TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 3 Download
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TM 9-2320-280-20-3 11-190. HEATER REPLACEMENT (M997, M997A1, M997A2) This task covers: a. Removal b. Installation INITIAL SETUP: Applicable Models M997, M997A1, M997A2 Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Personnel Required One mechanic One assistant Manual References TM 9-2320-280-24P Equipment Condition ● Blower housing open (para. 11-198). ● Battery ground cable disconnected (para. 4-73). General Safety Instructions Diesel fuel is highly flammable. Do not perform this procedure near fire, flames, or sparks. WARNING Diesel fuel is highly flammable. Do not perform this procedure near fire, flames, or sparks. Severe injury or death may result. NOTE ● Have drainage container ready to catch fuel. ● Cover or plug all open connections immediately after disconnection to prevent contamination. Remove all covers or plugs prior to connection. 1. Disconnect plug (11) from heater receptacle (12). 2. Loosen clamp (8) and disconnect hose (9) from heater outlet (7). 3. Disconnect fuel line (13) from heater (14) and allow fuel to drain into container. 4. Remove two clamps (2) from heater (14) and mounting brackets (4). 5. Turn two dzus fasteners (16) and remove cover (15) from heater (14). 6. Remove heater (14) by lifting rear of heater (14) up and pulling heater (14) out from exhaust pipe (6) and sliding heater (14) to the right and out of intake assembly (1). 7. Inspect seal (5) for presence and damage. Replace if missing or damaged. 8. Remove four screws (10) and outlet (7) from heater (14). I b. Installation 1. Install outlet (7) on heater (14) with four screws (10). 2. Install two clamps (2) on mounting brackets (4). 3. Install heater (14) on mounting brackets (4), ensuring heater exhaust outlet (3) is installed into exhaust pipe (6), and clamps (2) are wrapped around heater (14). 4. Slide heater (14) into intake assembly (1) opening and on mounting brackets (4) with two clamps (2). 5. Connect fuel line (13) to heater (14). 6. Connect hose (9) to heater outlet (7) and tighten clamp (8). 7. Connect plug (11) to heater receptacle (12). 8. Install cover (15) on heater (14) with two dzus fasteners (16). 11-274