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Figure 6-44
4. Allow the hub to cool for one hour. After
the hub has cooled, tighten the set screws in
the hub to 50 ft-lbs. (68 N.M.) torque. Match
the alignment marks on the fan and hub and
mount the fan. (See item B.)
5. Rebalancing the rotor assembly is not
necessary if only the hub is replaced and the
fan is mounted in the same location relative
to the hub and shaft.
MAIN ROTOR CORE AND WINDINGS
1. Clean all parts. Remove dust and dirt
from the rotor winding air passages with
low-pressure, moisture-free air.
Figure 6-45
2. Check the rotor for loose, frayed, or
burned windings. Measure winding
resistance an insulation resistance. Test for
shorted turns using an A-C impedance test A
defective rotor winding must be rewound
The rotor assembly must be rebalanced after
any rework or repair has been completed.
DRIVE DISCS (SINGLE BEARING
GENERATORS ONLY)
1. Inspect the drive discs for distorted or
bent edges. (Figure 6-46) Inspect for worn
mounting holes. Replace all defective discs
as necessary.
Figure 6-46
2. Inspect the drive disc mounting cap
screws for damaged threads. Replace cap
screws if damaged.
FRONT (EXCITER) END
BRACKET INSPECTION
1. Remove the filler and drain grease pipes
and the grease plugs from outer bearing cap.
(Figure 6-47.)
Figure 6-47
40
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