2. Back the tractor fifth wheel into the
trailer kingpin to engage and lock.
JOST Fifth Wheel Indication
If equipped with JOST fifth wheel
3. Pull the tractor forward to ensure
the kingpin has been locked in
place.
4. Set the tractor parking brake.
5. Connect the tractor brake air and
electric lines to the trailer.
Conduct a pre-trip inspection prior to
releasing the brakes, raising the landing
gear, and driving the vehicle.
How to Release the Kingpin
Remotely (option)
CAUTION
Do not deflate the rear suspension be-
fore unlocking the fifth wheel. Deflating
the rear suspension before unlocking
the fifth wheel could cause difficulty
during uncoupling and result in dam-
age to the fifth wheel and kingpin.
1. Set both the vehicle and trailer
parking brakes.
2. Lower the landing gear.
3. Disconnect the tractor brake air
and electric lines from the trailer.
4. Flip up cover, then press and hold
the Kingpin Release switch for 3
seconds. A countdown timer popup
will appear on the display, and the
unlock symbol on the Kingpin
Release switch will illuminate.
The popup will inform the operator
when to release the switch.
JOST Fifth Wheel Indication
If equipped with JOST Fifth Wheel
NOTE
The fifth wheel will not unlock unless
the vehicle is stopped and the parking
brake is set. In this situation, a red-col-
ored popup appears, informing the op-
erator that kingpin release is not avail-
able and to set the parking brake. This
will require restarting this procedure.
5. Release the switch.
The unlock symbol on the Kingpin
Release switch will turn off.
6. Ease tractor forward enough for the
kingpin to clear the fifth wheel
(about 12 to 18 inches).
NOTE
Do not drive tractor free of trailer.
7. If the tractor has a rear air
suspension, deflate (dump) the
rear suspension enough so that the
DRIVING - Trailer Operations
Y53-6076-1D1 (09/20) 155
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