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 TM 55-1905-223-24-3
CAUTION
When installing the bearing in the cartridge, press the OUTER race only, to
avoid damage to the bearing.
(1) Press the new bearing into the bearing cartridge using an arbor press (Figure 4-6a).
(2) Use insulated gloves. Install the bearing on the shaft. Quickly push the bearing on the shaft until it seats against
the shaft shoulder. The bearing should slide on the shaft and be seated without excessive force (Figure 4-6b).
CAUTION
Applying pressure to the outer bearing race can damage the bearing.
(3) If the bearing binds on the shaft before being fully seated, use a length of pipe with an inside diameter slightly
larger than the shaft to drive the bearing against the shaft seat. Apply pressure to the inner race of the bearing
only (Figure 4-6c).
(4) Install the large snap ring on the generator shaft next to the inner race of the bearing. Make sure that the snap
ring is seated in the grove (Figure 4-3c).
(5) Install the bearing cap (Figure 4-3b and 4-3a).
c. Install the generator main rotor assembly.
(1) Put a sling around the main generator rotor at the approximate center balance point. The best location for the
sling is where only a slight downward force on the fan is required to balance the assembly (Figure 4-2g).
(2) Position the rotor into the stator as far as the sling will allow. Use care to avoid bumping the main exciter rotor
into the main generator stator (Figure 4-2f).
NOTE
This operation will be easier with a second person supporting and guiding the non-drive end of the
shaft.
CAUTION
Do not wrap the sling around the rotor winding end turns. A sling can damage the rotor winding end
turn insulation.
(3) Lower the support and re-position the sling closer to the fan. Lift the rotor and continue installation until the sling
can no longer be used (Figure 4-2e).
4-22
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