Moving the air slide control valve switch to the lock
position deactivates the control valve and locks the
fifth wheel to the baseplate. Moving the switch to the
SLIDE position activates the control valve and
unlocks the fifth wheel slide mechanism, allowing
changes to the total length of the tractor-trailer and
changes to axle loads to comply with varying
jurisdictional laws.
Air Slide Operation
1.
Set the air-slide switch to SLIDE.
Ensure the locking plungers have released.
For Fontaine fifth wheels, see
Fig. 17.27 and
Fig. 17.28 for depictions of the locked and
unlocked states.
For Holland fifth wheels, locking plungers retract
as shown in
Fig. 17.29.
For Jost fifth wheels, the mechanism activates
as shown in
Fig. 17.30.
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.
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.
f31139911/05/2021
Fig. 17.27, Locked Fontaine Air-Operated Sliding Fifth
Wheel
f31140011/05/2021
Fig. 17.28, Unlocked Fontaine Air-Operated Sliding
Fifth Wheel
f31136408/25/2021
A
B
2
2
2
1
1
1
1
A. Unlocked with plungers retracted.
B. Locked with plungers in rack.
1. Racks 2. Plungers
Fig. 17.29, Holland Air-Operated Sliding Fifth Wheel
Fifth Wheels and Trailer Couplings
17.11
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