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Technical Specifications for
Harder Dump Box Spreader

Certain features protected by
U.S. Patent No. 4,685,619
Canadian Patenet No. 1243337

  1. The Spreader Unit shall be designed to utilize a standard Truck Tilting Dump Box Body as the reservoir for materials to be spread.
  2. The Spreader Unit shall be installed in the Dump Box and extend through a Central (Coal) Door in the Pivoting Tailgate. The Spreader Unit’s only attachment to the Body shall be by means of two pivot points located near the bottom edge of the Tailgate.
  3. The Spreader Unit shall be of a design such that the Dump Box can be emptied while the Spreader Unit remains installed in the Dump Box. During Dump Box emptying, Spreader Unit mounting shall be designed to raise Spreader Frame off floor of Dump Box at Tailgate to allow cleaning under Spreader Unit.
  4. A companion Tailgate Door "Kit" shall be provided with the Unit for installation in the Tailgate of the Dump Box. The Tailgate Kit shall have a 1/4 in. formed plate frame with a 3/8 x 3 bar which extends across the lower edge of the Tailgate opening. Kit shall include a "Summer Door" and a "Winter Door". Door Operator Handle shall have a deformed tubular shape for operator comfort and strength. Door to be retained in the Frame by 1 in. sq. guide on both sides. Door to be secured from sliding open or closed by a stainless clamp screw.
  5. The Spreader Unit Frame Side Rails and Slider Bed shall be of 1/4 inch steel plate. Cross section dimensions shall be 22 in. wide and 9 1/2 in. max. high. Max. overall length of the Spreader Unit shall be 14 ft. 6 in. with 27 in. max. extending behind the Tailgate.
  6. The Spreader Unit Conveyor Tailshaft Assembly shall be located at the end of the unit installed inside the Dump Box Body. The Tailshaft shall be bolted into the Frame. Idler Sprockets shall roll on the Tailshaft and shall be of a design which does not require lubrication. Access to Conveyor Chain Connecting Links shall be by removal of a Heavy-duty Access Cover located to expose the Tailshaft Assembly.
  7. The Spreader Unit Conveyor Drive Assembly shall be built on a separate Sliding Drive Frame designed to slide atop the Spreader Unit Frame Side Rails. The Sliding Drive Frame shall be of 1/4 in. steel plate and shall slide on 3/16 inch thick Stainless Steel rails welded to the Spreader Unit Frame Side Rails. The Conveyor Headshaft Bearings and Gearbox shall be mounted to the Sliding Drive Frame. Headshaft Bearings shall be Four-hole Ball Bearing Flange type. The Conveyor Headshaft shall be 2 inch diam. steel secured into a heavy duty, cast iron, Worm-type Gearbox (Durstâ ). Gearbox shall be powered by a Hydraulic Motor (Char-Lynnâ ).
  8. The Spreader Unit Conveyor Chain shall be of heavy duty, Flighted Pintle Chain. Pintle Chain Sideplates shall be .170 inches thick. Flights shall be of 3/8 inch x 1 1/4 inch steel flat with upset ends welded top and bottom to every other chain link.
  9. The Spreader Unit Conveyor Chain Tension shall be adjustable by means of Grease (hydraulic) Cylinders located on either side of the Sliding Drive Frame. Grease Cylinders shall be designed to push Sliding Drive Frame along Conveyor Side Rails and away from Tailshaft end of Unit in order to tension Conveyor Chain. Working length of Conveyor Chain shall be adjustable 3 inches from12 ft. 8 in.
  10. The Spreader Unit shall be designed such that material to be spread is conveyed to the rear of the Dump Box, through the Tailgate Door, dropped between the Deflector Panels and onto a Spinner Disc. Deflector Panels shall be mounted to the Drive Frame. A Swivel Mechanism with a telescopic Spinner Arm Assembly shall be mounted to the Drive Frame. For Stowing when not in operation, the Spinner Arm Assembly shall swing 90 degrees clockwise from the Spreading Position. Spinner Arm Assembly shall latch in either position. Spinner Disc shall be a Finned Urethane Disc powered by a Hydraulic Motor (Char-Lynnâ ) independently of Conveyor Drive. Dispersion by the Spinner Disc shall be controlled by adjustable Deflector Panels located below the Conveyor Discharge and above The Spinner Disc and by a cylindrical rubber skirt suspended from the Discharge Hopper on four adjustable chains.
  11. All Spreader Unit Fasteners shall be of Stainless Steel.

    12. Harder Spreader Home | For Larger Trucks | For Smaller Trucks | Specifications | Contact Us

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or phone 1-888-946-9202
or fax 1-315-946-6622

  Certain features protected by
U.S. Patent No. 4,685,619
Canadian Patent No. 1243337

Manufactured by LaGasse Iron Works
 52 Elmer St. Lyons, New York 14489

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