Figure 4
3.5.2.1
FIFTH WHEEL LOCATION.
The location of the fifth wheel, unless
Cab-Trunnion (CA)
otherwise specified, shall load both front
CODE
LENGTHS
MAXIMUM
and rear axle assemblies
to their
(for fixed body) (select
BODY SIZE
maximum rating simultaneously.
The
one)
CABF
210/220 cm (83/84 in)
3.6 m/12 ft
clearance from the centerline of the
CABJ
260/270 cm (101/108 in)
4.3 m/14 ft
kingpin to the cab, or to the vertical spare
CABM
300/320 cm (119/124 in.)
4.9 m/16 ft
tire assembly when furnished, or pogo
CABP
340/360 cm (136/138 in)
5.5 m/18 ft
CABQ
360/370 cm (138/142 in)
5.5 m/18 ft
stick type hose tender when furnished,
CABT
380/400 cm (150/156 in)
6 m/20 ft
shall be not less than 1620 mm (64
CABW
420/440 cm (167/171 in)
6.6 m/22 ft
inches). When additional equipment to be
Specify as needed when other than types covered by
mounted behind the cab is specified, the
Figure 4.
1620 mm (64 inches) shall be measured
3.5.2
TYPE II (TRUCK TRACTOR).
to the rearmost point of a pogo stick to be
Type II tractors shall conform to 3.5.2.1
mounted behind the additional equipment.
through 3.5.2.6 with the fifth wheel
The CT dimension may be increased.
mounted on an adjustable sliding base.
Sliding fifth wheels shall be mounted with
Unless otherwise specified, Type II
the rear most position dead center of the
tractors shall be equipped with a fore and
tandem axle trunnion or tandem load
aft rocking, 910 mm (36 inch) diameter air
equalization point.
slide fifth wheel with forks and
semiautomatic lock for SAE J700 kingpin.
3.5.2.2
FIFTH WHEEL MOUNTING.
The fifth wheel shall be mounted on an
Fifth wheel mounting shall conform to
adjustable sliding base. The slide locks
Federal Motor Carrier Safety Regulation
shall be of the air release type with
393.70(b).
controls mounted on the instrument panel.
3.5.2.3
FIFTH WHEEL HEIGHT.
The fifth wheel shall have an adjustment
The unladen level height of the fifth wheel
range of not less than 580 mm (23 inches)
shall be 1219 mm (48 inches), plus or
with adjustment increments of not more
minus 25 mm (1 inch), above ground
than 100 mm (4 inches). For safety, the
level..
actuating button in the cab shall be
interlocked with trailer parking brake.
3.5.2.4
RESERVED
The fifth wheel shall be capable of being
uncoupled by the operator standing on the
driver's side of the vehicle. Uncoupling
3.5.2.5 DECK PLATE.
action shall be protected by a secondary
A self-cleaning grating of sufficient
manual lock, preventing movement of the
structural strength for use by the operator
uncoupling lever until the secondary lock
in connecting air and electric lines
is manually released. The fifth wheel
between the tractor and a semitrailer shall
shall have a visual indicator or latching
be installed. The grating shall extend
mechanism to ensure a positive lock of
across and shall be bolted or clamped to
the kingpin. The vertical load capacity
the frame rails.
Grab handle(s) and
and the drawbar pull capacity of the fifth
step(s), to allow safe access to personnel
wheel shall be not less than the loads
climbing onto the deck plate, shall be
imposed with the vehicle loaded to the
furnished.
The grating shall be a
required GVW and GCW.
minimum of 101 CM (40 IN) and the front
edge shall be located as close to the cab
as possible and shall extend toward the
rear of the vehicle. Access through the
Federal Standard 807M
Page 23 of 65
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