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A wheel would be placed on the rear frame section of the truck, which at the time had only four wheels, making the additional wheel the "fifth wheel". The trailer needed to be raised so that the trailer's pin would be able to drop into the central hole of the fifth wheel.
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.
On tanks and armoured vehicles, grousers are usually pads attached to the tracks; but on construction vehicles they may take the form of flat plates or bars. [ 1 ] Similar traction-improving patterns have been implemented on the surface of the wheels on tractors.
The M1000 has 40 wheels (215/75R 17.5 tires) across five axle lines, these with two half-width axles per line. Each axle has hydraulic pendular suspension, providing a 254 mm stroke, with lateral oscillation accommodating surface undulations. A hydraulic suspension system is provided on the pivoting gooseneck to equalise fifth wheel loads. The ...
Introduction of helical gears in transmission (2nd-5th). 2007 Fuel injection replaces carburetion on all models. 2008 front axle enlarged from 3/4 inch to 25 mm, rear axle decreased from 1 inch (25.4 mm) to 25 mm; 2009 "One size fits all" front mudguard approach replaced by improved mudguard contour to match each model's respective wheel diameters.
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