TM 10-3930-664-10 2-3.  OPERATOR’S STATION a. Drivetrain Controls. KEY OR CONTROL FUNCTION 1 Accelerator Pedal Controls engine speed.  Depress pedal to increase engine speed.  Release pressure on pedal to decrease engine speed. 2 Service Brake and Inching Pedal Allows  4KRTFL  to  creep  forward  or  rearward  and  applies  service  brakes. Depress    pedal    slightly    to    gradually    reduce    pressure    on    clutches    in transmission   and   inch   4KRTFL.      Fully   depress    pedal    to    declutch    the transmission and apply brakes. 3 Steering Select Lever Controls   steering   mode.      Forward   position   selects   four   wheel   steering. Center   position   selects   two   wheel   steering.      Rear   position   selects   crab steering. 4 Rear Axle Disconnect Lever Controls engagement and disengagement of the transmission output shaft to the  driveshaft  to  the  rear  axle.    Pull  lever  upward  to  connect  the  rear  axle. Push lever downward to disconnect the rear axle.  This control is used only when 4KRTFL is to be towed. 2-9