There are several different types and most all go for a constant speed. I have one on a 8100 Deere that I have used for planting that really works well as you plant in 12th gear and dial the cruise speed back till you are at 6 or 6.5 miles per hour and your engine is running about 16 or 1700 rpm. When you come to the end of the field you drop 3 gears, make your turn and hit the shift lever 3 times and your back up to planting speed and your tractor runs at about 2/3 throttle all day. That being said the new IVT transmissions are a whole new ballgame but accomplish about the same thing.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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