ELECTRICAL SYSTEM
B2050, B2350, B2650, B3150, WSM
9-S43
6. SERVICING
[1] STARTER
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, correct the
commutator on a lathe to the factory specification.
4. Measure the mica undercut.
5. If the undercut is less than the allowable limit, correct it with a
saw blade and chamfer the segment edges.
9Y1210982ELS0086US0
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.
9Y1210982ELS0087US0
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.
9Y1210982ELS0088US0
Commutator O.D.
Factory specification
28.0 mm
1.102 in.
Allowable limit
27.0 mm
1.063 in.
Difference of O.D.'s
Factory specification
Less than
0.02 mm
0.0008 in.
Allowable limit
0.05 mm
0.0020 in.
Mica undercut
Factory specification
0.60 mm
0.0236 in.
Allowable limit
0.20 mm
0.0079 in.
(1) Segment
(2) Undercut
(3) Mica
(a) Correct
(b) Incorrect
Brush length (A)
Factory specification
14.0 mm
0.551 in.
Allowable limit
9.0 mm
0.354 in.
Resistance
Brush holder – Holder
support
Infinity
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