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The Mk3 FV12004 was a tractor for semi-trailer with a 3 1/2" pin oscillating fifth wheel to give it limited cross country ability. The Mk3A FV12006 was introduced because the Army had large numbers of Dyson FV3601 full trailers. The Mk3A retained the fifth wheel, but had a readily dismountable steel-framed, wooden Ballast Body.
Timberjack was founded in Woodstock, Ontario, in the 1950s by Wes Magill and Robert Simmons, who designed an articulated four-wheel drive tractor with a winch at the back. They produced a prototype and production took off from there.
Theoretically, this was a guaranteed way to prevent jackknifing; however, frequent use of the trailer brakes alone caused them to overheat and fade while the tractor brakes remained fresh. In the event of an emergency stop , the driver, applying the foot brake, could cause the trailer to jackknife because the tractor brakes lock while the ...
The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin , a 2-or- 3 + 1 ⁄ 2 -inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a ...
A fifth-wheel coupling is also referred to as a kingpin hitch and is a smaller version of the semi-trailer "fifth wheel". Though a fifth wheel and a gooseneck trailer look much the same, their method for coupling is different. A fifth wheel uses a large horseshoe-shaped coupling device mounted 1 foot (0.30 m) or more above the bed of the tow ...
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 ...