Combines heads in sample

How low are you cuttingIJ You need to have some straw for the heads to rub against and thresh. I would make sure I was cutting the head plus 8" of stem or as close to it as I could. Often times a simple raise or lower of the header is all it takes to clean up the tank. Allthough I am assuming that you are cutting wheat. If your wheat is short and somewhat sparse, and you cant cut that low, you have to fool the combine into thinking its has more material than it has. To do this I blank all of the second concave, slow the rotor down to about 700 on the 40 and 60 series. This way the feederhouse can stuff more material in per revolution of the rotor and make it act like a full machine. How far down are you pulling the rotor rpms from empty when you are combiningIJ And how is the loss on the rest of the machineIJ

What condition are your concaves and rotor bars inIJ It sounds like your concaves are worn too much to get a good threshIJ Do you have all the bars on the rotorIJ

My concaves were gone over by St. Johns a few years back. I checked and the concave seems quite good and I have all the bars on the rotor. My sample is really good except for the white caps. Do you think changing my vanes would helpIJ

I have not been able to improve the threshing much in tough wheat by retarding the vanes. However, I did notice the increase in power consumption immediately. Personally, I would leave the vanes in the mid position I think. I can't figure out why you are getting the whitecaps with the built up concaves, cover plates, and standard rotor. That should be an aggressive combination in wheat. I would try increasing the rotor speed if you can.

Are these heads with grain still in them, or is the grain threshed outIJ Is there a chance that you've removed the straight rotor bars from between the spiral mounts at the front of the rotorIJ Do you have any interrupter bars installed in your concavesIJ How tight is your concave settingIJ Sometimes in tough conditions when concaves are set very tightly, wheat heads can escape from the infeed cone by being forced underneath the feedplate on the front concave and these go directly to the shoe augers.