The hitch lifting arms are powered by the tractor's own hydraulic system. The implement is secured by placing a pin on the ends of the posts. Each arm has an attachment device to connect implements to the hitch.Įach hitch has attachment holes for attaching implements, and the implement has posts that fit through the holes. The upper center arm-called the top link-is movable, but is usually not powered by the tractor's hydraulic system. The two lower arms-the hitch lifting arms-are controlled by the hydraulic system, and provide lifting, lowering, and even tilting to the arms. Three-point hitches are composed of three movable arms. These include the tractor's hydraulic system, attaching points, the lifting arms, and stabilizers. The three-point hitch is made up of several components working together. The grey bars are a separate implement (a towing ball hitch) attached to the linkage. The tractor and linkage are painted gold. The hitch's utility and simplicity have since made it an industry standard.Ĭomponents Three-point linkage on a Ferguson 35 tractor. At 2,500 pounds (1.1 t), the 9N could plow more than 12 acres (4.9 hectares) in a normal day pulling two 14-inch (360 mm) plows, outperforming the tractive performance of the heavier and more expensive Farmall F-30 model. For example, when the Ford 9N introduced Harry Ferguson's three-point hitch design to American production-model tractors in 1939, it was a light and affordable tractor competing principally with row-crop tractors such as Farmalls that did not yet have three-point hitches. This gives the tractor more usable traction than it would otherwise have, given the same power, weight, and fuel consumption. The primary benefit of the three-point hitch system is to transfer the weight and resistance of an implement to the drive wheels of the tractor. The other main mechanism for attaching a load is through a drawbar, a single point, pivoting attachment where the implement or trailer is not in a fixed position with respect to the tractor. The tractor carries some or all of the weight of the implement. Three-point attachment is the simplest and the only statically determinate way of joining two bodies in engineering.Ī three-point hitch attaches the implement to the tractor so that the orientation of the implement is fixed with respect to the tractor and the arm position of the hitch. The three points resemble either a triangle, or the letter A. The three-point hitch ( British English: three-point linkage) is a widely used type of hitch for attaching ploughs and other implements to an agricultural or industrial tractor. Hitch for attaching implements to tractors Ursus C-360 tractor and mowing deck, attached by a three-point linkage and driven by a PTO shaft
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