TM 9-2320-209-20-3-3 18-56. FRONT AND REAR DISCHARGE VALVE CABLES REMOVAL AND REPLACEMENT (TRUCKS M50A1, M50A2, AND M50A3). TOOLS: 1/2-inch wrench 7/8-inch wrench 13/16-inch wrench Pliers SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedure. Refer to discharge valve removal, para 18-53, for removal of bottom cover plate under tank section of chassis. b. Removal. (1) Rear discharge valve cable. FRAME 1 1. Working under rear of tank using 13/16-inch wrench, hold split nut (1). Using 7/8-inch wrench, unscrew and slide back thimble (2). Take off split nut (1). 2. Pull end of cable (3) out of thimble (2) and through hole in rear discharge valve lever (4). 3. Take thimble (2) off cable (3). GO TO FRAME 2 18-280