SDMO R33C3 User And Maintenance Manual page 210

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 fit it to the
alternator.
- Place the preloading wavy washer [79] in the flange and fit 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 flange [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 fitted [349] on the NDE bracket [36].
- Replace the DE flange [30], and tighten the 8 fixing screws.
- Check that the whole alternator is correctly assembled and
that all screws are fully tightened.
4.6.7 - Accessing the main field 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 flange (two-bearing alternator) and insert a tube of the
corresponding diameter on the shaft end or a support made
according the following bellow.
14
InstallatIon and maIntenance
LSA 42.2 - 2 & 4 POLE
ALTERNATORS
208/242
- 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 field
(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 refitting 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 final adjustments, the access panels or cover
should be refitted.
3433 en - 2010.10 / g