Manual Slide Operation; Fifth Wheel Slide - freightliner cascadia Driver Manual

Fifth Wheels
10/26/2010
Fig. 18.10, Air-Actuated Kingpin Release Valve
NOTE: With Jost fifth wheels, if the trailer park-
ing brake is not set the air-actuated valve will
not activate.
2. Release the tractor parking brake.
3. Pull and hold the kingpin release valve, then
drive forward slowly.
4. After the trailer has slid down the fifth wheel and
pick-up ramps, release the pull valve.

Fifth Wheel Slide

WARNING
Adjust the fifth wheel slide correctly, and do not
overload any tractor axle by incorrectly loading
the trailer. Incorrect slide adjustment or improper
axle loading could cause erratic steering and
loss of vehicle control, possibly resulting in seri-
ous personal injury or death.
On sliding fifth wheel assemblies, the fifth-wheel
plate is attached to rails that allow forward and rear-
ward movement of the fifth wheel to optimally distrib-
ute the load across the axles. Slots are evenly
spaced along the slide rails, and retractable wedges
are positioned through the slots to hold the fifth
wheel in the desired position.
The amount of load distribution on the front steering
axle and rear drive axle(s) will have a direct effect on
the steering control of the vehicle. Determine the
front and rear axle weights by weighing the vehicle
on scales designed for this purpose.
18.7
The maximum axle weight ratings are shown on the
Federal Motor Vehicle Safety Standard (FMVSS)
label or Canadian Motor Vehicle Safety Standard
(CMVSS) label attached to the left rear door post of
the tractor. The desired load on the axle is no less
than 80 percent of the maximum axle weight rating,
but in no instances should the axle load exceed the
maximum axle weight rating given on the FMVSS or
CMVSS label.

Manual Slide Operation

The manual slide feature is operated from the fifth
wheel plate with a manual release handle using the
following procedure. See
f611102
07/25/95
1. Locking Wedge
2. Slide Release Pull Handle
Fig. 18.11, Manual Release Sliding Fifth Wheel
1. Stop the tractor and trailer in a straight line on
level ground. Pull the red trailer air supply knob
to apply the trailer parking brakes.
2. Apply the tractor parking brake, then release the
sliding mechanism using the appropriate method
for the fifth wheel manufacturer.
2.1 Fontaine: Lift the slide release pull handle
to disengage it from the guide plate. Then,
pull out the handle until it is in the un-
locked position and can be positioned
against the guide plate to hold it out. The
Fig. 18.11.
1
2
(Fontaine shown)
f310190