TM 9-2320-209-10-1 FRAME 5 1. Pull up on dummy coupling (1) and take it off semitrailer emergency airbrake coupling half (2). CAUTION Be sure to plug tractor emergency airbrake hose to semitrailer emergency coupling and service airbrake hose to service coupling. Hoses not hooked up right can cause brakes not to operate. 2. Place tractor emergency airbrake hose coupling half (3) to semitrailer emergency coupling half (2) and turn it down to lock. GO TO FRAME 6 4-221