TM-9-2320-361-24-2 Field Maintenance Manual Volume 2 for M44A2 Series Trucks
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TM 9-2320-361-24-2 0417 00 0417 00-4 ENGINE COOLANT HEATER FLAME DETECTOR SWITCH MAINTENANCE (Contd) ASSEMBLY 1. Install nut (7) and new sleeve (8) on probe (9). 2. Install switch bracket (13) on mount (6) with split roll pin (10). 3. Install microswitch (1) on switch bracket (13) with two screws (12) and new nut-assembled lockwashers (2). CAUTION Ceramic rod is very brittle and is easily broken; handle carefully. 4. Tilt microswitch (1) and switch bracket (13) back on mount (6) and insert ceramic rod (11) into probe (9). 5. Rotate microswitch (1) back on mount (6) and install spring (5), washer (4), and adjusting screw (3) on switch bracket (13) and mount (6). 6. Tighten adjusting screw (3) until microswitch (1) clicks. Then continue 3/4 turn past click point. INSTALLATION 1. Install flame detector switch (22) on heater housing (21) and tighten nut (7). 2. Install six leads (24) on flame detector switch (22) with five new screw-assembled lockwashers (23). 3. Install air tube (17), elbows (14) and (18) and ground lead (16) on heater housing (21) with new nut-assembled lockwasher (15). 4. Install guard (20) on heater housing (21) with four screws (19). 5. Test engine coolant heater (WP 0357 00). 6. Connect battery ground cable (WP 0126 00). 7. Release parking brake and remove wheel chocks (TM 9-2320-361-10).