TM 9-2320-361-20 12-23. FUEL TANK MANHOLE COVER MAINTENANCE (M49A2C) This task covers: a. Removal d. Assembly b. Disassembly e. Installation c. Inspection INITIAL SETUP: APPLICABLE MODELS M49A2C MATERIALS/PARTS Two gaskets Fill gasket REFERENCES (TM) TM 9-2320-361-10 TM 9-2320-361-20P EQUIPMENT CONDITION Parking brake set (TM 9-2320-361-10). Fuel tanks drained (TM 9-2320-361-10). GENERAL SAFETY INSTRUCTIONS Keep fire extinguisher nearby when working on fuel tank trucks. WARNING Do not perform this procedure while smoking or within 50 feet of sparks or open flame. Fuel is flammable and can explode easily, causing injury or death to personnel and damage to equipment. NOTE Cover manhole opening in tank to avoid contamination. 1. Remove nut (12), washer (13), screw (14), and clamp ring (10) from manhole cover (15) and tank body (11). 2. Remove manhole cover (15) and gasket (9) from tank body (11). Discard gasket (9). b. Disassembly 1. Remove nut (18), springwell (17), spring (16), and screw (8) from fill cover (6) and latch (7). 2. Unscrew vent valve (1), and remove washer (2), gasket (3), fill retainer (4), fill gasket (5), and fill cover (6). Discard fill gasket (5) and gasket (3). 1. Inspect manhole cover (15), spring (16), and clamp ring (10) for cracks, bends, and damage. Replace manhole cover (15), spring (16), or clamp ring (10) if cracked, bent, or damaged. 2. Inspect vent valve (1) for stripped threads. Replace vent valve (1) if threads are stripped or damaged. 1. Install new fill gasket (5), fill retainer (4), new gasket (3), washer (2), and vent valve (1) on fill cover (6). 2. Install screw (8), spring (16), springwell (17), and nut (18) on fill cover (6) and latch (7). 12-40