TM 9-2320-209-20-3-2 FRAME 3 1. Using 1 3/16-inch combination box and open end wrench, unscrew coupling nut (1) and take off air hydraulic cylinder air line (2). 2. Using 5/8-inch open end wrench, unscrew coupling nut (3) and take off trailer service air line (4). GO TO FRAME 4 13-109