TM 9-2320-209-20-3-3 18-78. HORIZONTAL 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 1 1/8-inch open end wrench 15/16-inch wrench 5/32-inch sockethead screw key Flat-tip screwdriver (Allen wrench or equivalent) Pliers 3/4-inch wrench (2) 2-inch open end wrench 7/16-inch wrench SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Removal. FRAME 1 1. Using screwdriver, take off safety wire (1). Using allen wrench, loosen setscrew (2). Take off cover retaining collar (3) . 2. Using 7/16-inch wrenches, unscrew and take off capscrew (4), lockwasher (5), and nut (6). 3. Using 15/16-inch wrench , unscrew and take off capscrew with lockwasher (7), flat washer (8), and bushing ( 9). Take off cover (10). GO TO FRAME 2 18-422