Alternator - wsm STW37 Workshop Manual

STW34, STW37, STW40, WSM

(2) Alternator

Bearing
1. Check the bearing for smooth rotation.
2. If it does not rotate smoothly, replace it.
Stator
1. Measure the resistance across each lead of the stator coil with
an ohmmeter.
2. If the measurement is not within factory specification, replace it.
3. Check the continuity across each stator coil lead and core with
an ohmmeter.
4. If the measurement is not within the factory specifications,
replace it.
Resistance Factory specification
Rotor
1. Measure the resistance across the slip rings with an ohmmeter.
2. If the resistance is not the factory specification, replace it.
3. Check the continuity across the slip ring and core with an
ohmmeter.
4. If the measurement is not within the factory specifications,
replace it.
Resistance Factory specification
Slip Ring
1. Check the slip ring for score.
2. If scored, correct with an emery paper or on a lathe.
3. Measure the O.D. of slip ring with vernier calipers.
4. If the measurement is less than the allowable limit, replace it.
Factory specification
Slip ring O.D.
Allowable limit
Brush Wear
1. Measure the brush length with vernier calipers.
2. If the measurement is less than allowable limit, replace it.
3. Make sure that the brush moves smoothly.
4. If the brush is damaged, replace it.
Factory specification
Brush length
Allowable limit
9-S47
ELECTRICAL SYSTEM
WSM000001ELS0039US0
Less than 1.0 Ω
WSM000001ELS0040US0
2.9 Ω
WSM000001ELS0041US0
14.4 mm
0.567 in.
14.0 mm
0.551 in.
WSM000001ELS0042US0
10.5 mm
0.413 in.
8.4 mm
0.331 in.
WSM000001ELS0043US0
KiSC issued 11, 2014 A