guide plate to hold it out. The slide re-
lease pull handle will stay in the unlocked
position until it is manually disengaged
from the guide plate.
3.
Lower the trailer landing gear just enough to re-
move the weight from the tractor.
4.
Pull the trailer air supply valve to cut off the air
supply to the trailer.
WARNING
Do not use the trailer air supply for parking trail-
ers not equipped with spring parking brakes.
This applies the trailer service brakes only. As air
bleeds from the trailer brake system, brake appli-
cation is lost. This could allow the unattended
vehicle to roll away, possibly resulting in serious
personal injury or death.
5.
Chock the front and rear of the trailer tires to
prevent the trailer from moving.
CAUTION
After moving the fifth wheel to the desired posi-
tion, be sure the trailer landing gear will not, at
any time, come in contact with the tractor frame
or other components. Make sure that the front of
the trailer will not come in contact with the rear
of the cab or with other components if they ex-
tend beyond the rear of the cab.
6.
Slowly move the tractor forward or backward
until the fifth wheel is in the desired location.
7.
Apply the tractor parking brakes.
NOTE: The fifth wheel may have to be moved
slightly to enable the locking wedges to enter
the fully locked position.
8.
Lock the sliding member in position using one of
the following methods:
WARNING
Check that the locking wedges have seated in the
slots. Failure to achieve complete lockup may
allow disengagement of the tractor from the
trailer, possibly resulting in serious personal in-
jury or death.
8.1
For air-operated release models, set the
cab-operated slide control switch to
LOCK. Visually inspect the locking
wedges to make sure that they are fully
inserted in the slide rail slots.
8.2
For manual release models, disengage
the slide release pull handle from the
guide plate. The slide release pull handle
is spring-loaded in the locked position and
will seek the locked position when disen-
gaged from the guide plate. The fifth
wheel may have to be moved slightly to
enable the locking wedges to fully enter
the locked position. When the slide re-
lease pull handle returns to the fully
locked position, visually and physically
check the locking wedges to make sure
they are fully inserted into the slots in the
slide rails. Make sure the slide release pull
handle is locked in position against the
guide plate.
9.
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 given 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
10/26/2010
f310050
Fig. 10.19, Fontaine Sliding Fifth Wheel Manual Release
Fifth Wheels and Trailer Couplings
10.15
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