wsm V3307-DI-T-E2B Workshop Manual page 146

V3307-DI-T-E2B, WSM
Commutator and Mica
1. Check the contact face 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 if with a saw
blade and chamfer the segment edges.
Factory spec.
Commutator O.D.
Allowable limit
Factory spec.
Mica under cut
Allowable limit
(1) Segment
(2) Depth of Mica
(3) Mica
Brush Wear
1. If the contact face of the brush is dirty or dusty, clean it with emery
paper.
2. Measure the brush length (A) with vernier calipers.
3. If the length is less than the allowable limit, replace the yoke
assembly and brush holder.
Factory spec.
Brush length (A)
Allowable limit
(A) Brush Length
Brush Holder
1. Check the continuity across the brush holder and the holder
support with an ohmmeter.
2. If it conducts, replace the brush holder.
Brush holder –
Resistance
Holder support
S-77
ENGINE
32.0 mm
1.26 in.
31.4 mm
1.24 in.
0.50 mm
0.020 in.
0.20 mm
0.0079 in.
(a) Good
(b) Bad
W1075277
18.0 mm
0.709 in.
11.0 mm
0.433 in.
W1075476
Infinity
W1076066
KiSC issued 01, 2009 A