than 7 gage (4.554 mm) (0.1793
right hand cast and left hand
inch) high tensile steel or a one
cast. A shear pin shall be used
piece (not spliced) sheet of 9.5
to lock the snowplow in any of
mm
(0.375
inch)
thick
its five plowing positions. Under
polyethylene material.
The
normal plowing conditions, the
polyethylene material shall not
shear pin shall be designed to
become brittle in temperatures
minimize
damage
to
the
as low as -54°F), shall not
snowplow and vehicle should
corrode, and shall have an
the snowplow's leading edge
abrasion resistance factor at
come into contact with an
least equivalent to steel.
A
immovable object.
snow deflector shall be provided
The plow hitch shall be of the
the full length of the top of the
push-frame type designed to be
moldboard. The snow deflector
attached to and transmit the
shall be of the manufacturer's
entire plowing thrust to the truck
standard design to prevent snow
frame in such a manner that no
from topping the snowplow. The
plowing thrust shall be absorbed
snowplow shall be equipped
by the truck front axle. Front
with two heavy duty steel
axle hitch supports, when used,
casting, full swivel shoes or tow
shall be attached in a manner to
caster wheels for classes B
prevent
chafing
or
other
through E. Class F and G shall
damage.
Hitch mainframe
be equipped with two heavy duty
members and lift frame vertical
410 mm (16 inches) full swivel
and horizontal members shall be
caster wheels with pneumatic
of adequate size, properly
tires. Both the caster wheels
braced, and reinforced to
and swivel shoes shall be
sustain the loads imposed under
adjustable. The caster wheels
severe operating conditions.
shall be roller or ball bearing
The hitch shall be removable.
mounted, shall be of the
The hydraulic system shall
shielded
type
to
prevent
consist of a power operated
entrance of water and foreign
pumping unit, a hydraulic fluid
matter,
and
shall
have
reservoir or a reservoir integral
lubrication fittings.
with the hoist, controls, cylinder,
The push-frame assembly shall
hoses, piping, and all other parts
attach to the moldboard and
essential for normal operation.
hitch in a manner to provide
The hydraulic system shall
ample road clearance of the
comply with the requirements in
assembly and permit sufficient
paragraph 3.1.1.10. Controls to
oscillation for the snowplow to
the pumping unit shall be
follow road contour and clear
operable by the truck driver in
snow evenly. The positioning of
his normal operating position
the snowplow moldboard to the
and shall not interfere with the
right and to the left shall be of
operation of any truck controls.
the manual angling type and
The hydraulic pump shall be
shall be capable of being
powered
by
the
engine
accomplished by one man
crankshaft
or
transmission
without the use of tools. The
mounted PTO. The snowplow
snowplow shall have a minimum
hoist
cylinder
shall
have
of two angle adjustments both to
sufficient travel to hoist the plow
Page 55 of 79
to verify that this 7 4Y
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