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7 DISASSEMBLY AND ASSEMBLY OF THE ALTERNATOR
All the repair, disassembly and assembly services must be performed by properly qualified and trained professionals only.
The sequence for the disassembly and assembly depends on the model of the alternator.
7.1 DISASSEMBLY
Below are some recommendations that must be
observed when disassembling an alternator:
1. Always use proper tools and devices to disassemble
the alternator;
2. Before disassembling the alternator, disconnect the
water cooling and lubrication tubing (if applicable);
3. Disconnect the electric connections and accessories;
4. Remove the heat exchanger and noise suppressor (if
applicable);
5. Remove the bearing temperature sensors and
grounding brush;
6. In order to prevent damages to the rotor, provide a
support for supporting the shaft in the drive and non-
drive ends;
7. For disassembling the bearings, follow the
procedures described in this manual;
8. The removal of the rotor from inside the alternator
must be done with a suitable device and with extreme
care so that the rotor does not drag on the stator
lamination core or coil heads, preventing damages.
7.2 ASSEMBLY
Below are some cautions that must be taken when
assembling an electric alternator:
1. Always use proper tools and devices for assembling
the alternator;
2. For assembling the alternator, follow the disassembly
procedures in the reverse order;
It is recommended that any damaged part (cracks, dents
on the machined parts, damaged threads) be replaced,
avoiding repairing the parts.
7.3 SPARE PARTS
WEG recommends keeping in stock the following spare
parts:
DE bearing;
NDE bearing;
Temperature sensor for DE bearing;
Temperature sensor for NDE bearing;
Space heater;
Felt for filter (if applicable);
Diode set
Varistor
Voltage regulator
Shaft grounding brush
The spare parts must be stored in a clean, dry and well
ventilated environment, if possible, at constant
temperature.
7.4
TIGHTENING TORQUES
Table 7.1 shows the tightening torques of the screws
recommended for assembling the alternator or its parts:
Table 7.1: Tightening torques of the screws
Material /
Carbon steel /
Resistance
8.8 or above
class
Metal
Type of
/
fastening
Metal
% Yield
60%
strength
Pitch
Diam.
Tightening torque of the screws (Nm)
(mm)
M3
0.5
0.9
M4
0.7
2.1
M5
0.8
4.2
M6
1
8
M8
1.25
19.5
M10
1.5
40
M12
1.75
68
M14
2
108
M16
2
168
M18
2.5
240
M20
2.5
340
M22
2.5
470
M24
3
590
M27
3
940
M30
3.5
1170
M33
3.5
1730
M36
4
2060
M42
4.5
3300
M48
5
5400
NOTE
The resistance class is usually indicated on the
head of the hex screws.
7.5 GENERAL RECOMMENDATIONS
ATTENTION
All services described herein must be carried
out by qualified and experienced persons,
otherwise, damages to property or personal
injuries may occur.
If any further explanations are necessary,
contact WEG.
Installation, operation and maintenance manual
www.weg.net
Stainless steel /
A2 – 70 or above
Metal
Metal /
Metal /
/
Insulation
Insulation
Metal
33%
70%
33%
0.5
0.75
0.4
1
1.8
2
3.6
1.7
4.4
6.2
3.4
10.7
15
8.3
21
30
16.5
37
52
28
60
84
46
92
130
72
132
180
100
187
255
140
260
350
190
330
440
240
510
700
390
640
880
480
950
1300
710
1130
1540
840
1800
2470
1360
2970
4050
2230
|
1
33
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