TM 10-3930-669-20 7-3.  ALTERNATOR BELT ADJUSTMENT. This task covers: Adjustment INITIAL SETUP Tools and Special Tools Tool Kit, General Mechanic's: Automotive: (Item 1, Appendix B) Materials /Parts Washer, Lock Equipment Condition Engine OFF (TM 10-3930-669-10) Parking brake applied (TM 10-3930-669-10) Wheels chocked (TM 10-3930-669-10) Ventilation panel removed (Para 6-2) Batteries disconnected (Para 7-48) Adjustment. Adjustment. WARNING Allow engine to cool before performing maintenance.  Severe injury to personnel may result. (1) Loosen nut (1) on alternator lower mounting screw (2).  Do not remove. 7-6