Removal And Replacement Of Components And Component Assemblies; Removal And Re-Assembly Of Pmg; Extracting And Inserting The Rotor; Changing The Bearing - Sincro SK 400 Manuale Di Uso E Manutenzione

ENGLISH
7.2 Removal and replacement of components and
component assemblies

7.2.1 Removal and re-assembly of PMG

• Remove generator end-shield cover;
• Disconnect the connector of the PMG;
• Unscrew the four screws that hold the PMG stator on
generator end-shield;
• Pull the stator out of the rotor (take care due to the strong
magnetic force that can attract the stator and cause
destruction of the stator windings or even cause operator
injury).
• Unscrew the three screws that holds PMG rotor to the
main generator rotor.
For reassembling perform PMG repeat the above procedure
in reverse. Take care that before assembling the stator PMG,
the rotor PMG is cleaned of metal particles.

7.2.2 Extracting and inserting the rotor

The following procedures presume the alternator has been
separated from the engine.
Before extracting the rotor turn it so that
during extraction the rotor rests on the pole
shoe while inside the stator.
CAUTION!
Dual bearing version
• Remove the PMG from the non-drive end of the generator
following procedure described in 7.2.1.
• Unscrew the 8 M16 screws that fasten the shield to the
housing.
• Hammer the shield evenly until it comes away from the
rotor.
• Remove the back grids and hammer the back of the rotor,
so that the bearing comes free.
• Sustain 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.
SAE single bearing version
• Remove the PMG from the non-drive end of the generator
following procedure described in 7.2.1.
• Unscrew the 8 M16 screws that fasten the shield to the
fl ange (for the SAE 1 version this is not necessary).
• Remove the end-shield cover and hammer the back of
the rotor so that the bearing comes free (take care not to
damage the rotor).
• Sustain 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 7.2.2;the eight screws M16 should be fi xed with
28
a clamping torque of 310Nm.

7.2.3 Changing the bearing

The bearing can be changed without extracting the rotor:
• Unscrew the 8 screws that fasten the end-shield to the
housing.
• Hammer the shield evenly until it comes away from the
rotor.
• Remove the snap ring.
• Remove the bearing using a standard extractor.
• dilates before sliding it into position on the rotor.
• Replace the snap ring.
• Position the shield remembering to insert the snap ring
and fi t the screws leaving them loose.
• Hammer the shield evenly until the bearing and section of
housing are in place.
• Tighten the screws on the shield.
The eight screws M12 in the shield must be fi xed with a
clamping torque of 125Nm.

7.2.4 Changing rotating diodes

The rectifi er bridge can be changed by merely removing the
back shield as described in Changing the Bearing. Proceed
as follows:
• Remove completely the rear shield, being careful not to
harm the stator and exciter rotor windings.
• Unhook the diode bridge.
• Unscrew the screws and remove the diode bridge.
• Fit the new diode bridge by locking the screws with
threadlocking and hook up the terminals.
• Push the shield back in place and fasten it with the
screws.
7.2.5 Replacing components and component
assemblies
When assembling after changing a part repeat the above
operations in reverse.