GR, Instead of the blanket term walker losses, let's call them excessive walker losses. The Deere performance enhancments work well, but none of them adress this situation. I can not speculate as to why Deere builds rotary combines. The problem is not with the walkers, or the beater grate. It is in the concave. let's go through it from front to back. 1.Cylinder bars must be in good shape-more than .25 inches tall. 2.Same for the concave. There's a lot of 9000 series combines with broken front bushings, this doesn't cause the whole problem, but certainly adds to it. If they are broken the concave will be impossible to adjust. 3.This is the key. The concave must be level and proportioned with at least a .125 difference from front to back. WhyIJ because as the crop mat travels over the concave it gets thinner from front to back. If the rear of the concave is lower than the front the combine will have walker losses. An eighth of an inch isn't much, but it makes a world of difference here. 4.Adjusting the beater grate to the upper position will not help. If the cylinder and concave wouldn't thresh, the beater sure won't. What it will do is cause backfeeding, further reducing the efficiency of the combine, and probably causing more loss. 5.The curtain on the beater grate requires that the beater grate be operated in the upper posistion. 6.Just take the grate out and replace it with a finger grate from a spike tooth concave. Bolts right in. 7.Go drink a cold beer. After that you'll need something to improve your disposistion. 8.Corn inserts should be out unless you're in wet corn. Same with the filler plates. This is a dirty, nasty, itchy job. I only know that this works in corn and soybeans. We grow little wheat here, I can not say I have any experience with it. Joe