Your cylinder speed is too fast,or the cylinder to concave os too close.For corn,the gap should be approx 5/8 at rear,wide open at front(approx 1 1/4").Cylinder speed should approx. 450rpm.For your combine,swap grain sprockets to give 437 rpm.That is the large 42 tooth on cylinder,27 tooth on the beater shaft.You reall should order a book!!There too many things to 'wing it'.ecpeacially for a 'newby'(no offence intended)Your JD dealer can get you one.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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