Nanni N4.40, Workshop Manual

Page: 173 / 175

ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S103
Stator
1. Measure the resistance across each lead of the stator coil with
the resistance range of circuit tester.
2. If the measurement is not in the factory specification, replace
the stator assembly.
3. Examine the continuity across each stator coil lead and core
with the resistance range of circuit tester.
4. If it does not show infinity, replace the stator assembly.
M00000003ENS0154US1
Rotor
1. Measure the resistance across the slip rings.
2. If the resistance is not in the factory specification, replace the
rotor assembly.
3. Examine the continuity across the slip ring and core with the
resistance range of circuit tester.
4. If it does not show infinity, replace the rotor assembly.
M00000003ENS0155US1
Slip Ring
1. Examine the slip ring for score.
2. If there is score, correct with an emery paper or on a lathe.
3. Measure the O.D. of the slip ring with a vernier calipers.
4. If the measurement is less than the allowable limit, replace the
rotor assembly.
M00000003ENS0156US1
Brush Wear
1. Measure the brush length with a vernier calipers.
2. If the measurement is less than the allowable limit, replace it.
3. Make sure that the brush moves smoothly.
4. If the brush is defective, replace it.
M00000003ENS0157US1
Resistance Factory spec. Less than 1.0 Ω
Resistance Factory spec. 2.9 Ω
Slip ring O.D.
Factory spec.
14.4 mm
0.567 in.
Allowable limit
14.0 mm
0.551 in.
Brush length
Factory spec.
10.5 mm
0.413 in.
Allowable limit
8.4 mm
0.33 in.
KiSC issued 06, 2009 A