6--7
62--11161
6.4 STARTER SERVICING (Continued)
6.4.6 Armature
6.4.6.a Continuity Check
1. Check the continuity across the commutator and the
armature with an ohmmeter.
2. If there is continuity, replace the armature.
3. Check the continuity across the segments of the com-
mutator with an ohmmeter.
4. If there is no continuity, replace the armature.
6.4.6.b Commutator and Mica
1. Check the contact pattern of the commutator for
wear, and grind the commutator with emery cloth if it
is slightly worn.
2. Measure the commutator O.D. with an outside mi-
crometer at several points.
3. If the minimum O.D. is less than the allowable limit,
replace the armature.
4. If the difference of the O.D.’s exceeds the allowable
limit, correct the commutator on a lathe to the factory
specifications.
5. Measure the mica undercut.
6. If the undercut is less than the allowable limit, correct
it with a saw blade and chamfer the segment edges.
1. Segment
2. Depth of Mica
3. Mica
(
a
). Correct
(
b
). Incorrect
