frame rail, with the fifth wheel in
The air lift fifth wheel shall
its lowest position, shall be not
include the following:
more than 1620 mm (64 inches)
(a) Additional air reservoir
for classes A, B and C vehicles,
tank(s), not less than 210 L
and also not less than 1400 mm
(7.4 cubic feet) total
(55 inches) for class C truck
capacity, equipped with
tractor. The unlined level height
drain, safety and check
from ground level to the top of
valves
between
the fifth wheel plate shall be
compressor and tank
1370 mm (54 inches) plus or
(b) Automatic
moisture
minus 25 mm (1 inch). With the
ejection valve
fifth wheel in its lowest position,
the vertical centerline of the fifth
(c) Two air starter valves to
wheel shall be not less than 200
emit and expel air from the
mm (8 inches) forward of the
reservoir tank to the air
centerline of the rear axle.
bellows
(d) Three-way
valve,
for
AICE
CHAINS-TIRE-AUTOMATIC
raising, lowering, or holding
When code AICE is specified,
the fifth wheel in all desired
the vehicle shall be equipped
positions. The valve shall
with automatic tire chains on the
be mounted on the truck
rear axle.
This option is
tractor instrument panel in
available only on vehicles with
a location accessible to the
air brakes. The chains shall be
seated driver driving.
permanently mounted to the rear
suspension. Controls to engage
(e) Snubbers
to
eliminate
and disengage the chains shall
spring deflection
be located in the cab, and be
(f)
Pneumatic system to open
easily accessible to the seated
and lock the SAE J700
driver. Activation of the chains
kingpin, operable from the
shall be accomplished without
truck tractor instrument
stopping the vehicle, to enhance
panel.
braking and traction in forward
and reverse speeds.
When
The air lift fifth wheel shall be of
activated the chains shall
the fore and aft rocking type,
provide improved traction under
with a 910 mm (36 inch)
tires
on
the
rear
axle.
diameter cast steel coupler plate
Installation of the chains shall be
with beveled approach forks.
in
accordance
with
the
The fifth wheel mounting shall
application requirements of the
conform to Federal Motor
manufacturer of the automatic
Carrier
Safety
Regulation
tire chains.
393.70(b).
The air lift fifth wheel clearance,
AL
ALUMINUM UTILITY BODY
measured from the centerline of
When code AL is specified, the
the kingpin to the cab or pogo
maintenance/line body shall be
stick, shall be not less than 1620
constructed of aluminum with
mm (64 inches). The landing
strength equal to specified steel.
wheel clearance to the vertical
plane at the outside edge of the
rearmost tire and the chassis
Page 35 of 79
to verify that this 7 4Y
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