TM 9-2320-209-20-3-3 18-81. ROLLER DRIVE CHAIN REPAIR. TOOLS : Grinder SUPPLIES : Removable connecting link PERSONNEL: One EQUIPMENT CONDITION : Truck parked, engine off, handbrake set. a. Preliminary Procedures. (1) Remove horizontal leveling worm drive chain. Refer to para 18-78. (2) Remove rear winch drive chain. Refer to Part 4, para 19-13. (3) Remove reduction drive chain. Refer to Part 4, para 19-17. (4) Remove vertical leveling worm drive chain. Refer to para 18-79. 18-436