Air-Activated Kingpin Unlock, Fontaine and Holland Fifth Wheels

4700 d 18.03.002
  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 tractor parking brake is not set, the air-actuated kingpin-release valve will not activate.

  2. Pull and hold the kingpin release valve (see Fig.) until the kingpin lock mechanism opens and locks in place.

    Fig. 1, Air-Actuated Kingpin Release Valve

  3. Let go of the kingpin release valve.
  4. Release the tractor parking brake.
  5. Drive out from under the trailer.

    1. Trailer Air Supply Valve Knob

    2. Parking Brake Valve Knob

    Fig. 2, Brake Valve Knobs

Note:
Parent topic: Fifth Wheel Uncoupling
Document Number: 0000118833
Manual Publication Date: 2024-05-13
Topic Publication Date: 2024-06-10