TM 9-2320-209-20-3-3 18-79. VERTICAL LEVELING WORM DRIVE CHAIN REMOVAL AND REPLACEMENT (TRUCK M764). NOTE This task is the same for the first and second reduction chains. This task is shown for the second reduction chain. TOOLS : Adjustable wrench Pliers 15/16-inch open end wrench 3/4-inch wrench (2) Flat-tip screwdriver 1 l/8-inch wrench SUPPLIES : Removable connecting link PERSONNEL: One EQUIPMENT CONDITION : Truck parked, engine off, handbrake set. a. Removal. 1. Using 15/16-inch wrench, unscrew and take off nut (1) and lockwasher (2). 2. Using 15/16-inch wrench, unscrew and take off capscrew (3), lockwasher (4), flat washer (5), and bushing (6) . Take off cover (7). GO TO FRAME 2 18-428