubleshooting for that code first.
information
No. Cause
Defective wiring harness in
1
starting circuit
Defective starting motor
2
Broken flywheel ring gear
3
Cracked EGR cooler
(Reference: coolant in
4
exhaust gas)
PC88MR-10
Point to check, remarks
When starting switch is turned to START
position, starting motor pinion is not pushed
out
Grating noise is heard from starting motor
pinion.
(When starting switch is turned to START
position, starting motor pinion is pushed
out.)
Starting motor pinion disengages during
operation.
(When starting switch is turned to START
position, starting motor pinion is pushed
out.)
Rattling noise is heard and starting motor
does not rotate.
(When starting switch is turned to START
position, starting motor pinion is pushed
out.)
(Reference: Rattling noise is caused when
starting motor pinion is repeatedly pushed
out and pulled in.)
If grating noise is heard from starting motor
pinion and starting motor does not rotate,
visually check flywheel ring gear.
Remove EGR cooler outlet gas piping and
check whether coolant containing
COOLANT flows out.
a Water in exhaust gas can be normally
condensed, so check that condensate is
coolant or not.
40 Troubleshooting
Troubleshooting of engine (S-mode)
Remedy
Perform
troubleshooting for E-1
and take remedies.
Perform
troubleshooting for E-1
and take remedies.
Replace if damaged
Replace EGR cooler
and drain water from
engine cylinders
40-515