TM 9-2320-209-20-3-3 18-60. DISPENSER HOSE ASSEMBLY REMOVAL AND REPLACEMENT (TRUCKS M50A1, M50A2, AND M50A3). TOOLS: Spanner wrench SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Removal. FRAME 1 1. Open rear compartment doors (1). 2. Close discharge valve control levers (2) by pushing them toward front of truck. 3. Close both gate valves (3) by turning to right. 4. Using spanner wrench, unscrew and take off dust cover (4). 5. Take reducer coupling (5) out of rear compartment (6). 6. Using spanner wrench, screw on and tighten reducer coupling (5) to delivery valve (7). 7. Using spanner wrench, unscrew and take off dispenser hose (8). END OF TASK 18-337