1J
Generator Inspection
Rotor
1) Using an ohmmeter, check for continuity between slip rings of rotor. If there is no continuity, replace the rotor.
Standard resistance between slip rings of rotor
2.7 – 3.1 Ω at 20 °C (68 °F)
2) Using ohmmeter, check that there is no continuity between slip ring and rotor core. If there is continuity, replace rotor.
3) Check slip rings for roughness or scoring. If rough or scored, replace rotor.
4) Check slip rings for roughness or scoring. If rough or scored, replace rotor. Using a vernier caliper, measure the slip ring diameter. If the diameter is less than minimum, replace the rotor.
Slip ring diameter
Standard: 14.2 – 14.4 mm (0.560 – 0.566 in.)
Limit: 12.8 mm (0.503 in.)
Stator
1) Using ohmmeter, check all leads for continuity.
If there is no continuity, replace stator.
2) Using ohmmeter, check that there is no continuity between coil leads and stator core.
If there is continuity, replace stator.
Brush and Brush Holder
Check each brush for wear by measuring its length. If the brush is found worn down to service limit, replace the brush.
Exposed brush length “a”
Standard: 10.5 mm (0.41 in.)
Limit: 1.5 mm (0.05 in.)
Rectifier
1) Using an ohmmeter, connect one tester probe to the “B” terminal (1) and the other to each rectifier terminal (2).
2) Reverse the polarity of the tester probes and repeat step 1).
3) Check that one shows continuity and the other shows no continuity.
If there is continuity, replace the rectifier.
4) Using an ohmmeter, connect one tester probe to each negative terminal (1) and the other to each rectifier terminal (2).
5) Reverse the polarity of the tester probes and repeat step 4).
6) Check that one shows continuity and the other shows no continuity.
If there is continuity, replace the rectifier.
Drive End Bearing
Check that the bearing is not rough or worn.
End Housing Bearing
Check that the bearing is not rough or worn.
When removal is necessary, use bearing puller to remove end housing bearing (1).
CAUTION:
Be careful not to distort cooling fan blade while applying puller.