Then lock the handle into the open
position on the notch provided.
Or, in the event of a failure in an air
release system, pull the handle directly
out and hook it open on the notch as
shown in
Fig. 17.21.
8.
Release the tractor parking brake then drive
forward slowly, allowing the trailer to slide down
the fifth wheel and off the ramps.
Air-Actuated Uncoupling
A dash-mounted kingpin release switch (if so
equipped) may be used to uncouple the trailer. See
Fig. 17.22.
NOTE: In the event of an air system failure, air-
actuated kingpins can be manually released
following the instructions for manual uncoupling.
If there is an issue,
Fig. 17.23 should appear on
the driver’s display screen.
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.
Preparing the Trailer for Uncoupling
Before using the air valve to unlock a fifth wheel
kingpin, prepare the trailer as follows.
1.
Slowly back the tractor tightly against the trailer
to relieve pressure on the fifth wheel locks.
2.
Apply the tractor and trailer parking brakes.
3.
Chock the trailer rear wheels.
4.
Lower the trailer landing gear until the weight is
removed from the fifth wheel.
5.
Disconnect the tractor-to-trailer air lines and
electrical cable. Plug the air lines to prevent dirt
or foreign material from entering the lines.
Air-Activated Kingpin Unlock
NOTE: The kingpin release will not activate if
the vehicle is moving, the parking brake is not
set, or if the switch is pushed for less than 3
seconds. Unless all of these conditions are met,
the trailer will not be uncoupled.
If the kingpin release switch is pressed for less
than 3 seconds,
Fig. 17.24 will appear on the
driver display. Press the back arrow to dismiss
the popup.
f31139711/01/2021
A
B
A. Pull the retractable handle out.
B. Hook the handle open using the notch.
Fig. 17.20, Jost Release Handle Unlocked
f611341
03/09/2016
K−PIN
REL
Fig. 17.22, Kingpin Release Switch
f61198811/24/2021
Fig. 17.23, Kingpin Release Not Confirmed Popup,
ICUC
Fifth Wheels and Trailer Couplings
17.9
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