Specifications

12
INSTALLATION AND MAINTENANCE
LSA 50.1 / LSA 51.2
ALTERNATORS
SERVICING - MAINTENANCE
Réf. 3281 en - 10.2007 / g
LEROY-SOMER
4.6.6 - Replacing the DE bearing on two-
bearing machines
- Remove the 6 screws (411) and 4 screws (62).
- Tap off the DE shield (410) from the stator (1.)
- Extract the ball bearing (60) with a puller.
- Fit the new bearing, after heating it by induction system to
80°C maximum.
WHEN DISMANTLING THE MACHINE, ALWAYS CHANGE
THE BEARINGS.
4.6.7 - Complete dismantling
- Remove the 6 screws (411).
- Support the DE rotor (4) with a strap.
- Remove the NDE shield (36) (section 4.6.5).
- Support the rotor with a tube on the NDE shaft extension.
- Push the rotor out of the stator, with care.
- If necessary, dismantle the coupling system and the DE
shield (410).
4.6.8 - Reassembling the bearings
- Place the "O" ring seal (349) and the preloading wavy
washer (79) in the bearing seat (36).
- Fit the NDE shield (36) and the DE shield (410) on the stator
(1).
- Tighten the 12 screws of the shield on the stator.
- Fit the inner bearing retainer with appropriate lubrication (68
and 78).
- Tighten the 4 screws on the bearing retainer (68 and 78).
- Refit and connect the diode bridge (section 4.6.5).
- Refit the air intake grille (47).
4.6.9 - Reassembling the rotor
See sections 4.6.7 and 4.6.8
If the rotor has been fully rewound, it must be
rebalanced.
After operational testing, replace all access panels or
covers.
4.7 - Installation and maintenance of
the PMG
The PMG reference for the 50.1/51.2 is PMG 4
4.7.1 - Mechanical characteristics and
assembly
The assembly consists of :
- an adaptation shaft (position the PMG on the alternator shaft
extension) (291)
- an M20 tie rod, with a cable gland washer and nut for
assembling the rotor (295 and 296)
- a rotor with 16 magnets (292)
- the stator assembly with leads (293)
- the PMG housing (290)
4.7.2 - Assembling the PMG
- Remove the air intake grille (47).
- Mount the rotor on the adaptation shaft.
- Mount the rotor assembly on the shaft (4) with the tie rod and
tighten the M20 nut.
- Mount the stator in the PMG housing and tighten the screws.
- Fit the stator assembly on the NDE shield (36).
- Tighten the PMG screws on the NDE shield.
- Connect the stator leads on the PMG.
- Fit the spacer for the air intake grille.
- Finally, fit the air intake grille (47).
Note : Check the air gap on the PMG.
Note : Ideally, the PMG should be fitted on a machine which
68
62
60
410
40
Ø120 Ø130 Ø230
LSA 50.1
68
62
60
30
48
Ø150 Ø160 Ø290
LSA 51.2
WARNINGWARNING
WARNING
WARNING
293
292
291
295
296
290
299
298