Air-Activated Kingpin Unlock, Jost Fifth Wheels

4700 d 18.03.000
  1. Verify that both the parking brake and trailer air supply knobs are out (see Fig.), the tractor and trailer parking brakes are set, and that the trailer is prepared for uncoupling.

    2. Note: If the trailer parking brake is not set, the air-actuated valve will not activate.

  2. Release the tractor parking brake.
  3. Pull and hold the kingpin release valve, then drive forward slowly.
  4. After the trailer has slid down the fifth wheel and pick-up ramps, let go of the kingpin release valve.

    1. Trailer Air Supply Valve Knob

    2. Parking Brake Valve Knob

    Fig. 1, Brake Valve Knobs

Note:
Parent topic: Fifth Wheel Uncoupling
Document Number: 0000118810
Manual Publication Date: 2024-05-13
Topic Publication Date: 2024-06-10