Service manual

9-2013 4. Service
4.8 Alternator Temperature Switch
The alternator temperature switch contacts are normally closed. The switch contacts open at
170 °F ± 5°.
4.9 Brush Block/Slip Ring Service
Disconnect the field leads from the brush block (F1, F2), remove the two mounting screw and
withdraw the brush block from the generator end bell. Replace the brush block assembly if
either brush is shorter than 7/16 inch (11 mm), binds in the brush block or is damaged in any
way.
Remove the brush block and inspect the slip rings for grooves, pits, or other damage. Use a
Scotch Brite pad or commutator stone to remove light wear or corrosion.
4.10 Stator Service
Removal:
1. Remove roof, service doors, finger guards and panels as necessary.
NOTICE
The back panel must be removed to remove the stator.
2. Remove the engine-generator assembly.
3. Remove the brush block.
CAUTION
The brushes can be damaged if the brush block is not removed before removing the end
bell.
4. Remove the nuts and lock washers on the four stator through studs.
5. Remove the end bell.
6. Pull the stator straight out and away from the engine, leaving the rotor and through studs in
place, taking care not to damage rotor or stator windings.
Reassembly: Reassembly is the reverse of removal. Re-lubricate the bearing bore in the end
bell with molybdenum disulfide paste or equivalent and make sure the O-ring is placed in the
bearing bore. Torque the nuts on the through studs to 31 ft-lbs (42 N-m).
4.11 Rotor Service
Removal:
1. Remove roof, service doors, finger guards and panels as necessary.
NOTICE
The back panel must be removed to remove the rotor.
A030A239 (Issue 10) 35