The 3 point linkage system was patented in the UK by Harry Ferguson in 1926, this was known as ‘the Ferguson System’ and included a range of purpose built agricultural implements. Powered by the hydraulic system and controlled by the driver, the lower lift arms are the only powered part of the 3 point linkage, designed to lift and lower any implement attached to them. The lower lift arms are two rigid bars with ball joints each end. Manual top links have an adjustable shaft with a ‘ball’ end – one end is attached to the tractor and the other to the implement. Hydraulic top links are common on large machines, these allow adjustments to be made with ease at the touch of a button! The top link is rigid and is designed to set the operating angle alignment of the implement. Stabilisers can be fitted and adjusted to reduce implement ‘sway’, normally to avoid the implement fouling the tyres when traveling. The orientation of the implement can be altered longitudinally by adjusting the ‘levelling box’ and laterally by adjusting the top link. A stone or root is met by a ground engaging implement. Draft control is a system that adjusts depth automatically when resistance, eg. ![]() In most instances, the top link will also actuate the tractors built in ‘draft control’. ![]() Three point linkage systems are designed to shift the weight of the implement, such as a plough, to the tractor providing the tractor more traction. The top link (upper centre arm) is adjustable in length to allow the attachment to run at the desired level. They comprise of three movable arms assembled in a triangle or ‘A’ formation, and are controlled by the hydraulic system allowing lifting, lowering and tilting. There are some people at who probably do a better job of explaining this.Three point linkage (or three-point-hitch) is a standardised system to attach implements to tractors. What keeps the mower on the ground is the weight of the implement, and lack of up pressure from the position control. What keeps the plow in the ground is a combination of how it is set, and the weight of the implement. Remember, the 3ph has no downward pressure. It doesn't need to be rigid, either, so set the pins so there is "just a little" lateral play.īy the way, the "float" position would be with the draft control out of the picture, and the position control all the way down, or almost all the way, anyhow. That mower is a heavy piece of equipment, and when it shifts suddenly from one extreme to the other, it creates quite some momentum. It doesn't need to have free movement, because that can put some heavy loads on the arms and chains, possibly doing some damage. You need to use the pins to adjust the mower so it has just a little latarel movement. You said you had the up/down adjustment pretty well under control, anyhow. On some older Ford tractors, there is actually a lever on the transmission cover that is changed back and forth when changing from a plow to a mower. When using an implement that does not engage the soil, like your bush hog, the draft lever is placed (I think) all the way down, and the position control is used to set the height of the mower. They are used in conjunction with each other when plowing. Your tractor probably has two levers controlling up and down on the 3ph, a "draft" lever and a "position control" lever. Harry Ferguson invented it, and Henry Ford stole it after their infamous "handshake" deal. A valve in the top (center) link senses when increased down pressure is applied as the plow is "sucked" into the ground and corrects by applying up pressure, theoretically maintaining a consistent depth no matter if the soil is hard or soft. Draft is only for soil engaging implements, like bottom plows and chisel plows. Your tractor manual will tell you how to use the draft/position control. ![]() I have two more options, pinning it down so it can't go anywhere, or putting it in a position that lets it go back and forth a couple inches instead of several like leaving them out does. What's happening is that I can sometimes miss big strips of vegetation even though it ought to be overlapping so apparently leaving the pins out is wrong. Yeah but like I said in the previous response, it's not the levelness that I'm concerned with, just not sure what to do on the side to side action. Basically if you're disking along and your disk gets hung in the muck, instead of vainly chugging along at the same rate, your top link senses this, and the lift arms lift up so your disk doesn't dig as deep. ![]() It was made for things like disking, and basically saves fuel more than anything else, probably keeps you from getting hung up and saving time as well. Ford invented it, the top link does something to a valve when extra pressure is put on it, and it in turns lifts the lift arms. I think that's what is called the draft control and is different than the float.
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