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Discussion Starter · #1 ·
I have a 1997 2188, that I purchased last year at the end of wheat harvest, so I have only harvested about 300 acres of wheat with it last summer. This is my first full wheat harvest with this combine, and I am not real familiar with CIH rotaries.(Always had JD green machines in the past). I have a friend running this combine,and has been doing a very good job of cleaning the wheat, EXCEPT when he gets into real heavy wheat that has some rye in it. In the heavier wheat he has had a hard time of cleaning the chaf out of the wheat, plus the rye. Local elevators are really cracking down on dockage this year, and we have not been able to send a load to town without at least a 1% dockage for "chaf". I dont know if that is possible to be any better, unless I take them a bag of certified seed wheat!(lol). Anyway, my operator has the air up to max(I think about 1400), and the concaves set on about "2-3", with sieves cranked down pretty tight. It just seems like we need more air, but cannot get any more out of what I have. This machine has the specialty rotor, with small wire concaves and slotted grates. Do the make an upgrade for this machine that might be able to increase the air, or are we missing something with our other adjustments? Thanks for the help,
Jim
 

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What is your rotor speed sb min1000. Make sure your cut off plate for the fan is down(hinged plate rigrt behind on top of the fan). Dont close your sieves too far.
 

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Discussion Starter · #3 ·
I think he is running the rotor speed between 850-900. I will check the cut off plate for the fan, as that is something I have not heard of, but we are going to the field soon, so I will take a look and see. Thanks
Jim
 

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Discussion Starter · #4 ·
fan cut off plate was in the proper position. Still always have at least 1-1.5 % dockage for FM, which is mostly chaf.
 

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Closing sieves is a trade off between cleaner sample and less air. Sounds like your sample is clean other than the chaff, so I would open the sieves back up a little, thereby increasing the air, until the chaff goes away.

You'll never get all the rye out with sieve adjustments.

My $0.02,

OKFarmer
 

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The easiest fix is to drive it to the Deere dealer and get a green one again...

Not on a more serious note, Most people think they get the same air out of their chaffer & sieve no matter the settings, so they try to be conservative and close them down a little tight, open them up and let the air do the work, it amazed me when I figured that out myself.
 

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Ya, get a green one if you want a poor sample and spend a lot more fuel to do it!!! I agree with okfarmer, open sieves back up. I adjust the sieves as a last resort. Usually most problems can be fixed with adjusting concave opening or rotor speed or both. When you close the sieves it can distort all the other settings. They may all need adjusted to compensate for the lower amount of air. Thats why I adjust them last. Most times I can fix any grain sample quality issues without touching the sieves. Once you get the hang if it you can't beat a red rotor for a good grain sample. Your coop sounds like mine, No matter if you took a load of bagged seed wheat in they would try to put a dock on it! Some varieties are harder to get a perfect sample. Last year with the wheat being froze out and horrible test weights it was a poor looking sample. The coop thought ours was amazing compared to the guys using the green rotors. But the guys running JD walkers had a good sample. It was kind of interesting.
 

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I agree with others about the sieves. Here are our settings for very dry red wheat (9-12%).

Rotor 900-1000rpm. Small wire concaves in all three positions. We close the rotor down pretty tight, about 1 or even a little tighter. Fan about 1100rpm. Depends on MOG and moisture, but around that number. Sieves open between 1/4" and 1/2". Good luck.
 
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