Don't know the capacity in bushels_hr or anything like that. If you are overloading it you will start to get corn in tailings. Don't know if that is because of overloading elevator or if because of too much corn for sieve to handle. I have had the belt slip when I get a full hopper. I've got a Crary extension, with a bubble up auger. In 25% corn or more that is 210 bu. plus, with a 12 row 30 head I have to slow down to under 2.5 mph when hopper is almost plumb full. Keep in mind that that is testing the limits of the system. The strange thing is that it only happens with a certain variety of corn, it doesn't happen in any other ones. When that happens you have to open the door, run the machine, and leave a little pile of corn for the deer and pheasants before you start up again. It is all a 10" auger out of a dumpit, feeding into a 12" auger can do to keep up with the combine. Today we were on a field at the end of the driveway, 1_4 mile haul with a guy with very fast turnaround time. By the time he's unloaded the semi we've got a 950 bushel cart and 1_2 a hopper on the combine. So that elevator is really pushing the grain.