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TM-9-2320-361-24-2 Page 878

TM-9-2320-361-24-2 Field Maintenance Manual Volume 2 for M44A2 Series Trucks

Page 878 of 1144


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TM 9-2320-361-24-2 0431 00 0431 00-2 PERSONNEL HEATER FLAME DETECTOR SWITCH MAINTENANCE (Contd) REMOVAL NOTE Prior to removal, tag lead wires for installation. 1. Remove two screw-assembled lockwashers (8) and ignition control leads (4) from flame detector switch (7). Discard screw-assembled lockwashers (8). 2. Remove screw-assembled lockwasher (1) and blower motor lead (9) from flame detector switch (7). Discard screw-assembled lockwasher (1). 3. Remove two screw-assembled lockwashers (2) and receptacle leads (3) from flame detector switch (7). Discard screw-assembled lockwashers (2). 4. Loosen nut (6) and remove flame detector switch (7) from heater housing (5). DISASSEMBLY 1. Remove adjusting screw (10), washer (11), and spring (17) from microswitch (12) and mount (13). CAUTION Ceramic rod is very brittle and is easily broken; handle carefully. Failure to comply may result in equipment damage. 2. Tilt microswitch (12) back on mount (13). 3. Invert microswitch (12) and remove ceramic rod (18) from probe (14). 4. Remove nut (15) and sleeve (16) from probe (14). CLEANING AND INSPECTION Inspect flame detector switch (7) for oxidation and dirt, broken ceramic rod (18), and bent or distorted probe (14). If oxidized or dirty, clean by removing ceramic rod (18) and lightly rapping side of probe (14) to loosen oxides and dirt. Replace flame detector switch (7) if ceramic rod (18) is broken or probe (14) is damaged. ASSEMBLY CAUTION Ceramic rod is very brittle and is easily broken; handle carefully. Failure to comply may result in equipment damage. 1. Tilt microswitch (12) back on mount (13) and insert ceramic rod (18) in probe (14). 2. Position spring (17) in place and tilt microswitch (12) back into position. 3. Install washer (11) and adjusting screw (10) until microswitch (12) clicks, then continue an additional 3/4 turn. 4. Install sleeve (16) and nut (15) on probe (14). INSTALLATION 1. Install flame detector switch (7) on heater housing (5). Tighten nut (6). 2. Install receptacle leads (3) on flame detector switch (7) with two new screw-assembled lockwashers (2). 3. Install blower motor lead (9) on flame detector switch (7) with new screw-assembled lockwasher (1). 4. Install ignition control leads (4) on flame detector switch (7) with two new screw-assembled lockwashers (8). 5. Install personnel heater guard (WP 0427 00). 6. Connect battery ground cable (WP 0126 00). 7. Release parking brake and remove wheel chocks (TM 9-2320-361-10).