15
INSTALLATION AND MAINTENANCE
LSA R 49.1 Air/air heat exchanger
ALTERNATORS - Ex II 3 G
SERVICING - MAINTENANCE
4081 en - 09.2006 / a
LEROY-SOMER
4.6 - Dismantling, reassembly
During the warranty period, this operation should only be
carried out in an approved workshop or in our factory,
otherwise the warranty may be invalidated.
Whilst being handled, the machine should remain
horizontal.
4.6.1 - Tools required
To fully dismantle the machine, we recommend using the
tools listed below :
- 1 ratchet s extension
- 1 torque wrench
- 1 set of flat spanners : 9 mm, 10 mm, 18 mm
- 1 socket set : 10, 13, 17, 18, 19, 24 mm,
- 1 puller (U35) / (U32/350)
- 1 hexagonal wrench 6 mm - 10 mm.
4.6.2 - Screw tightening torque
4.6.3 - Dismantling - Reassembly
4.6.3.1 - Access to diodes
- Remove the diode access door (140).
- Disconnect the diodes.
- Check 12 diodes using an ohmmeter or a battery lamp (see
section 5 - 4).
If the diodes are faulty :
- Remove the surge suppressor (347).
- Remove the 6 "H" mounting nuts for the diode assembly on
the support.
- Change the fitted caps, respecting the polarity.
4.6.4 - Access to connections and the
regulation system
Access is easy after the hood has been removed (132).
4.6.5 - Replacing the NDE bearing
- Remove the terminal block cover (132).
- Unplug (+ et -) field system.
- If bearing probe, unplug at the terminal, break the network
circlips up to the bearing.
- Dismantle the air intake grid (50).
- Dismantle the air turbine (118).
- Dismantle the air turbine cover (117).
- Remove the V-Ring gasket (249).
- Remove the inner hood bearing screws (78).
- Remove the rear flange (82).
- Remove the ball bearing (70) using a puller with a central
screw (see fig. below).
- Change the "O" ring (349).
- Fit the new bearing, after heating it by induction at
approximately 80°C.
REPLACE THE DISMANTLED BEARING WITH A NEW
ONE.
4.6.6 - Replacing the DE bearing
- If bearing probe, unplug at the terminal, break the network
clips up to the bearing.
- Remove the V-Ring gasket (247).
- Remove the inner hood bearing screws (68).
- Remove the rear flange (410).
- Take out the circlips (284).
- Remove the ball bearing (60) using a puller with a central
screw.
- Fit the new bearing, after heating it by induction at
approximately 80°C.
REPLACE THE DISMANTLED BEARING WITH A NEW
ONE.
4.6.7 - Complete dismantling
- Take out the NDE bearing following the instructions in
section 4.6.5.
- Take out the DE bearing following the instructions in section
4.6.6.
- Remove the access plates (140).
- Remove the lubricating tubes (77).
- Dismantle the mill tube case (116).
- Dismantle the front bush (30).
- Support the rotor (4) on the interconnection side using a belt
or a bracket.
- Using a mallet gently hit the end of the shaft on the opposite
side of the interconnection.
- As the rotor moves adjust the belt to compensate for shift in
weight.
IDENTIFICATION
screw Ø
Torque N.m
Exciter screw
M6
8,3
Diode / Star bridge
M 6
10
Diode nut
M 6
3
DE shield / frame screw
M 12
70
NDE shield / frame screw
M 12
70
Bush / casing
M 12
70
Earth screw
M 12
35
Grille screws
M 6
4
Cover screws
M 6
5
Stator connection nut
M 12
35
WARNING
WARNING
WARNING
WARNING