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I believe in setting the concave to a wedge, go for 3/8 - 1/2" open in front
and pull the rear hangers to closed in the back. I used a spacer to do the
clearance in the front, and with the cylinder in free wheel, carefully use
a feeler gauge to get both sides adjusted the same in the back.

Important for wheat especially, so you can thresh up front push it through the
concave, so you don't put it up on the walkers.

We did this for many years, with several JD conventionals. You can read about
this on the Harvest Services website.
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