14
2020.05 / c
Electric Power Generation
Installation and maintenance
LSAH 44.3
Low Voltage Alternator - 4 pole
5577 en -
- To facilitate mounting, screw two threaded
rods into inner bearing retainer [78] and
slide them into the holes of the shield [36] by
reassembling the non drive end shield [36].
- Finish the assembly of inner bearing
retainer [78], unscrew the threaded rod,
replace it with the 2 bolts [78] and the 4 bolts
[36], and lock them.
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
- Remove the 2 fixing bolts [68].
- Remove the 8 fixing bolts [30].
- Remove the DE shield [30] using a puller:
eg. U.32 - 350 (FACOM).
- Remove the antifriction bearing [60] using
a screw puller.
- 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 machine.
- To facilitate mounting, screw two threaded
rods into inner bearing retainer [78] and
slide them into the holes of the shield [30] by
reassembling the drive end shield [30].
- Finish the assembly of inner bearing
retainer [78], unscrew the threaded rod,
replace it with the 2 bolts [68] and the 8 bolts
[30], and lock them.
• Accessing the main field and stator
- Dismantling
Follow the procedure for dismantling the
bearings.
- 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, replace-
ment 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 bolts on the hub.
Follow the procedure for refitting the
bearings.
WARNING
