Combines 1660 Impeller blades hitting

First, is your header still straight and level with the machineIJ If not, I'd start with that. Get it straightened out then check for noise. Also make sure your header acumulator is set properly to help cusion the blow if this happens again. Are you sure its the rotor hitting something, and not the rock trap beater or the feederhouseIJ Did it make the noise with just the seperater runningIJ look at the paint around the feederhouse and rock trap area to see if there is any unusual and fresh paint flaking. This would indicate something bent. To look inside and inspect the rotor impellers with the rock trap on, lower the header and just take the sheild off right below the cab and then unbolt the half moon shaped front cover. Pull it off and look inside. If the rotor is in neutral, watch where you put your fingers when turning the rotor by hand. To replace the impellers, you dont have to remove the feeder or rock trap. You can do it from that very cover you just took off. They're heavy and awkward, so dont get careless and hurt yourself. If you notice the kidney is worn and the edges are rounded off, you may want to replace it too. Then you will have to set aside more time as it will require more disassembly. If you decide to replace the kidney, and you think you can get by with the impellers through the soybean harvest, wait and do it all together. It will be easier that way.

Old Pokey, The contact only happens with the separator on, not the feeder house. I did turn the rock trap beater by hand so that it did not contact the impellers before I tried. Also, I took a marker to the leading edge's of the elephant ears and ran the rotor up over 500RPM (once the contact started). When I stopped and checked to see for worn of paint, there wasn't any. So the contact is happening somewhere around the kidney IJIJIJ Thats the part I can't see. One more thing, Does the kidney hold the front bearing or is it bolted to the back side

Ok, how did you get the paint on the impeller edgesIJ If you take the shield off right below the cab and unbolt the half moon shaped cover, you can see the kidney from there. The channel that goed accross the machine just above the rock trap is the bearing support plate. The kidney is the bearing housing. It is the cast piece bolted to back side of the support plate. After you pull the half moon shaped cover, you have access to inspect the kidney and impeller knives. Its probably the knives touching the shearing edge of the kidney. Which is what you are thinking it is. The reason it hits after a certain speed is because the rotor is trying to screw itself out the front of the machine. Even the amount of air that it pushes when empty will cause the rotor to flex the support plate enough to let contact happen if the knives are too close. Simply loosen the bolts that attatch the knives to the impeller blades and push them back just slightly. Ok, the knives, as I call them are usually called wear plates. Set the knives back so you have about .030" clearence between the kidney and the knife. If you run soybeans that have some green stems and are kind of tough, it really helps to run sharp knives and set right at .030" from a good square kidney. If you are going to replace the impeller blades and service the front side of the rotor, I'd try the Marlin impeller blades. They take up less power and quiet the machine down a lot. When you fell in the wash, it probably flexed things just enough to cause the support plate to shift slightly around the bolts. That could be why it is touching now. Just adjust the knives back for now and when you replace the impeller blades you will have remove the support plate anyway and when you reinstall it it will be back in its natural resting position. Hope this helps. let me know if you have further questions.

Thanks Old Pokey. I'll adjust the knives to 0.030" when I install the new ones. Scott