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TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 3 Download

Page 167 of 1170

10-87. HEATER ASSEMBLY REPLACEMENT This task covers: a. Removal b. Installation a. Removal 1. Remove tiedown strap (11) from cable (12) and clamp (10). Discard tiedown strap (11). 2. Loosen clamp (10) and disconnect diverter box duct (8) from heater assembly (9). 3. Disconnect harness lead 400D (13) from heater assembly lead (14). 4. Remove plain-assembled nut (18) and lead 57E (19) from heater assembly (9). Discard plain-assembled nut (18). 5. Loosen two clamps (1) and disconnect heater inlet hose (2) and heater outlet hose (16) from inlet port (3) and outlet port (15). 6. Loosen clamp (21) and remove hose (20) from clamp (21) on heater assembly (9). 7. Remove three screws (23) and washers (24) from air intake neck (22) and cowl (25). Remove neck (22) for access to heater mounting hardware. 8. Remove four locknuts (4), washers (5), capscrews (6), and washers (5) from heater assembly (9) and body (7). Discard locknuts (4). 9. Remove ten clips (26) from heater boot (27) and heater assembly (9). 10. Slide heater assembly (9) right and away from firewall (17) to allow heater inlet port (3) and outlet port (15) to clear grommet openings in firewall (17) and remove heater assembly (9). INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Parts Four locknuts (Appendix G, Item 79) Plain-assembled nut (Appendix G, Item 201) Tiedown strap (Appendix G, Item 307) Manual References TM 9-2320-280-10 TM 9-2320-280-24P Equipment Condition • Battery ground cable disconnected (para. 4-73). • Cooling system drained as required (para. 3-60). • Weathercap removed (para. 3-18). • Air cleaner assembly removed (para. 3-12). b. Installation 1. Install heater assembly (9) on firewall (17) and insert heater inlet port (3) and heater outlet port (15) through grommet openings in firewall (17). 2. Install heater boot (27) on heater assembly (9) with ten clips (26). 3. Install heater assembly (9) on body (7) with four washers (5), capscrews (6), washers (5), and locknuts (4). Tighten locknuts (4) to 15 lb-ft (20 N•m). 4. Install air intake neck (22) on cowl (25) with three washers (24) and capscrews (23). Tighten capscrews (23) to 6 lb-ft (8 N•m). 5. Connect heater inlet hose (2) and heater outlet hose (16) to heater assembly (9) inlet port (3) and outlet port (15) and tighten two clamps (1). 6. Install lead 57E (19) to heater assembly (9) with plain-assembled nut (18). 7. Connect harness lead 400D (13) to heater assembly lead (14). 8. Connect diverter box duct (8) to heater assembly (9) and tighten clamp (10). 9. Install hose (20) in clamp (21) on heater assembly (9) and tighten clamp (21). 10. Install cable (12) on clamp (10) with tiedown strap (11). TM 9-2320-280-20-3 10-144 Change 2