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After the war, Fruehauf introduced hydraulics in his trailers. They offered hydraulic lift gates, hydraulic winches and a dump trailer for sales in the early 1920s. Fruehauf became the premier supplier of dump trailers and their famed "bathtub dump" was considered to be the best by heavy haulers, road and mining construction firms. [3] [4] [5]
The permanently attached trailer can not move vertically in relation to the tractor, but can rotate and swing on the horizontal plane. The operator has a conventional steering wheel that actuates hydraulic cylinders that push and pull the tractor relative to the trailer. The tractor and the trailer sections can move at great angles to each ...
Tiiger four-axle HMT module at Transporter Industry International headquarters in Haryana, India. A hydraulic modular trailer (HMT) is a special platform trailer unit which feature swing axles, hydraulic suspension, independently steerable axles, two or more axle rows, compatible to join two or more units longitudinally and laterally and uses power pack unit (PPU) to steer and adjust height. [1]
M817 Dump truck. The M817 dump truck was used to haul sand, gravel, dirt, rubble, scrap, and other bulk materials. It had a 5 cubic yards (3.8 m 3) dump body with cab protector and a tailgate that could hinge at either the top or bottom. Normal loads are heavy by volume, the dump body was smaller and more heavily built than a cargo body.
A live bottom trailer is the alternative to a dump truck or an end dump trailer. The typical live bottom trailer has a conveyor belt on the bottom of the trailer tub that pushes the material out of the back of the trailer at a controlled pace. Unlike the conventional dump truck, the tub does not have to be raised to deposit the materials.
In the example above of the dump truck, the weight of the dump body, now raised at an angle of 60 degrees but empty of the load, must be enough to force the unpressurized hydraulic fluid out of the cylinder and cause it to retract to the fully collapsed position. [6] Spider lift set up outside a building.