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The fifth wheel on a tractor unit, rear view Fifth wheel on the bottom of the trailer A fifth wheel, already coupled, side view. The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly.
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 ...
A fifth-wheel coupling with an integrated lifting mechanism allows the semi-trailer's legs to remain in the lowered position during movement. 380 millimetres (15 in) and 32,000 kg (71,000 lb) of hydraulic lift is typical. A rear window to create a 360-degree view
The towing vehicle has a wide coupling plate known as a fifth-wheel coupling bolted onto its chassis, on which the semi-trailer rests and pivots. As the tractor reverses under the trailer, a kingpin under the front of the trailer slides into a slot in the skid plate, and the jaws of the fifth wheel close onto it.
The front axle was an I-beam, the rear was a double reduction full floating type. International used their own front and rear axles, Kenworth and Marmon-Herrington used Timkens. Brakes were full air with drum brakes on all wheels. Trailer brakes could be used independently of the tractor. A disk type hand brake was mounted on the propeller shaft.
RoadRailers were a trailer or semi-trailer that could be hauled on roads by a tractor unit and then by way of a fifth wheel coupling, operate in a unit train on railway lines. The RoadRailer system allowed trailers to be pulled by locomotives without the use of flatcars, instead attaching trailers directly to bogies.
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