Air Slide Operation

sdp dm 17.04.003
  1. Set the air-slide switch to SLIDE.
    Ensure the locking plungers have released.
    For Fontaine fifth wheels, see Fig. and Fig. for depictions of the locked and unlocked states.
    For Holland fifth wheels, locking plungers retract as shown in 
    For Jost fifth wheels, the mechanism activates as shown in Fig. .

    Fig. 1, Locked Fontaine Air-Operated Sliding Fifth Wheel

    Fig. 2, Unlocked Fontaine Air-Operated Sliding Fifth Wheel

    • Unlocked with plungers retracted.

    • Locked with plungers in rack.

    1. Racks

    2. Plungers

    Fig. 3, Holland Air-Operated Sliding Fifth Wheel

    • Unlocked

    • Locked

    Fig. 4, Jost Sliding Fifth Wheel

  2. Lower the trailer landing gear just enough to remove the weight from the tractor.
  3. Pull the red trailer-air-supply knob to set the trailer-parking brakes.
  4. Slowly move the tractor forward or backward until the fifth wheel is in the desired location.

    5. Note: Ensure the trailer landing gear does not come in contact with the tractor frame or other components, and that the front of the trailer will not come in contact with the rear of the cab or other components if they extend beyond the rear of the cab.

  5. Apply the tractor parking brakes.

    6. Warning: Check that the locking wedges have seated in the slots. Failure to achieve complete lockup may allow disengagement of the tractor from the trailer, possibly resulting in serious personal injury or death.

  6. Set the air-slide switch to LOCK. Visually inspect the locking wedges or plungers to make sure that they are fully inserted in the slide rail slots. The fifth wheel may need to be moved slightly to enable the locking wedges to fully lock.
    Further verify that the plungers have engaged by tugging the tractor forward while the trailer brakes are locked and the wheels are chocked.
Note:
Parent topic: Fifth Wheel Slide
Document Number: 0000111059
Manual Publication Date: 2024-09-03
Topic Publication Date: 2024-05-02