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When looking at the concave make sure it is hanging true where it's supposed to. If not there could be a broken hanger on the outside of the machine. We had this happen twice on the left side of the machine.
Also make sure the straw walkers don't have any stress cracks in them. We had to replace one and later add reinforcements to the others.
We had one of the last 8820's built. We bought it used in '93 and ran it 'til it burned in Sept. 2007 with over 5000 hrs. on it. We had done a lot of work on it over the years and it ran like a top 'til the end. 8820's are very crop hungry and aggressive machines but you need to pay attention to bushings and belt wear before they give problems. We were told by a dealer that the 8820 was probably the best combine John Deere has ever built.
 
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