TM 9-2320-209-20-3-3 18-54. DISCHARGE VALVE PACKING REMOVAL AND REPLACEMENT (TRUCKS M50A1, M50A2, AND M50A3). NOTE Truck M50A1 has three discharge valves, one for each compartment. Trucks M50A2 and M50A3 have two discharge valves, one for each compartment. This task can be used for all valves. TOOLS: Pliers 1 3/8-inch wrench Pick SUPPLIES: Discharge valve preformed packing PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedures. (1) Empty water from compartment for discharge valve being worked on. Refer to TM 9-2320-209-10 (2) Refer to discharge valve removal, para 18-53, for removal of bottom cover plate under tank section of chassis. b. Removal. FRAME 1 1. Working under truck and using pliers, take out and throw away cotter pin (1). 2. Slide lever (2) off stem (3). GO TO FRAME 2 18-272