TM 9-2320-361-20 13-15. SECOND REDUCTION DRIVECHAIN MAINTENANCE (M764) This task covers: a. Removal c. Adjustment b. Installation INITIAL SETUP: APPLICABLE MODELS M764 MATERIALS/PARTS REFERENCES (TM) TM 9-2320-361-10 TM 9-2320-361-20P Clip EQUIPMENT CONDITION Two lockwashers Parking brake set (TM 9-2320-361-10). 1. Remove two screws (9), lockwashers (8), washer (7), and drivechain cover (10) from speed reducer (1) and cross chain cover (6). Discard lockwashers (8). 2. Remove clip (16), keeper (15), master link (14), and drivechain (11) from output shaft sprocket (2), carriage drive sprocket (12), and idler sprocket (5). Discard clip (16). 1. Install drivechain (11) on carriage drive sprocket (12), output shaft sprocket (2), and under idler sprocket (5). 2. Install master link (14) and keeper (15) on drivechain (11) with new clip (16). 1. 2. 3. 4. NOTE Perform step 1 if reduction drivechain cover has not been removed. Remove two screws (9), lockwashers (8), washer (7), and drivechain cover (10) from speed reducer (1) and cross chain cover (6). Discard lockwashers (8). Loosen jamnut (4) and adjust adjusting nut (3) to obtain 0.5 in. (1.3 cm) freeplay at midpoint (13) of drivechain (11) when pushing up on drivechain (11). Tighten jamnut (4) and ensure adjusting nut (3) does not move. Install drivechain cover (10) to speed reducer (1) and cross chain cover (6) with washer (7) two new lockwashers (8), and screws (9). - ., 13-26