Servicing; Starter - wsm B2420 Workshop Manual

B2420, WSM

[3] 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.
Factory specification
Commutator O.D.
Allowable limit
Factory specification
Difference of O.D.'s
Allowable limit
Factory specification
Mica undercut
Allowable limit
(1) Segment
(2) Undercut
(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 specification
Brush length (A)
Allowable limit
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
9-S33
ELECTRICAL SYSTEM
28.0 mm
1.10 in.
27.0 mm
1.06 in.
Less than
0.02 mm
0.0008 in.
0.05 mm
0.002 in.
0.60 mm
0.024 in.
0.20 mm
0.0079 in.
(a) Correct
(b) Incorrect
9Y1210436ELS0071US0
14.0 mm
0.551 in.
9.0 mm
0.35 in.
9Y1210436ELS0072US0
Infinity
9Y1210436ELS0014US0
KiSC issued 06, 2012 A