S-98
03-M-DI Series, WSM
DIESEL ENGINE
Commutator and Mica
1. Check the contact of the commutator for wear, and grind the
commutator with emery paper if it is slightly worn.
2. Measure the commutator O.D. with an outside micrometer 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 specification.
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.
W1155802
(2) Alternator
Bearing
1. Check the bearing for smooth rotation.
2. If it does not rotate smoothly, replace it.
W1019790
Commutator O.D.
Factory
spec.
D1503-M-DI
D1503-M-DI-T
D1703-M-DI
D1803-M-DI
V2203-M-DI
30.0 mm
1.181 in.
V2403-M-DI
35.0 mm
1.378 in.
Allowabl
e limit
D1503-M-DI
D1503-M-DI-T
D1703-M-DI
D1803-M-DI
V2203-M-DI
29.0 mm
1.142 in.
V2403-M-DI
34.0 mm
1.339 in.
Difference of O.D.’s
Factory spec.
Less than 0.02 mm
0.0008 in.
Allowable limit
0.05 mm
0.0020 in.
Mica under cut
Factory
spec.
D1503-M-DI
D1503-M-DI-T
D1703-M-DI
D1803-M-DI
V2203-M-DI
0.50 to 0.80 mm
0.0197 to 0.0315 in.
V2403-M-DI
0.50 to 0.90 mm
0.0197 to 0.0354 in.
Allowable limit
0.20 mm
0.0079 in.
(1) Segment
(2) Depth of Mica
(3) Mica
(a) Correct
(b) Incorrect
KiSC issued 10, 2009 A
