TM 9-2320-361-10 2-31. OPERATION OF PIPELINE CONSTRUCTION MAINTENANCE TRUCKS (Contd) NOTE Chain lengths must be the same. (5) Lock hook end of boom chains (6) into boom chain bracket (7), thirty links from hook. (6) Install A-frame sheave assembly (5) in trunnion (1), and secure with retaining pin (2) and two cotter pins (3). (7) Install tailboard sheave assembly (11) in rear well with retaining pin (8) and two cotter pins (9). (8) Loosen nuts (13) and (15), unscrew retaining pins (10) and (14), and turn side plates (12) and (4) 90°. Wear hand protection when handling winch cable. Broken wires may cause injury to personnel. (9) Pull cable (16) from winch (refer to b. of this para.), wrap under, around, and over tailboard sheave (11), and under, around and over A-frame sheave (5). (10) Turn pintle hook (17) so hook is on top, and secure hook end of cable (16) to pintle hook (17). (11) Turn side plates (12) and (4) back, screw in retaining pins (10) and (14), and tighten nuts (13) and (15). (12) Hook U-bolt (18) over tailboard sheave bracket (19). 2-152 WARNING