I am having the same problem on our 8010 in rice with a stripper head. The shield on the bottom and one side had been taken off by the previous owner. We've only been able to run a few hours since we put the shields on due to the rain. I think the fan is still sucking straw because the sample started getting trashier before I got stuck. Haven't had a chance to check the fan and sieves because we have the track off of one side of the combine.