ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S100
Commutator and Mica
1. Examine the contact of the commutator for wear, and grind the
commutator with emery paper if it is lightly worn.
2. Measure the commutator O.D. with an external micrometer at
some points.
3. If the minimum O.D. is less than the allowable limit, replace the
armature assembly.
4. Calculate the difference of the outer diameters. If it is more than
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.
(To be continued)
Commutator O.D.
Factory
spec.
D1503-M,
D1703-M,
V2003-M,
V2203-M,
D1803-M-DI,
D1703-M-BG,
V2003-M-BG,
V2003-M-T-BG,
V2203-M-BG
30.0 mm
1.18 in.
D1803-M,
V2403-M,
V2403-M-T,
V2403-M-DI,
V2403-M-DI-T,
V2403-M-BG
35.0 mm
1.38 in.
Allowable
limit
D1503-M,
D1703-M,
V2003-M,
V2203-M,
D1803-M-DI,
D1703-M-BG,
V2003-M-BG,
V2003-M-T-BG,
V2203-M-BG
29.0 mm
1.14 in.
D1803-M,
V2403-M,
V2403-M-T,
V2403-M-DI,
V2403-M-DI-T,
V2403-M-BG
34.0 mm
1.34 in.
Difference of outer
diameters
Factory spec.
Less than
0.02 mm
0.0008 in.
Allowable limit
0.05 mm
0.002 in.
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