SDMO R33C3 - Page 210

14
INSTALLATION AND MAINTENANCE
LSA 42.2 - 2 & 4 POLE
ALTERNATORS
3433 en - 2010.10 / g
LEROY-SOMER
4.6.5 - Replacing the NDE bearing on a single-
bearing alternator
4.6.5.1 - Dismantling
- Dismantle the NDE bracket [36] (see section 4.6.2.1).
- Remove the bearing [70] using a puller.
4.6.5.2 - Reassembly
- Heat the inner slipring of a new bearing by induction or in a
drying oven at 80 °C (do not use an oil bath) and t it to the
alternator.
- Place the preloading wavy washer [79] in the ange and t a
new O ring seal [349].
- Replace the NDE bracket [36] (see section 4.6.2.2).
4.6.6 - Replacing the bearings on a two-bearing
alternator
4.6.6.1 - Dismantling
- Uncouple the alternator from the prime mover.
- Remove the 8 assembly screws.
- Remove the DE ange [30].
- Remove the NDE bracket (see section 4.6.2.1).
- Remove both bearings [60] and [70] using a puller.
4.6.6.2 - Reassembly
- Fit new bearings after heating them by induction or in a drying
oven at 80 °C (do not use an oil bath).
- Check that both the preloading wavy washer [79] and new O
ring seal have been tted [349] on the NDE bracket [36].
- Replace the DE ange [30], and tighten the 8 xing screws.
- Check that the whole alternator is correctly assembled and
that all screws are fully tightened.
4.6.7 - Accessing the main eld and stator
4.6.7.1 - Dismantling
Follow the procedure for dismantling bearings (see
sections 4.6.5.1 and 4.6.5.1.)
- Remove the coupling discs (single-bearing alternator) or the
DE ange (two-bearing alternator) and insert a tube of the
corresponding diameter on the shaft end or a support made
according the following bellow.
- Rest the rotor on one of its poles, then slide it out. Use the tube
as a lever arm to assist dismantling.
- After extraction, be careful with the fan. It is necessary to
replace the fan in case of disassembling.
NOTE: If intervention is required on the main eld
(rewinding, replacement of components), the rotor
assembly must be rebalanced.
Do not use the fan to turn the alternator rotor
4.6.7.2 - Reassembly
- Follow the dismantling procedure in reverse order.
Take care not to knock the windings when retting the rotor in
the stator.
If you replace the fan, respect the assembly guide according
the following bellow. Use a tube and a screw.
Follow the procedure for reassembling the bearings (see
section 4.6.5.2 and 4.6.6.2).
After nal adjustments, the access panels or cover
should be retted.
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