Roadside dump trucks A typical highway dump truck consists of a truck frame with a dump body affixed to it. The bed is raised using either a horizontal hydraulic ram and lever setup between the frame rails or a vertical hydraulic ram positioned under the front of the body, and the bed’s back is moveable at the back of the vehicle. The tailgate can be set up to swing upward on top hinges or in the “High Lift Tailgate” arrangement, where pneumatic rams raise the gate open and upward over the dump body.
Most standard dump trucks in the United States have one front steering axle and one, two, or three rear axles with dual wheels on each side. Tandem rear axles are almost always powered, and front steering axles are sometimes powered as well. Unpowered axles are commonly used to support the extra weight. Most unpowered rear axles can be lifted off the ground to reduce wear while the truck is empty or lightly loaded, and are commonly referred to as “lift axles.”
Roadless Dump Trucks Large construction vehicles known as “off-highway dump trucks” look nothing like highway dump trucks. Off-road mining and heavy dirt hauling jobs necessitate larger off-highway dump trucks. Rigid frames and articulating frames are the two different categories of frames. Neither the mining industry nor the companies that produce these machines frequently refer to their vehicles as “dump” trucks. In the US, the terms “haul truck” or “rock truck” are more applicable for this purely off-road automobile.
Haul trucks are utilized in sizable surface mines and quarries. They have a robust chassis, traditional steering, and rear-wheel drive. The Liebherr T 282B, Bucyrus MT6300AC, and Caterpillar 797F are the next-heaviest production haul trucks as of late 2013, with a combined weight of 450 metric tons, and they can each haul up to 400 short tons of payload. The majority of heavy haul trucks use diesel-electric drivetrains, which use the diesel engine to power an AC alternator or DC generator, which then transmits electricity to electric motors at each rear wheel. The Caterpillar 797 is exceptional for its size in that it utilizes a mechanical powertrain, which is used in road-going vehicles and intermediate-size haul trucks, to power a Diesel engine.
Articulated Dump Truck Off-road, all-wheel-drive dump trucks are known as articulated dump trucks. It is similar to a semi-trailer truck in that it has a hinge between the cab and the dump box, but it varies from one in that the power unit is a fixed component rather than a distinct vehicle. Hydraulic cylinders that pivot the entire tractor in relation to the trailer serve as the steering mechanism instead of rack and pinion steering on the front axle as in a typical dump truck. When steering in this way, the trailer’s wheels move in the same direction as the front wheels. Due to its low center of gravity and all-wheel drive, it can handle rocky terrain very well.
In the video below, we can see a Caterpillar 777 Mining Haul Truck being transported.
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Video resource: Big Rig Videos