Yanmar 3TNV88F Service Manual page 212

STARTER MOTOR
3- Insulation test for armature coil
Check between the commutator and the
shaft (or the armature core) with a tester.
If there is no conduction, it is a non-defective.
Conduction
(Coil short-circuit)
Figure 10-17
4- Vibration of armature core and commutator
Measure the vibration of the armature core
outer diameter and the commutator outer
diameter by placing the dial gauge in the
shaft center.
If it is above the limit, correct or replace it with
a non-defective.
Armature
Commutator
10-12
Replace the armature
046471-00X00
Standard Limit
0.05 mm or less
0.1 mm
0.05 mm or less 0.1 mm
Armature core
Figure 10-18
5- Inspection of commutator outer diameter
surface
If the outer diameter surface of the
commutator is rough, polish it with a No. 500
- 600 sandpaper.
Figure 10-19
3TNV88F Service Manual
Starter Motor
Commutator
046451-00EN00
046450-00X00