TM 9-2320-361-20 14-36. SECONDARY HEATER AND DUCT REPLACEMENT This task covers: a. Heater, Exhaust Tube, and Guard Removal c. Duct Installation b. Duct Removal d. Heater, Exhaust Tube, and Guard Installation INITIAL SETUP: APPLICABLE MODELS REFERENCES (TM) M109A3 and M185A3 TM 9-2320-361-10 MATERIALS/PARTS Twelve lockwashers O-ring Two gaskets TM 9-2320-361-20P EQUIPMENT CONDITION Parking brake set (TM 9-2320-361-10). a. Heater, Exhaust Tube, and Guard Removal 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Disconnect heater harness (7) from heater (3). Remove clamp (10) and duct (13) from adapter (8). Remove eight screws (9) and adapter (8) from heater (3). Remove two clamps (2), heater (3), washer (11), and O-ring (12) from support (14). Discard O-ring (12). Remove screws (16) and (22), lockwasher (23), washer (24), and guard (21) from exhaust tube (20), tube adapter (27), and support (14). Discard lockwasher (23). Remove clamp (26) from exhaust tube (20) and tube adapter (27). Remove three screws (22), lockwashers (23), tube adapter (27), and gasket (28) from van wall (29). Discard lockwashers (23) and gasket (28). Remove four screws (16), gasket (15), and exhaust tube (20) from support (14). Discard gasket (15). Remove two screws (6), lockwashers (25), washers (5), two screws (17), lockwashers (18), washers (19), and support (14) from bracket (1). Discard lockwashers (18) and (25). Remove four screws (6), lockwashers (25), three flat washers (5), clamp (4), and bracket (1) from van wall (29). Discard lockwashers (25). 14-56