Air-Actuated Uncoupling
A dash-mounted kingpin release switch (if equipped)
may be used to uncouple the trailer. See
Fig. 20.9.
NOTE: In the event of an air system failure, air-
actuated kingpins can be manually released fol-
lowing the instructions for manual unlocking.
WARNING
Once the kingpin release switch has been
pushed, the kingpin lock is released. The vehicle
MUST NOT be driven with the trailer until the
trailer has been uncoupled and coupled again.
Failure to do so may result in separation of the
trailer from the tractor, possibly causing serious
personal injury or death.
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. 20.8, Holland Kingpin Locking Mechanism
Fifth Wheels
20.5
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