The deeper or more draft you want to put on the plow/tractor the lower you are required to lower the place on the quadrant where the touch control handle/lever is placed. As the plow is lifted the stress on the top link becomes less on the big draft spring and this in turn lets the pump tend to drop the plow to the preset position you have selected on the quadrant touch control handle. The lower you have the touch control handle set on the quadrant the more the big draft spring has to compress in order to push against the internal linkage that will try to make the control valve in the pump start to lift the plow. When the plow point engages the ground and the plow starts to try to rotate on the drawbar hook up pins at the ends of the lift arms the top link then begins to push in towards the back of the tractor and compresses the big spring on the lift housing. When the plow point tries to pull back on the tractor this is what the word "draft" means. When you let the lift down so that the plow touches the ground and begins to go into the ground the plow tends to rotate on the two points of the draw bar of the plow/implement. Thus it is called automatic draft control.ĭraft control is the automatic depth control of a ground engaging implement such as a turning plow or a cultivator. When a hard place in the ground is contacted the spring is compressed till it comes in contact with the linkage to the control rod and pushes the control valve in till the plow is raised to the point where the pressure on the big spring on the top link is slightly released thus letting the control rod move back toward the down position and stabilizing the draft of the plow. This is accomplished by being able to set the control valve link inside the lift closer or farther away from the plunger rod that is attached to the top link which is in turn attached to the top of the turning plow or cultivator linkage. He incorporated an automatic device that allowed you to set the amount of draft or pull on the plow and it would automatically raise the plow if a harder piece of soil was encountered with the plow or let it down a little if an easier place to pull the plow was encountered. He finally invented a hydraulic lift that had 3 points for attaching his specially built 3 point implements such as turning plows and cultivators. Harry Ferguson had been making and selling tractors for years in the early 30s. In Reply to: 8n draft control lever posted by jmck on Jat 09:46:53: As much box work as I am doing and will keep doing, if this thing is a great help, it would be worth while to learn how to use it.Posted by ZANE on Jat 14:21:45 from (64.12.116.145): So.does the draft control put down force on the arms to apply top force on the implement? In other words, is it like putting weight, or block on top of the implement to keep down force on it? The more draft you apply, the more force? Sorry to be so thick headed but I have played around with the thing and don't seem to get diff results. So,no I do not plow with a plow, but do alot with box scraper. (wish they made one that was automatic) I also use the FEL to take out say a big rise just before getting to a big dip in terain, then smooth it out with box scraper. I use the adjustment of the right rear arm to tilt the box on side hills to cut deeper on the top side. I use my box scraper to smooth, cut, dig, etc.
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