Fontaine and Holland Fifth Wheels Air-Activated Kingpin Unlock
p3 dm 18.03.002
- 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.
- Pull and hold the kingpin release valve ( see Fig.) until the kingpin lock mechanism opens and locks in place.
- Release the pull valve.
- Release the tractor parking brake.
- Drive out from under the trailer.
Fig. 1, Air-Actuated Kingpin Release Valve
Note: On Fontaine and Holland fifth wheels, if the tractor parking brake is not set, the air-actuated kingpin-release valve will not activate.
Note: