2.
Pull and hold the kingpin release valve
(Fig. 17.10) until the kingpin lock mechanism
opens and locks in place.
3.
Release the pull valve.
4.
Release the tractor parking brake.
5.
Drive out from under the trailer.
Jost Fifth Wheels Air-Activated Kingpin
Unlock
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.
11/02/2010 f311133
A
B
C
D
1
2
3
4
A. Locked Position
B. Unlatched Position (safety indicator rotated towards the
rear of the fifth wheel)
C. Lockset Position (upper rod resting against casting
above slot)
D. Open Position (ready for recoupling)
1. Safety Indicator
2. Operating Rod
3. Upper Rod
4. Plate Casting
Fig. 17.9, Holland Kingpin Locking Mechanism
Fifth Wheels
17.6
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