TM 9-2320-361-10 2-29. OPERATION OF TRACTOR AND FIFTH WHEEL (Contd) (1) Place semitrailer in proper location, set airbrake hand control lever (1) in down (on) position, and apply parking brake lever (8). (2) Shut off engine (refer to para. 2-17), move transmission gearshift lever (9) to “N” (neutral) position, and lower landing gear (2). (3) Remove cable electrical connector (6) from trailer receptacle (4) and secure. (4) Set airbrake hand control lever (1) in up (off) position, and turn cutout cocks (7) in up-and-down position, to turn off air supply. (5) Remove emergency and service hose coupling halves (5) from trailer emergency and service coupling halves (3), and secure. (6) Turn safety latch (12) to release locking plunger and move operating handle (11) forward until coupler jaws (10) are unlocked. (7) Start engine (refer to par. 2-14 or 2-15). (8) Release parking brake lever (8) and move tractor forward until fifth wheel (13) is clear of semitrailer skid plate (14). 2-140