Specifications include, but are not limited to: SNOW PLOW, REVERSIBLE FRONT-MOUNTED, CYLINDRICAL SHAPED The front plow shall be a power (or manual if so-specified) reversible, full trip type, designed for high speed highway snow plowing. The plow shall be not less than 10 feet long overall and not less than 36 inches high for light duty model; 11 feet long overall and not less than 36 inches high for medium duty model and not less than 11 feet long overall and 42 inches high for heavy duty model as defined elsewhere in this specification and designed for efficient, high speed highway snowplowing. Construction shall be of heavy steel members of such design and assembly to withstand severe service under adverse operating conditions. Weight of the complete reversible plow and drive frame assembly shall be approximately 1,500 to 2,500 lbs. (See section entitled "WEIGHT" for specific minimum weight requirements for light, medium and heavy-duty plows). MOLDBOARD – REVERSIBLE PLOWS The moldboard shall be fabricated minimum 10 U.S.S. gauge steel, brake formed, roll formed or paneled including a box brake at the top edge, and shall be stitch welded to a heavy steel framework of 5 or more full- height 1 piece vertical ribs (ribs shall mirror the shape of the moldboard at installed location), horizontal reinforcements and mounting brackets. If a 2-piece rib is provided, the rib thickness shall be a minimum 3/8” thick. Ribs are to be electronically welded utilizing a butt-weld or lap-weld process with maximum penetration on three sides of the joint utilizing metal-core welding wire. This intersection is to be designed and welded to withstand heavy forces incurred while plowing snow over the lifetime of the plow with zero failure rate. The contour shall be ideal for efficient discharge of heavy and light snow at highway speeds and shall extend forward at such an angle equal to or approaching the attack angle of cutting edge with pavement surface to prevent snow from blowing over the top. The design shall be proven under conditions of intended application or shall be subject to testing under actual use conditions by the Department of Transportation prior to acceptance. The bottom horizontal, cutting edge reinforcement shall be a minimum of a 5" x 3 1/2" x 5/8" or 4” x 4” x ¾” steel angle with a minimum of six (6) 3/8" steel gussets, continuously electrically welded to the moldboard framework on all 4 sides and designed to withstand severe shock of high speed contact with road obstructions. Bolt holes shall be spaced to accommodate the standard 12” carbide punch and standard 8” carbide punch. See attached sketches. Dimensional tolerance between hole spacing is +/- 1/16” (non-accumulative) from center to center across the full length of the mold board. The moldboard framework shall be provided with at least three (3), double shear hinge points with an outside spread of at least 80" for attachment to the drive frame assembly. A rubber snow deflector (15” wide X ½” thick) shall be mounted on the top edge, with a plastic or cable plow guide on each end that is a minimum length of 24”. DRIVE FRAME ASSEMBLY –REVERSIBLE PLOWS The snow plow push frame shall consist of two major components as follows: 1) an arc shaped member which shall be attached directly to the moldboard double shear hinge points with hardened steel pins: 2) a triangular shaped member which shall attach to the truck-mounted hitch assembly at two (2) points by double shear hinges with 1-1/4" diameter hardened steel pins located on 30-1/2" centers. The two members shall be joined by a minimum of 1-1/2” diameter hardened steel bolt, permitting the arc shaped member to swivel 12 degrees both left and right on the triangular shaped member. Means shall be provided to permit the plow to float as required to maintain contact with uneven road contours without transmitting torsional stress to the chassis frame. The tripping device shall be single full trip design that shall activate when the cutting edge comes into contact with a pavement obstruction. The pivot points of the tripping edge shall be grease-able. Trip activation shall be achieved through tension or compression springs and linkage system designed to permit adjustment of the cutting edge to ground plane angle and shall limit the tripping action to that deemed as necessary for safe and proper operation. For power reversible models, the reversing 36°(+/- 1°) mechanism shall be powered by two or more pistons, a minimum 3” in diameter with piston rods a minimum of 1 ½” in diameter, a nitrate or similar corrosive resistant coating, a double acting hydraulic ram capable of positioning the moldboard from bulldoze position to 36°(+/- 1°) left and right. An infinitely adjustable hydraulic system that will permit plowing at full range which is protected against shock loads by a cylinder protection relief valve and hoses mounted on the plow with provisions to pin plow at extreme left, extreme right and center. Plow angling shall be possible under all operating conditions. Two hydraulic hoses from the valve into the hitch into the truck couplers shall be 1/2” hose and fittings. All hydraulic hoses shall be located to prevent damage from the chains during all operating conditions. A crank type jack (2000 lb. load limit), removable without the use of tools, shall be attached to aid in mounting and dismounting of the plow. The angle of attack shall be a minimum of 65 (+/- 10°) degrees with telescopic brace in neutral position with the drive bar pins 17 inches above ground. Safety chains shall be attached to moldboard and drive frame to prevent moldboard from dropping when pin is sheared. The drive frame assembly shall be equipped with plow shoe mounting points for two vertically adjustable plow shoes with plow shoe assemblies being available for purchase separately. Said adjustability shall enable shoes to be set at infinite number of settings throughout the adjustment range utilizing slotted holes or other acceptable means. Shoe shall have a maximum rotation of 20° from horizontal. The drive frame assembly shall attach to the truck mounted hitch assembly at two points by double shear hinges with 1 1/4" diameter hardened steel plow pins with holes for 5/16" locking pins to secure plow pins in position. Push arms or drive arms shall have 1-1/4" holes.
