TM 9-2320-209-20-3-2 FRAME 4 CAUTION Do not overtighten coupling nuts ( 1 and 2). Screw on and finger tighten coupling nuts onto fittings, then using 7/8–inch wrench, tighten nuts. 1. Slide two air reservoirs (3) one inch toward rear of truck. 2. Working at front of air reservoirs (3) and using 7/8-inch wrench, screw on and tighten two coupling nuts (1 and 2) . 3. Slide two air reservoirs (3) one inch toward front of truck. GO TO FRAME 5 13-213