wsm L503 Workshop Manual page 541

L3130 · L3430 · L3830 · L4630 · L5030, 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 it with a saw
blade and chamfer the segment edges.
Factory spec.
Commutator O.D.
Allowable limit
Factory spec.
Difference of O.D.'s
Allowable limit
Factory spec.
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 spec.
Brush length A
Allowable limit
Brush Holder
1. Check the continuity across the brush holder and the holder
support with an ohmmeter.
2. If there is continuity, replace the brush holder.
Brush holder –
Resistance
Holder support
9-S42
ELECTRICAL SYSTEM
30.0 mm
1.181 in.
29.0 mm
1.142 in.
Less than 0.02 mm
0.0008 in.
0.05 mm
0.0020 in.
0.50 to 0.80 mm
0.0197 to 0.0315 in.
0.20 mm
0.0079 in.
(a) Correct
(b) Incorrect
W10170920
15.0 mm
0.591 in.
11.0 mm
0.433 in.
W10175440
Infinity
W10176720
KiSC issued 02, 2007 A