Fifth Wheel Uncoupling; Manual Uncoupling - freightliner cascadia Driver Manual

09/10/2010
A. Lock held open by catch mechanism
Fig. 18.7, Jost Release Handle Unlocked
brakes are set. See
operation of the dash-mounted brake controls.
NOTICE
Attempting to couple at the wrong height may
cause improper coupling, which could result in
damage to the fifth wheel or kingpin.
7. Adjust the trailer height (if required).
For a standard fifth wheel plate, the trailer
should contact the fifth wheel approximately 4 to
8 inches (10 to 20 cm) behind the pivot. See
Fig. 18.4.
For a low-lube fifth wheel plate, the fifth wheel
must slide freely under the trailer, and the trailer
should contact the fifth wheel at the pivot. See
Fig. 18.5.
8. Back the tractor under the trailer.
On a standard fifth wheel, the fifth wheel must lift
the trailer.
On a low-lube fifth wheel, do not lift the trailer as
this may damage the fifth wheel plate.
9.
After sliding under the trailer, STOP to prevent
from hitting the kingpin too hard, then resume
backing slowly until the fifth wheel locks.
WARNING
A visual inspection is required by law. Some im-
proper couplings can pass a pull test. Sound is
not reliable. Get out of the cab and look. Incor-
rect coupling could cause the trailer to discon-
A
f311128
Chapter 5 in this manual for
nect, possibly resulting in serious personal injury
or death.
10.
Apply the tractor parking brake, then perform a
physical check for positive kingpin lockup, and
that there is no gap between the trailer and the
fifth wheel. See Fig.
11. Ensure that the release handle is in the locked
position adjacent to the casting. See
12. Release the tractor parking brakes and test for
kingpin lockup by slowly moving the tractor for-
ward, pulling on the trailer against the chocks.

Fifth Wheel Uncoupling

Manual Uncoupling

1.
Apply the tractor and trailer parking brakes.
2. Chock the trailer rear wheels.
3. Lower the trailer landing gear until the weight is
removed from the fifth wheel.
4.
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.
5. 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.
6. Release the kingpin locking mechanism following
the instructions for each manufacturer below.
6.1 Fontaine: Lift the safety latch and pull the
lock control handle to the unlocked posi-
tion. See Fig.
6.2
Holland: In the locked position the safety
indicator swings freely over the operating
rod. See Fig.
To unlock the mechanism, manually rotate
the safety indicator toward the rear of the
fifth wheel. See
Pull the operating rod out. When the
upper operating rod shoulder is outside
the slot, raise the handle and place the
shoulder of the upper rod against the plate
casting, above the slot. See
View C.
Fifth Wheels
18.6.
Fig. 18.8.
18.2.
18.9, View A.
Fig. 18.9, View B.
Fig. 18.9,
18.4