I think Yetter made the first disk coulter and they used a standard 16" disk blade. The arm the coulter mounts on is bolted rigid to the shank and that is a must. Will not work if loose. To start adjustment you use the turn of the offset in the shank to get the angle of the mounting arm, then the hub is bolted to that arm with 3 bolts, middle is a round hole, other 2 are slotted so it can be twisted to get perfect alignment. That does the job a jointer was supposed to do but didn't. It keeps the trash from building up on front side of beam.I think it was Tractor Supply that one time sold a disk blade type of coulter that had a spring to hold it in alignment bu if you hit a rock it would give some to pass the rock through, the Yetter rigid would not do that and you would have to beat the rock out. I have had to do that many a time. I think the Yetter coulters came out in late 40's, I know Dad had them before I was old enough to drive the tractor and I was born in 1943. The only plows we did not have them on was a Deere 3 bottom mounted sold new with a 2020 tractor and a 4 bottom Massey Ferguson semi-mounted. Had them on multiple 2 and 3 bottom plows before in both 3 pt and drag type. Lentz made a 2 flat blade coulter to do the same thing with one blade set as a standard factory coulter when working but had a second coulter set at an angle that did the same thing as the concave part on the disk blade unit. There were I think other makers of those disk blade type of coulters but I do not know anything about them. That spring loaded that I think was TSC the center of the blade mounted different so was not easy to replace a dammaged blade like the Yetter was. Had the Yetter coulters on at least 5 plows at the same time. And still have several laying around yet altho no longer farming. And I did have a chisel plow for a time and when was no longer farming a highly eroadable farm sold it as I did not like the work they do.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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