SDMO R44C3 - Page 183

13
2010.10 / i
LeRoY-SoMeR
4.6.1 - Tools required
To fully dismantle the machine, we recommend using the tools
listed below:
- 1 ratchet spanner + extension
- 1 torque wrench
- 1 set of at spanners: 7 mm, 8 mm, 10 mm, 12 mm
- 1 socket set: 8 mm, 10 mm, 13 mm, 16 mm, 18 mm, 21 mm,
22 mm, 24 mm
- 1 size 5 Allen key (eg. Facom: ET5)
- 1 size 6 Allen key (eg. Facom: ET6)
- 1 size 10 Allen key (eg. Facom: ET10)
- 1 size 14 Allen key (eg. Facom: ET14)
- 1 T20 and T30 TORX bit
- 1 puller (eg. Facom: U35)
- 1 puller (eg. Facom: U32/350).
4.6.2 - Screw tightening torque
IDENTIFICATION screw Ø Torque N.m
Field terminal block screw M4 4 N.m
Field screw M6 10 N.m
Diode bridge/RP M6 5 N.m
Diode nut M5 4 N.m
43.2 tie rod M12 57 N.m
44.2 tie rod M14 90 N.m
Earth screw M8 26 N.m
43.2 disc/shaft screw M12 110 N.m
44.2 disc/shaft screw M16 250 N.m
44.2 turbine screw M6 5 N.m
Grille screws M6 5 N.m
Cover screws M6 5 N.m
Terminal block nut M10 20 N.m
4.6.3 - Access to connections and the
regulation system
The terminals are accessed directly by removing the terminal
box lid [48].
To access the AVR adjustment potentiometers, the side plate
[367] should be removed.
4.6.4 - Accessing, checking and
replacing diodes
4.6.4.1 - Dismantling
- Remove the air intake grille [51]
- Remove the surge suppressor [347]
- Disconnect the 6 diodes using an ohmmeter or a battery lamp
(see section 4.5.2)
4.6.4.2 - Reassembly
- Replace the bridges, respecting the polarity (see section 4.5.1)
- Replace the surge suppressor [347]
- Ret the air intake grille [51]
- Replace the terminal box lid [48]
4.6.5 - Replacing the NDE bearing on single-
bearing machines
4.6.5.1 - Dismantling
- Remove the terminal box lid [48]
- Remove the air intake grille [51]
- Unscrew the xing clamps on the power output cables,
remove the connector from the exciter and the R 791 module.
- Remove the 4 nuts on the tie rods
- Remove the NDE shield [36] using a puller: eg. U.32 - 350
(FACOM)
- Remove the ball bearing [70] using a screw 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
machine.
- Place the preloading wavy washer [79] in the shield and t a
new O ring seal [349].
Ret the NDE shield and pass the bundle of wires between the
top bars of the shield.
- Ret the xing clamps on the cables, the R 791 module and
the exciter connector.
- Ret the air intake grille [51].
- Replace the terminal box lid [48].
NDE shield
Rotor
Screw rod
4.6.6 - Replacing the bearings on two-bearing
machines
4.6.6.1 - Dismantling
- Uncouple the alternator from the prime mover.
- Remove the 8 assembly screws.
- Remove the DE shield [30].
- Remove the NDE shield (see section 4.6.5.1)
- Remove both ball bearings [60] and [70] using a puller with a
central screw.
4.6.6.2 - Reassembly
- Heat the new bearings by induction or in a drying oven at 80°C
(do not use an oil-bath) and t them to the machine.
- Check that both the preloading wavy washer [79] and the new
O ring seal [349] have been tted on the NDE shield [36].
Ret the NDE shield and pass the bundle of wires between the
top bars of the shield.
- Ret the DE shield [30] and tighten the 4 xing screws.
- Check that the machine assembly is correctly mounted and
that all screws are tightened.
INSTALLATION AND MAINTENANCE
LSA 43.2 / 44.2 - 4-poLe
ALTeRNAToRS
3434 en -
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