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Figure 6-38
3.Be sure the inner bearing cap is on the
shaft before installing the new bearing.
4. Heat the new bearing in an oven to a
maximum temperature of 212°F (100°C).
Apply a thin coat of clean lubricating oil to
the press-fit area of rotor shaft. Install the
bearing over the end of the shaft until it
seats against the shaft shoulder as shown in
Figure 6-39. The bearing should slide on the
shaft and seated without excessive force. If
the bearing binds on the shaft before being
fully seated a piece of tubing, slightly larger
than the press area, can be used to drive the
bearing into place. Using light taps with a
soft mallet, apply pressure to the inner race
only.
CAUTION:
UNDER NO CIRCUMSTANCES SHOULD
PRESSURE BE APPLI ED TO THE OUTER
RACE OF THE BEARING, AS
PERMANENT BEARING DAMAGE
COULD RESULT.
Figure 6-39
Allow the bearing to cool for one
hour before attempting to assemble the
generator.
FAN
1. Check the fan for cracks or broken blades.
Replace the fan if defective.
2. Mark the hub and fan for alignment, this
is necessary to be sure the balance weights
will be in the same position when the fan is
reinstalled.
3. For single bearing generators. Remove the
fan mounting cap screws (Figure 6-40) and
slide the fan off the shaft. (Figure 6-41.)
For two-bearing generators, remove the
drive end bearing and bearing cap. (See
bearing removal instructions.) Remove the
fan mounting cap screws and slide fan off
the shaft. (Figure 6-40 and 6-41.)
38
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