Troubleshooting - Komatsu 4D98 Series Shop Manual

9.1.3 Troubleshooting
OI
lnsoection Causes and
item remedies
Inspect the wiring up to the magnetic
YES
NO
meshing normal?
1
. Adjust I dimension.
. Inspect the shift lever for deformation,
. the return spring for fatigue and the
pinion for sliding.
l
Repair meshing between pinion and
ring gear or replace as needed.
Connect the M terminal of
l
Pinion roller clutch damage,
inspection and replacement
l
Reduction gear damage,
inspection and replacement
the individual starting motor
with the battery. Does the
motor run?
YES
l
Inspect the brush and replace if worn.
l
If brushes are not worn, replace the
motor (yoke assy or armature).
0 When the starting motor is wetted with water,
always replace the magnetic switch even if the
, \
YES
Inspect the
fuel systems
normal without any
corrosion?
Replace the Lube
oil.
1
YES
For an abnormality (Immediately disconnect the
battery negative terminal.)
(7)
Repair or replace the key switch, starting
motor relay or magnetic switch.