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The dump truck is a truck used for transporting loose material, such as sand, dirt or gravel for construction. The dump truck is equipped with a hydraulically operated open-box bed hinged at the rear, the front of which can be lifted up to allow the contents to be deposited on the ground behind the truck at the site. A typical dump truck is equipped with a hydraulically operated open-box bed hinged at the rear, the front of which can be lifted up to allow the contents to be deposited on the ground behind the truck at the site of delivery.
The dump truck was first conceived in 1920 by a Mr Mawhinney when he attached to a dump box to a flat bed truck in The lifting device was a winch attached to a cable that fed over sheave (pulley) mounted on a mast behind the cab. The cable was connected to the lower front end of the wooden dump box which was attached by a pivot at the back of the truck frame. The operator turned a crank to raise and lower the box. Today,all dump trucks operate by hydraulics and they come in a variety of configurations each designed to accomplish a specific task in the construction material supplies.
→There are many types of Dump Trucks.→
The Standard Dump Truck
The standard dump truck is a full truck chassis with a dump body mounted to the frame. The dump body is raised by a hydraulic ram mounted forward of the front bulkhead, between the truck cab (traction unit) and the dump body called a semi-trailer. The tailgate can be configured to swing on hinges or it can be configured in the high lift tailgate format .
Transfer Dump Truck
A transfer dump is a standard dump truck which pulls a separate trailer which can also be loaded with aggregate such as gravel, sand, asphalt, snow, wood chips, etc.
Superdump Truck
A Superdump is a straight dump truck equipped with a trailing axle, a lift-able, load-bearing axle rated as high as 13,000 pounds. Trailing 11 to 13 feet behind the rear tandem, the trailing axle stretches the outer "bridge" measurement—the distance between the first and last axles—to the maximum overall length allowed. This increases the gross weight allowed under the federal bridge formula, which sets standards for truck size and weight. Depending on the vehicle length and axle configuration, Superdumps can be rated as high as 80,000 pounds GVW and carry 26 tons of payload or more. When the truck is empty or ready to offload, the trailing axle toggles up off the road surface on two hydraulic arms to clear the rear of the vehicle. Truck owners call their trailing axle-equipped trucks Superdumps because they far exceed the payload, productivity, and return on investment of a conventional dump truck.
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