Brush Holder; Magnetic Switch - Komatsu 4D98 Series Shop Manual

9. Starting Motor
(4) Brush holder
(a) Brush holder insulation test
Check the continuity between the brush
holder ( 8 side) and base ( 0 side)
with a multimeter. Good if no continuity
exists.
1 Continuity exists
1
Insulation defect
Replace the brush holder.
(b) Brush spring inspection
Inspect the brush spring pressure.
1 Standard spring pressure 1
1 31-39 N (3.1-3.9 kgf) 1
Fig. 19
Fig. 20
(5) Magnetic switch
When the starting motor is wetted
netic switch with a new even if the
(a) Shunt coil continuity test
Check the continuity between the S ter-
minal and the switch body. Good if conti-
nuity exists.
-Nocontinuity
(Coil disconnection)
Replace the magnetic switch.
Multimeter
El
4
0
Fig. 21
9-11