Removal And Replacement Of Components And Component Assemblies; Extracting And Inserting The Rotor; Changing Bearing; Changing Rotating Diodes - Sincro FB Serie Manuel D'instruction Et De Maintenance

7.4 Removal and replacement of components
and component assemblies

7.4.1 Extracting and inserting the rotor

The following procedures presume the alternator has been
separated from the engine.
Dual bearing (B3 B14), cone version and SAE single
bearing version.
• Remove the tap and hammer the back of the rotor, (for B3
B14 version, unscrew the four M10 nuts that fasten the
flange to alternator) so that the bearing comes free.
• Lift the rotor with a belt on the coupling side.
• Continue to drive the rotor out of the stator, gradually
adapting the sling so that the winding is not damaged.
Insert the rotor following in reverse the instructions at section
7.4.1.
When the rotor is repositioned, the alternator may loose
the residual magnetism that enables it to self-excite. Before
restart of the generating set the alternator will therefore
have to be excited by applying a 6-12 volt current across
the exciter terminals for a second, respecting the polarities
(while engine running).

7.4.2 Changing bearing

See section 7.4.1
• Remove the seeger ring (R).
• Remove the bearing or bearings (B) using a standard
extractor.
• Take the new bearing or bearings and heat them (max.
100 ÷ 110°C) so their diameter dilates before sliding them
into position on the shaft.
• Replace the seeger ring (R).
• Insert the rotor by following in reverse the instructions at
section 7.4.1.

7.4.3 Changing rotating diodes

• Extract the rotor following the instructions at section
7.4.1
• Remove the seeger ring.
• Remove the bearing or bearings using a standard extractor.
• With a solder disconnect the five cables (S) of the rotating
rectifier bridge
• Unscrew the three screws (V) and remove the diode
bridge.
• Fit the new rectifier bridge, by fixing the three screws and
soldering the five cables to the rotating rectifier bridge.
Taking care to connect the positive and the negative cables
on the right position.
• Replace the rotor following in reverse the instructions given
at section 7.4.1
7.4.4 Replacing components and component
assemblies
When assembling after changing a part repeat the above
operations in reverse.
R
ENGLISH
B
27