Field Coil; Brush - Komatsu 4D98 Series Shop Manual

9. Starting Motor
(2)
Field coil
(a) Field coil continuity test
Check continuity between field coil termi-
nals. Good if continuity exists.
-Nocontinuity
(Coil disconnection)
Replace the field coil.
Fig. 16
(b) Field coil insulation test
Check continuity between field coil termi-
nal and yoke. Good if no continuity ex-
ists.
(Coil short circuit)
Replace the armature.
(3) Brush
Measure the length of the brush. Replace
with a good one if the length is less than
the limit.
Fig. 17
Fig. 18
9-10