TM10-3930-660-20 16-7. CAB  DOORS   - SERVICE/REPLACE (Cont’ d) 1. REMOVE UPPER DOOR (9). a. b. c. d. e. Trip door latch (8) which secures upper door (9) to the lower door (10) . Remove two nuts (11) on upper door hinges (12). Swing upper door (9) open and lift door (9) up to remove door (9). Remove capscrews (13). If necessary, remove Capscrew (14), nut (16) and door holder (15). 2. REMOVE LOWER DOOR (10). a. b. c. d. e. Remove two capscrews (17), two flatwashers (18), and holding strap (19) from lower door (10). Remove two nuts (20) on lower door hinges  (21). Swing lower door (10) open, lift door up, and remove lower door (10), Remove capscrews (22). If necessary, remove weatherstripping (23). 16-9