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2018.01 / g
16
Electric Power Generation
Installation and maintenance
LSA 44.3
Low Voltage Alternators - 4 pole
5056 en -
Rotor
NDE shield
Screw rod
When dismantling the shields, you will
need to change the antifriction bearings,
the “O” ring seal, the preloading (wavy)
washer and adhesive paste.
• Replacing the DE bearing
- Dismantling
- Uncouple the alternator from the prime
mover.
- Remove the 8 assembly screws.
- Remove the DE shield [32].
- Remove the NDE shield.
- Remove both antifriction bearings [60] and
[70] using a puller with a central screw.
- Reassembly
- Heat the new bearings by induction or in a
drying oven at 80°C (do not use an oil-bath)
and fit them to the machine.
- Check that both the preloading wavy washer
[79] and the new O ring seal [349] have been
fitted on the NDE shield [36].
Refit the NDE shield and pass the bundle of
wires between the top bars of the shield.
- Refit the DE shield [32] and tighten the
8 fixing screws.
- Check that the alternator assembly is
correctly mounted and that all screws are
tightened.
• Accessing the main field and stator
- Dismantling
Follow the procedure for dismantling the
bearings.
- Remove the coupling disc (single-bearing
alternator) or the DE shield (twin-bearing
alternator) and insert a tube of the
corresponding diameter on the shaft end.
- Rest the rotor on one of its poles, then slide
it out. Use the tube as a lever arm to assist
dismantling.
- After extraction of the rotor, be careful not
to damage the fan or dismantle it.
- Remove the revolving field coil (rotor) and
place on special V-shaped supports.
NOTE: If intervention is required on the
revolving
field
coil
(rewinding,
replacement of components), the rotor
assembly must be rebalanced.
- Reassembling the revolving field coil
- Follow the dismantling procedure in reverse
order.
Take care not to knock the windings when
refitting the rotor in the stator.
- Refit the fan with its fixing screws on the
hub.
Follow the procedure for refitting the
bearings.
WARNING