TM 9-2320-361-10 f. Pipeline Construction Maintenance Truck (M756A2). Key 1 2 3 4 5 6 7 8 9 10 11 12 Item and Function Body Floodlights provides illumination for night operations. A-frame Sheave is used to position winch cable for lifting. Chain Slots are used to secure boom chain to vehicle for rear operations. Side Clamps are used to secure gin poles in stored position. Chain Brackets are used to secure boom chains to vehicle body for side operations. Boom Chains are used to secure A-frame in desired operation positions. Safety Chains are used to steady gin poles and prevent backlash. Stiff Leg Jacks are removed from their compartments and positioned on ground to support vehicle when A-frame is being used to lift heavy objects near end of the body. Body Sheave is used to keep winch cable in proper alinement with respect to the A-frame sheave and the winch. U-bolt is used to support and position body sheave for lifting A-frame into position. Tailboard Roller is used to assist rear winch in loading/unloading of heavy objects. Gin Poles are positioned to form an A-frame for lifting. 2-18 2.5 BODY EQUIPMENT CONTROLS AND INDICATORS (Contd)