The lift arms extend rearward, and are the pull-point for the implement.
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The center top link is movable, but usually not powered by a tractor's hydraulic system. This point of attachment is the third mounting point, and it also extends rearward from a top middle position at the rear of the tractor. Comparatively very little rearward force is applied from the top link unless the implement becomes bound up or twisted in some way. The top link often has a manual adjustment to achieve an optimum angle of attachment between the tractor and the implement.
The primary benefit of the 3-point hitch system is to transfer weight and stress of an implement to the rear wheels of a tractor.
3-Point Tractor Attachments
Larger implements require a corresponding larger-sized tractor with 3-point hitch specifications grouped in 5 different categories. There are 5 different hitch sizes, called categories. The higher category hitches have sturdier lift arms and larger connector pins. There is some flexibility in the tractor hp at which one category hitch ends and the next begins. The distance from the tail of the PTO shaft to the lift arm ends is approximately 14 inches.
The minimum spread between the lower lift arms will be about inches, the maximum spread is normally out to 33 inches or more. Harry Ferguson patented the 3-point 'linkage', also called the "Ferguson System", for agricultural tractors in Britain in It enabled the operator to simply back up to the implement, connect, and lift. His credit is not for the invention of the device, but in the realization of the significance of having a rigid attachment of a plow to the tractor. Ferguson developed a number of improvements to this device, such as the hydraulic lift, which made this system desirable to the point of using it on commonly sold tractors, starting with the Ford 9N.
Prior the s, each manufacturer used their own hitching systems for attaching implements to their tractors. 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 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. This gives the tractor more usable traction than it would otherwise have, given the same power , weight , and fuel consumption.
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For example, when the Ford 9N introduced Harry Ferguson 's three-point hitch design to American production-model tractors in , it was a light and affordable tractor competing principally with row-crop tractors such as Farmalls that did not yet have three-point hitches. The three-point hitch is made up of several components working together. These include the tractor's hydraulic system, attaching points, the lifting arms, and stabilizers.
Three-point hitches are composed of three movable arms. The two lower arms—the hitch lifting arms—are controlled by the hydraulic system, and provide lifting, lowering, and even tilting to the arms. The upper center arm—called the top link—is movable, but is usually not powered by the tractor's hydraulic system.
3-Point Tractor Attachments
Each arm has an attachment device to connect implements to the hitch. Each hitch has attachment holes for attaching implements, and the implement has posts that fit through the holes. The implement is secured by placing a pin on the ends of the posts.
The hitch lifting arms are powered by the tractor's own hydraulic system. The hydraulic system is controlled by the operator, and usually a variety of settings are available. A draft control mechanism is often present in modern three-point hitch systems. The draft of the implement, the amount of force it is taking to pull the implement, is sensed on the lower arms and the hydraulic system automatically raises the arms slightly when the draft increases and lowers the arms when the draft decreases.
There are five different hitch sizes, called categories. The higher category hitches have sturdier lift arms and larger connector pins. Before the s, most hitching of farm implements to tractors was done simply with a drawbar , on the same principle as a modern tow hitch.
3 Point Hitch Attachments
The drawbar was a flat bar with holes in it, and the implements were trailers, with tongues that attached to the drawbar with a pin through a hole. Again this hitch is a Cat 0. I also have the Cat 1 hitches in my other item. Ship in 24 hours! The unique bottom pin design makes it easy to use with smaller tractors like the BX Kubota. Heavy duty steel construction for durabilit Quick Hitch Cat 1.
Three Point Hitch Components
The unique bottom pin design makes it easy to use with smaller tractors like the BX Kubota,L Kubota. Works on all 3 point Cat 1 Tractors.
Fits most tractors 15 to 40 HP. Chains may be gold or silver in color. This Compact Receiver Trailer Hitch is made of structural steel that is laser cut and fully welded. Distance between Lower Arms: