TM 9-2320-361-10 2-31. OPERATION OF PIPELINE CONSTRUCTION MAINTENANCE TRUCKS (Contd) (6) Hand pull boom chains (9) to bring A-frame (8) over center to an angle of about 80°, and use winch (refer to b, of this para.) to slowly lower A-frame (8) to rest on top of cab protector (11). (7) Remove hook end of cable (2) from pintle hook (10) and unhook U-bolt (7) and lower until flush with truck bed. (8) To disassemble and secure A-frame (8), reverse steps c.1 through c.12. e. Rigging A-frame for Side Operation. (1) Remove screws (15) and gin pole link holding pins (16). (2) Loosen wingnuts (17) and remove gin poles (19) from side clamps (18). (3) Remove gin pole mounting adapters (12) from storage compartment and install in front and rear stake pockets with lockwashers (14) and screws ( 13). 2-155