TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
Page 157 of 1176
0008 00-29/30 blank MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 3. HEATER OVERHEATS, CONTINUES TO RUN Test overheat switch (WP 0426 00 and WP 0435 00). Replace overheat switch if defective (WP 0422 00 and WP 0433 00). 4. HEATER OUTPUT TOO LOW 1. Check for obstructed fuel lines or contaminated fuel supply. 2. Check fuel control valve (WP 0421 00 and WP 0428 00). Clear obstructions from fuel lines and drain contaminated fuel supply. Replace fuel control valve if defective (WP 0421 00 and WP 0428 00). 5. HEATER SMOKES AND BANGS WHEN STARTING Check fuel control valve (WP 0421 00 and WP 0428 00). Replace fuel control valve if defective (WP 0421 00 and WP 0428 00). 6. BLOWER WILL NOT STOP AFTER TURNOFF Check flame detector switch condition (WP 0421 00 and WP 0428 00). Replace fuel detector switch if defective (WP 0417 00 and WP 0431 00). 7. ODOR OF FUEL IN VENTILATING AIR 1. Check for leaking fuel connections at stand pipe and fuel valve. 2. Check burner preformed packing and gasket (WP 0424 00 and WP 0432 00). Tighten connections if loose (WP 0421 00 and WP 0428 00). Replace preformed packing and gasket if defective (WP 0424 00 and WP 0432 00). 8. BLOWER RUNS BUT HEATER FAILS TO IGNITE 1. Test igniter (WP 0426 00 and WP 0435 00). 2. Check fuel control valve (WP 0421 00 and WP 0428 00). 3. Check for obstructed ignition air passages. Replace igniter if defective (WP 0422 00 and WP 0429 00). Replace fuel control valve if defective (WP 0421 00 and WP 0428 00). Clear ignition air passages of obstructions. 9. HEATER SMOKES DURING NORMAL OPERATION 1. Check for blower motor operation (WP 0418 00 and WP 0427 00). 2. Test fuel control valve (WP 0426 00 and WP 0435 00). Replace blower motor if defective (WP 0418 00 and WP 0427 00). Replace fuel control valve if defective (WP 0421 00 and WP 0428 00). TM 9-2320-361-24-1 0008 00 MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd) Table 13. Winterization Kits Troubleshooting Procedures (Contd). END OF WORK PACKAGE