Combines 9500 concave proportioning

The concave basically is supposed to sit in there even. If you mark one of the cylinder bars, then take a piece of flat steel and stick it in all four holes on the sides between your marked bar and the concave, set your concave so your piece of flat still slides in and out. Now you have the same gap on all four corners of your concave and know it's square to the cylinder

the factory setting is 3_16 on all four sides there should be a washer on one clinder bar one each end and this is the bar you check with

Do you know why this is different from the older combinesIJ I believe on the old ones the dimension was 1_4 at the front and 1_8 at the back which makes sense to me. You would think in harder threshing crops if it wasn't knocked out in the front area and it got closer towards the back it would be a better job of threshing.

older combines had the pinch point in the rear, or last bars of the concave. the newer (9000 up) have the pinch point between the two inspection windows. the crop mat is thrashed hardest in the center, and then is allowed to "fluff up" a bit in the back half of the concave to help seeds release from the crop mat.