We have run a 6620 combine the last 15 years on small acreage. Overall, we have been real pleased with machine except the feeder house reverser. We have been through 3 of them. The last one installed by Deere made it 600 acres and we never used the reverser because we were paranoid about tearing it up! The lower sheaves gradually work themselves away from the gear case. Anybody else had this problem and is there a solution? Thanks in advance.