(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 rat-
ing given on the FMVSS or CMVSS label.
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.
Fifth Wheel Lubrication
WARNING
Keep the fifth wheel plate lubricated to prevent
binding between the tractor and trailer. A binding
fifth wheel could cause erratic steering and loss
of vehicle control, possibly resulting in personal
injury or death.
The fifth wheel plate must be kept well lubricated
with chassis grease to prevent friction and binding
between the tractor fifth wheel plate and the trailer.
For lubrication instructions, see Group 31 of the
Columbia
®
Maintenance Manual
.
Fontaine Fifth Wheels
General Information
The Fontaine sliding fifth wheel mount is designed to
provide optimum axle loading for maximum tractor
use with different lengths and types of trailers. The
sliding fifth wheel mount is used with the Fontaine
H5092 series fifth wheel and the Fontaine 6000/7000
No-Slack II series, and is equipped with either an
air-operated release slide (HAWB or AWB model), or
a manual release slide (HMWS or MWS model).
On Fontaine fifth wheels, kingpin release is accom-
plished by activating a manual lock control handle
located on either the right side or left side of the fifth
wheel. Kingpin lockup occurs when the kingpin is
forced into the jaws and the lock control handle
moves to the locked position.
The fifth wheel top plate is mounted on a slide as-
sembly, which is attached to slide rails that are
mounted on the vehicle frame. The slide rails permit
forward and rearward movement of the slide assem-
bly, allowing for optimum weight distribution over the
tractor axles.
Slots are evenly spaced along the slide rails, and
retractable tapered wedges are positioned through
the slots to hold the fifth wheel in the desired posi-
tion. See Fig. 10.14 or Fig. 10.15.
The slide portion of the sliding model may be at-
tached to either an air-operated release slide, or a
manual release slide.
The air-operated release slide contains an air cylin-
der that locks and unlocks the fifth wheel slide. See
Fig. 10.14. The air cylinder is activated by a two-
position air-control valve in the tractor cab.
The manual release slide contains a slide release
pull handle, located on the left side of the fifth wheel,
which locks or unlocks the fifth wheel slide. See
Fig. 10.15.
07/25/95
f310189
1
2
1. Locking Wedge 2. Air Cylinder
Fig. 10.14, Air-Operated Sliding Fifth Wheel Mount,
AWB Model
Fifth Wheels and Trailer Couplings
10.11
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