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 TM 55-1905-223-24-3
d. Inspect the generator main stator.
(1) Check for loose, frayed, or burned windings.
(2) Inspect the mating surfaces of the stator/frame for cracks and burrs.
(3) If any damage is found, replace the main stator/frame or the generator assembly.
e. Inspect the generator fan at the drive end of the main rotor assembly.
CAUTION
The entire rotor assembly must be balanced when a new fan is installed. For this
reason, install a new rotor assembly if the fan is damaged.
(1) Check the fan for cracks, broken blades, or distortion.
(2) If the fan is damaged, replace the main rotor with a new balanced rotor assembly.
f. If the generator bearing has been removed for any reason, always install a new bearing.
g. Varistor replacement. The varistor may be replaced without removing the generator assembly. Use
the following procedure:
(1) Shut down the generator and turn off and tag all starting circuits.
(2) Remove the end covers (3, Figure 3-3) for access to the rectifier assembly.
(3) Disconnect the terminal lead and remove the varistor (5, Figure 4-4).
(4) Install the new varistor and tighten nut to 36-42 in-lb (4.8 N m) torque. Connect the terminal lead.
h. Insulation resistance measurements.
NOTE
If a generator has been in storage for over 6 months or has been exposed to high humidity or
temperature changes that could cause condensation, check the insulation resistance before putting
the unit into service.
The insulation resistance of the main stator winding is the most important value. The insulation
resistance of the main stator and the permanent magnet stator are easy to measure.
4-12
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