Fifth Wheel Uncoupling - freightliner M2 Plus 2023 Manual

04/28/2017
8. Release the tractor parking brakes and test for
kingpin lockup by slowly moving the tractor
forward, pulling the trailer against the chocks.
9. After lockup is verified, connect the tractor-to-
trailer air system lines and the electrical cable to
the trailer. Take care to prevent dirt or foreign
material from entering the air system lines.
NOTICE
Always make sure the connection hanger keeps
the trailer air hoses and electrical cables
positioned so that they do not rub on anything.
Rubbing may wear through hoses or cables,
resulting in air leaks, or exposed or broken wires,
potentially affecting trailer brake or electrical
systems.
10. Charge the air brake system with air, checking
that the air connections do not leak.
11. Fully retract the landing gear legs and secure the
crank handle.
12.
Remove the chocks.

Fifth Wheel Uncoupling

Manual Uncoupling
1. Slowly back the tractor tightly against the trailer
to relieve pressure on the fifth wheel lock.
2. Apply the tractor and trailer parking brakes.
Fifth Wheels and Trailer Couplings
OK
Fig. 17.19, Jost Release Handle Locked
3.
4.
5.
6.
7.
Chock the trailer rear wheels.
Lower the trailer landing gear until the weight is
removed from the fifth wheel.
Disconnect the tractor-to-trailer air system lines
and electrical cable. Plug the air lines to prevent
dirt or foreign material from entering the lines.
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.
Release the kingpin locking mechanism following
the instructions for each manufacturer below.
7.1
Fontaine: Lift the safety latch and pull the
lock control handle to the unlocked
position as shown in
7.2 Holland FW35/33: Pull out the release
handle as shown in
7.3 Holland FWAL: Slide the handle forward
to move the front notch on the locking
plate clear of the bracket.
Pull the handle completely out.
Slide the handle forward again to hook the
rear notch on the locking plate onto the
bracket as shown in
7.4 Jost: Depending on the fifth wheel either:
Lift the release handle up into the wide
slot and then pull the handle out while
moving it forward as shown in
OK
f311127
Fig. 17.3.
Fig. 17.10.
Fig. 17.11.
Fig. 17.17.
17.8