TM 9-2320-209-34-2-3 b. Removal. FRAME 1 WARNING 1. 2. 3. 4. 5. Smoking, sparks or open flames are not allowed within 50 feet of work area during this task. Fuel can explode, causing injury to personnel and damage to equipment. Working in battery box, shut off fuel cock (1). Unscrew fitting (2) and pull fuel line (3) from fuel control valve (4). Take out cotter pin (5) and slide off exhaust pipe elbow (6) from heater (7). Unscrew and unplug electrical connector (8) from heater (7). Unscrew and open two heater retainer clamps (9) and take out heater assembly (7). END OF TASK 21-17