Jost Fifth Wheels Air-Activated Kingpin Unlock

SD DM 17.02.05
  1. Verify that both the yellow parking-brake and red trailer-air-supply knobs are out, the tractor and trailer parking brakes are set, and that the trailer is prepared for uncoupling.

    2. Note: With Jost fifth wheels, 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, release the pull valve.
Note:
Parent topic: Fifth Wheel Uncoupling
Document Number: 0000123488
Manual Publication Date: 2025-01-23
Topic Publication Date: 2025-01-23