I figured out the last issue on the new to me R70 about the distribution auger belt and pulleys with a little help from agco parts book and a chat with the dealer but now that we have that issue fixed the discharge after the impeller keeps plugging. I did take the cover off and see that all 4 of the blades were all bent on the rotor side so common sense tells me that's a problem and I have new ones set aside at the nearest dealer, but what I'm wondering now and since I don't have a manual to check is whether or not the impeller can be sped up like the chopper on my R62? I didn't see any way to change idlers or pulleys to speed it up. I do know that this machine was mostly used for corn and the previous owner told me that it also was used for sunflowers all of which I'm assuming would run at a lower speed if the speed could in fact be changed but the wheat straw plugs within the first half acre or so. So I guess ,y two questions would be... Will the new impeller blades fix this or should I be looking somewhere else also? And would the impeller be single speed?