SI Series Alternator Repair

RECTIFIER END BEARING REPLACEMENT

Testing Of SI Series Alternators - Part 3 Of 3:

For service, refer to image.




DRIVE END BEARING REPLACEMENT

Testing Of SI Series Alternators - Part 2 Of 3:

For service, refer to image.




SLIP RING SERVICING

If the slip rings are dirty, they may be cleaned and finished with 400 grain or finer polishing cloth. Spin the rotor, and hold the polishing cloth against the slip rings until they are clean.
The rotor must be rotated in order to clean the slip rings evenly. Cleaning the slip rings by hand without spinning the rotor may result in flat spots on the slip rings, causing brush noise.
Slip rings which are rough or out of round should be trued in a lathe to 0.002 inch maximum indicator reading. Remove only enough material to make the rings smooth and round. Finish with 400 grain or finer polishing cloth and blow away all dust.


BRUSH HOLDER AND REGULATOR REPLACEMENT

Testing Of SI Series Alternators - Part 1 Of 3:

Testing Of SI Series Alternators - Part 2 Of 3:

Disassembly
NOTE: Refer to figures for views.
1. Make scribe marks on end frames to facilitate reassembly.
2. Remove thru bolts and separate end frames.
3. Remove three attaching nuts and regulator attaching screws.
4. Separate stator, diode trio and regulator from end frame.
5. Put brushes in holder and retain in place with brush retaining wire.

Reassembly:
1. Place assembled brush holder in end frame with retaining wire protruding through the end frame.
2. Reverse the procedure, installing the regulator, diode trio, and stator.
3. Reassemble the two end frames with the attaching bolts.
4. With the alternator completely assembled, remove the brush retaining wire from the back of the alternator.