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English: Diagram showing a side view and underside of a conventional 18-wheeler semi-trailer truck with an enclosed cargo space. The underside view shows the arrangement of the 18 tires (wheels). Shown in blue in the underside view are the axles, drive shaft, and differentials. The legend for labeled parts of the truck is as follows: tractor unit
A tandem axle is a group of two or more axles situated close together. Truck designs use such a configuration to provide a greater weight capacity than a single axle. Semi-trailers usually have a tandem axle at the rear. Axles are typically made from SAE grade 41xx steel or SAE grade 10xx steel.
Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...
The TerraPro is a forward control cab-over-engine with a low cab in front of the axle. This allows very tight turning radius for the overall length of the truck. The low cab also lets a boom operate over it. There is an available right-side driving position. Commonly a 6x4 (3 axles, 2 powered) tandem steer front and extra lift axles are available.
For trailers, the purpose is to bear heavier loads than a single axle provides. In heavy trucks, tandem refers to two closely spaced axles. Legally defined by the distance between the axles (up to 2.5 m (8 ft 2 + 3 ⁄ 8 in) in the European Union, 40–96 inches (1.02–2.44 m) in the United States), mechanically there are many configurations ...
The tractor and the trailer sections can move at great angles to each other making for a small turning radius. The trailer axle(s) are driven by a drive shaft exiting the rear of the transmission with splines and universal joints to accommodate the movement between them. All axles are portals with hub reduction and locking differentials ...
Variants with a C suffix (such as M35A2C or M36A2C) featured a straight drop-side cargo bed. M44, M45, and M46 simply designated the long single tandem, long double tandem, and extra long double tandem chassis for the M35 2 + 1 ⁄ 2-ton series of trucks; there was also a short tandem chassis without an M designation. These cab/chassis would ...
Increased axle lengths beyond these do not increase maximum legal weight. [11] 6 __ Exception to the formula: when the four axles under consideration are two tandem axles spaced at least 36 feet (10.97 m) apart, a gross weight of 68,000 pounds (30,844 kg) is allowed. [11] __ Upper blank areas represent unrealistic configurations. [4]