freightliner PX113064S T 2016, Manual

Page: 173 / 236

Fifth Wheel Slide
WARNING
Adjust the fifth wheel slide correctly. 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 serious
personal injury or death.
On sliding fifth wheel assemblies, the fifth-wheel
plate is attached to rails that allow forward and
rearward movement of the fifth wheel to optimally
distribute 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.
The maximum axle weight ratings are shown on the
Federal Motor Vehicle Safety Standard (FMVSS)
label or Canadian Motor Vehicle Safety Standard
(CMVSS) label; see the ’Vehicle Identification’
chapter for the location of these labels on your
vehicle. 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.
Fifth Wheel Slide Control Switch
NOTICE
Do not activate the fifth wheel slide control valve
while the vehicle is in motion. To do so could
cause damage to the fifth wheel member, the
kingpin, the cab or trailer, and ultimately to the
drivetrain.
The fifth wheel air slide switch operates an air
cylinder that locks and unlocks the slide. See
Fig. 14.25 .
Moving the air slide control valve switch to the lock
position deactivates the control valve and locks the
fifth wheel to the baseplate. Moving the switch to the
SLIDE position activates the control valve and
unlocks the fifth wheel slide mechanism, allowing
changes to the total length of the tractor-trailer and
changes to axle loads to comply with varying
jurisdictional laws.
f611984 11/23/2021
Fig. 14.23, Kingpin Release Activated Popup, ICC5
f611986 11/23/2021
Fig. 14.24, Kingpin Release Not Confirmed Popup, ICC5
f611343 09/28/2016
AIR
SLIDE
SLIDE
LOCK
Fig. 14.25, Fifth Wheel Slide Control Switch
Fifth Wheels
14.10