TM 9-2320-209-10-1 FRAME 7 1. Take up slack in winch cable (1) and slowly operate winch, refer to para 4-14b, until A-frame (2) reaches operating position. 2. If necessary, by hand, push A-frame (2) over center, until it is in operating position. 3. Let winch cable (1) go slack, and unhook U-bolt (3) from tailboard sheave assembly (4). Push U-bolt down even with truck bed. 4. Unhook winch cable (1) from pintle hook (5). NOTE Height of the A-frame (2) can be changed by making boom chains (6) longer or shorter. Place A-frame at a higher angle for heavy loads. Make a second (auxiliary) chain (7) fast to each safety chain (8) and to bumpers (9), so that there wont be any backlash. 4-277