Combines Rotor loss maybe I m too picky

How are your concaves setIJ do you have every other wire removedIJ Do you have your veins in the back positionIJ If you are getting 5mph out of it with a 8 row head in 200 bu corn that is pretty impressive.

Ok, bare with me for a minute please. I have never combined corn, so there is my disclaimer, but I cant help but wonder if slowing the rotor during the heat of the day might help. That is if you have any more room to slow it down. Other wise do you have anymore power left that you can open up the cleaning unit and push the rotor a little more to make it think its still fullIJIJ I have a full set of gorden bars on a 1680 that I use in grass and small seed legumes. The added threshing and seperating abilities of the bars really do change the entire machine. I found that I had to completly redo my settings and somewhat modify my ways of diagnosing which setting to change first. If you were combining grass seed, by your description of the problems, I'd try to convince you that you are either not keeping the rotor full during the day, or you need to slow it down to stop some of the break up of material. How far off am IIJIJ

Just a couple of ideas, one reason you might be having rotor losses in teh afternoon, and not in the morning is the condition of the corn crop. In the morning the stalks are tough so your stalk rolls work really well at pulling the corn stalk down through the head. As they dry out in the afternoons, they get more brittle causing your stalk rolls to become less efficient and causing more trash to go through your combine which causes the trash to carry some of the corn out the back. Ok, having said all that, I did a couple of things to help my rotor losses, make sure you have straight separator bars on the back of your rotor, I didn't have any on my rotor because it was a wheat machine. Also you might want to check with Calmer Manufacturing. They make kits to help with trash in the head. I bought some of thier smaller sprockets last year which slows your gathering chains down and gives the rollers more time to pull the stalk through. They work excellent.

ROUNDBAR CONCAVES quit messing with the rasp bars

I have had similar problems with a 1688. Removing every other wire in the third concave was a big help for me. That dry trash in the middle of the day really changes the grain loss readings on the monitor.

In response to cutter 2388. Yes I do have every other wire pulled out of rear half of the concaves and yes the vanes are are in the back position. I do agree that 5MPH is impressive but I would like to be able to do that in the middle of a dry sunny day and not only at night. I know this is against what Gordon says ,but has anybody tried spiked rice bars in the seperation area.(And still ran wheat thru the machine)

Absolutely no spiked rasp bars when doing corn. You will see rotor loss like you can't imagine doing that. Also don't use the interuptor bars in the grate area.

Yes, I have installed Spiked rice bars to help disrupt the sucks and trash from entrapping the grain. It does help some, probably wont eliminate the problem totally. For the corn machines I like the ole standard rotor. Not a problem to put the Stewart Steel auger front on a standard rotor, have done it and works fine for me, best of both worlds. I think for a quick fix if I was you I would go for the rice bars in the rear and interupters. Plus like the other gentleman said, if you can reduce the trash intake on the cornhead your way better off not having the MOG to separate out.