TM10-3930-660-34 6-3.  ALTERNATOR - REPAIR/TEST (Cont’d) f.  If necessary, remove nut (32), connector (33), and battery terminal assembly parts (34). g.  If necessary, remove relay terminal cap (35), relay terminal assembly parts (36), and connector (37). h.  If necessary, remove nut (38) and wire lead (26) from regulator (28). NOTE If roller bearing (39) is not being removed, apply pressure sensitive tape over it for protection against dirt.  Do not use friction tape or other tape that will leave a residue behind. INSPECTION i.  If necessary for replacement, 1.  INSPECT BEARINGS (14 AND 39) FOR ROUGH push roller bearing (39) out of ROTATION OR VISIBLE DAMAGE. frame (5) and remove seal (41) and plug (40).  Discard seal (41). 2.  INSPECT BRUSHES (20) FOR EXCESSIVE WEAR. j.  If necessary, remove bushing (42) and pin (43) from frame (5). 3.  INSPECT BRUSH SPRINGS (31) FOR DISTORTION OR DISCOLORATION CLEANING TESTING 1.   CLEAN BRUSHES USING SOFT, DRY CLOTH. 1.  TEST DIODE TRIO (18). 2.   CLEAN SLIP RINGS ON ROTOR (7). a.  Remove diode trio (18). a.  Place rotor (7) in a lathe, with slip ring of shaft free. b.  Connect ohmmeter between diode trio single connector (44) and each of b.  While rotor is spinning in lathe, the other connectors (45, 46, and hold No.  00 sandpaper or 400 grit 47) in turn.  Observe resistance silicon carbide paper against slip reading on ohmmeter. ring surface. c.  Reverse ohmmeter leads, or reverse c.  After polishing slip rings, clean meter polarity, and repeat STEP b, using low pressure (15 psi above. maximum) compressed air. d.  At one polarity, resistance reading d.  Clean ball bearing (14) in dry should be low and at the other cleaning solvent to remove polarity, resistance reading should lubricant. be very high, if diodes are good. 6-5