3.1.1.4
TOWING DEVICES.
3.1.1.7
6X6 CONVERSION.
Towing devices consisting of two hooks,
The chassis manufacturer's standard 6x4
loops, eyes or pins or the chassis
truck chassis may be modified to provide
manufacturer's standard single center
all-wheel drive conforming to the
mounted eye or pin shall be mounted on
requirements specified herein if:
the front of the vehicle. All towing devices
(a) The conversion axle manufacturer
shall be frame rail mounted or reinforced
specifically approves and certifies
back to each frame rail.
that all such modifications meet the
design requirements and standards
3.1.1.5
WHEEL SPLASH AND STONE
of the conversion axle manufacturer.
THROW PROTECTION.
Certification shall be based on both
Type III stakes and Type IV dumps shall
design analysis and proving ground
have rubber mud flaps to the rear of the
test reports.
rear wheels. Type II tractors shall have
rigid quarter fenders to the front of the
(b) The chassis manufacturer's front axle
rear wheels and rubber mud flaps to the
rating before conversion is not
rear of the rear wheels. Tractor mud flaps
exceeded by the conversion axle to
and their extension supports shall be
be installed.
readily removable, to increase landing
(c) Components used in the all-wheel
wheel clearance, without the use of hand
drive conversion are of current
tools. A metal strip not less than 3.2 mm
production.
(0.125 in) thick and not less than 25 mm
(1 in) wide, extending the entire width of
(d) Components used in the all-wheel
the mud flap, shall be installed to prevent
drive conversion are approved for the
the bolt heads or bolt nuts from damaging
conversion
application
by
the
the mud flap. As an alternate method of
component manufacturers.
attaching the mud flaps, tabs or clips with
(e) The converted vehicle is certified to
minimum surface contact dimensions of
conform to Federal Motor Vehicle
25 mm (1 in) high by 32 mm (1.25 in) wide
Safety Standard No. 121 by the
by 2.4 mm (0.094 in) thick shall be
intermediate or final manufacturer.
furnished at each bolt. All tilt cabs shall
(f)
Replacement headlights, if required
have rubber mud flaps to the rear of the
to be added, shall meet the height
front wheels. All splash shield and mud
requirement of not less than 560 mm
flap installations, front and rear, shall
(22 inches) and not more than 1370
conform to the rear splash and stone
mm (54 inches), measured above the
throw protection provisions of SAE J682.
road surface, in conformance with
The quarter fenders on tractors need
Federal
Motor
Vehicle
Safety
extend down only to the height of the
Standard No. 108.
Replacement
centerline of the rear axle. Splash shields
headlights shall be equivalent in
shall have no advertising or logos, except
mounting, protection, range and
that of chassis or body manufacturer.
precision of adjustment to the chassis
3.1.1.6
BRUSH GUARD.
manufacturer's
original
standard
6x6 vehicles shall be equipped with a
headlights.
radiator and headlamp brush guard.
(g) Unused headlight cavities are
When the headlamps are recessed into
covered in a neat workmanlike
and protected by the front bumper, a
manner, treated and painted to match
headlamp brush guard is not required.
the chassis cab color with treatment
and painting equivalent to the chassis
Federal Standard 807M
Page 8 of 65
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