TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download
Page 439 of 870
TM 9-2350-247-20-1 COOLANT HEATER MALFUNCTIONS—Continued 0086 00 HY 1. Check and see if heater exhaust is cold. 2. Is heater exhaust cold? YES NO GO TO JY (PAGE 0086 00-10) 2HY 1. Loosen fuel inlet line (1) to heater with heater switch on START. 2. Does fuel fail to flow out of loosened fitting? YES NO 2HYN 1. Faulty igniter. 2. Notify your supervisor. 3HY 1. Inspect fuel lines and heater. 2. Are all lines free from kinks, restrictions, or other damage? YES NO 3HYN 1. Replace heater fuel lines as required (WP 0475 00). 2. Verify no faults found. 4HY 1. Replace coolant heater fuel pump (WP 0475 00). 2. Verify no faults found. IY 1. Check and see if fuel pump stays on. 2. Does fuel pump stay on? YES NO IYN 1. Replace heater ON/OFF/START switch (WP 0472 00). 2. Verify no faults found. 2IY 1. Check if flame detector switch has been adjusted. 2. Has flame detector switch been adjusted? YES NO 2IYN 1. Flame detector switch needs adjustment. 2. Notify your supervisor. 0086 00-9