TM-9-2320-361-24-2 Field Maintenance Manual Volume 2 for M44A2 Series Trucks
Page 828 of 1144
TM 9-2320-361-24-2 0420 00 0420 00-2 ENGINE COOLANT HEATER COMPONENT BRACKET MAINTENANCE (Contd) REMOVAL NOTE Prior to removal, tag lead wires for installation. 1. Remove tiedown strap (1) from wires. Discard tiedown strap (1). 2. Remove two screw-assembled lockwashers (4), and leads (2), (3), and (5) from heater component bracket (6). 3. Remove leads (3) and (8) from restriction thermostat (9). 4. Remove grommet (11) from leads (3) and (8) and heater housing (10). 5. Remove three screw-assembled lockwashers (16) and leads (13), (14), (15), and (17) from flame detector switch (12). Discard screw-assembled lockwashers (16). 6. Remove four screws (7) and heater component bracket (6) from heater housing (10). DISASSEMBLY NOTE Prior to disassembly, note direction of arrow on diode for installation. 1. Remove diode (23) from diode holder (22). 2. Remove screw-assembled lockwashers (20) and (26), resistor leads (19) and (27), and diode lead (21) from terminal strip (29). Discard screw-assembled lockwashers (20) and (26). 3. Remove screw-assembled lockwasher (25) from diode holder (22) and terminal strip (29). Discard screw-assembled lockwasher (25). 4. Remove screw (24) and diode holder (22) from heater component bracket (31). 5. Remove four screw-assembled lockwashers (28), terminal strip (29), and plate (30) from heater component bracket (31). Discard screw-assembled lockwashers (28). 6. Remove nut-assembled lockwasher (34), screw (37), and resistor (18) from resistor holder (35). Discard nut-assembled lockwasher (34). 7. Remove four screw-assembled lockwashers (36) and receptacle (33) from heater component bracket (31). Discard screw-assembled lockwashers (36). 8. Remove nut-assembled lockwasher (32) and resistor holder (35) from heater component bracket (31). Discard nut-assembled lockwasher (32). INSPECTION 1. Check diode (23) for continuity. Reverse leads on diode (23) and check for continuity. If circuit is open in both test conditions or closed in both test conditions, replace diode (23). 2. Check resistor (18) for continuity. If continuity does not exist, replace resistor (18).