Sincro HB 2 Manual Para El Uso Y Mantenimiento página 26

ENGLISH
Caution!
Before extracting the rotor turn it so that
during extraction the rotor rests on the
pole shoe while inside the stator.
When the rotor is repositioned, the alter-
nator may loose the residual magnetism
that enables it to self-excite. Before start-
ing up the generating set the alternator will
WARNING!
therefore have to be excited by applying a 6-
12 volt current across the exciter terminals
for a second, respecting the polarities.
26 - HB - Maggio 2004 - Rev. 00
7.4 Removal and replacement of components and component as-
semblies
7.4.1 Extracting and inserting the shaft
The following procedures presume the alternator has been sepa-
rated from the motor.
Dual bearing and cone version
• Unscrew the 4 M10 nuts that fasten the shield to the spacer flange.
• Hammer the shield evenly until it comes away from the rotor (dual
bearing version) and from the spacer flange (cone version).
• Remove the back grille and hammer the back of the rotor, so that the
bearing comes free.
• Sustain the rotor with a sling on the coupling side.
• Continue to drive the rotor out of the stator, gradually adapting the
sling so that the winding is not damaged.
SAE single bearing version
• Remove the back grille and hit the back of the rotor so that the bearing
comes free.
• Sustain the rotor with a sling 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 shaft following in reverse the instructions at section
7.4.1.
Caution: Before extracting the rotor turn it so that during extraction
the rotor rests on the pole shoe while inside the stator.
Warning! When the rotor is repositioned, the alternator may loose
the residual magnetism that enables it to self-excite. Before start-
ing up 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.
7.4.2 Changing bearing
See section 7.4.1
• Remove the snap ring.
• Remove the bearing or bearings using a standard extractor.
• Take the new bearing or bearings and heat them so their diameter dilates
before sliding them into position on the shaft.
• Replace the snap ring
• Insert the rotor by following in reverse the instructions at section 7.4.1.
As an alternative the bearing can be changed without extracting the
rotor:
• Unscrew the 4 bolts that fasten the back shield to the housing.
• Hammer the shield evenly until it comes away from the rotor.
• Remove the snap ring.
• Remove the bearing or bearings using a standard extractor.
• Take the new bearing or bearings and heat them so their diameter dilates
before sliding them into position on the shaft.
• Replace the snap ring.
• Position the shield remembering to insert the snap ring and fit the screws
leaving them loose.
• Hammer the shield evenly until the bearing and section of housing are in
place.
• Tighten the bolts on the shield.
7.4.3 Changing rotating diodes
• Extract the rotor following the instructions at section 7.4.1