TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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TM 9-2320-361-24-1 0006 00 0006 00-28 MECHANICAL SYSTEMS TROUBLESHOOTING - UNIT (Contd) Table 21. Personnel Fuel Burning Heating Troubleshooting Procedures (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 2. HEATER WILL NOT OPERATE WARNING • Diesel fuel is flammable. Do not perform troubleshooting checks near open flame, sparks, or electricity. Injury or death to personnel may result. • Compressed air source must not exceed 30 psi (207 kPa). Wear eyeshields when cleaning with compressed air. Failure to wear eyeshields may result in injury to personnel. 1. Refer to Heating System Troubleshooting Procedures in WP 0015 00, malfunction 3. 2. Make sure fuel shutoff valve is in full ON position. 3. Check heater fuel filter for contamination (WP 0354 00). 4. Check fuel lines for breaks, bends, kinks, or leaking joints. 5. Check fuel pump discharge. 6. Inspect exhaust system for restrictions. 7. Check for proper operation of defroster and heat diverter control cables (TM 9-2320-361-10). If fuel shutoff valve is damaged (or stuck in OFF or partial ON position), replace fuel shutoff valve (WP 0377 00). If water or contamination is present, clean and flush entire fuel system. Dry with compressed air. If broken, kinked, or leaky joints are found in fuel lines, replace (WP 0376 00 and WP 0383 00). 1. Remove fuel line from fuel pump output (WP 0353 00). 2. Use a clean container for fuel discharge recovery. 3. Position heater control box to RUN position. 4. If fuel pump fails to pump an adequate amount of fuel, 1/2 pint (0.24 liter) in 30 seconds, replace (WP 0353 00). If exhaust pipe is restricted or damaged, repair or replace (WP 0355 00). 1. If vent or control cables are broken, replace (WP 0248 00 and WP 0249 00). 2. If fuel burning heater still fails to operate, replace fuel burning heater (WP 0351 00). END OF WORK PACKAGE