Troubleshooting - Komatsu 4D98 Series Shop Manual

9.2.3 Troubleshooting
YES
I
\corrosion?
I
,,S
/
Inspect the starting motor relay wiring
system and repair if necessary.
Does the starting . Key switch
motor relay operate?
. Starting motor relay
l
Connection state
1
1
YES
t
Is the starting motor
1
gear (armature, gear
shaft) for damage
magnetic switch actuating
sound heard?
I vet
'( IL.2
Are pinion and ring gear
engaging normally?
YES
t
. Inspect the wiring up to the magnetic
switch and repair if necessary.
l
Adjust the dimension.
. Inspect the shifl lever for deformation,
the return spring for fatigue and the
pinion for sliding.
. Repair engagement between pinion
and ring gear or replace as needed.
-
Replace the motor
NO
(field coil or armature).
+
Is the revolution
normal?
Inspection Causes and
YES remedies
Inspect the ignition
Upon abnormality:
and fuel systems.
Immediately disconnect the battery negative terminal.
Does the engine run
when the starting motor
is replaced with a new
NO
Repair or replace the key switch, starting
motor relay or magnetic switch.
Inspect inside of
the engine.