Case IH 8230 Bottom Sieve lack of air flow. - The Combine Forum
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post #1 of 20 (permalink) Old 06-11-2019, 11:10 PM Thread Starter
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Case IH 8230 Bottom Sieve lack of air flow.

In some situations I have known people run the bottom sieve wider than the top sieve / chaffer sieve to allow for more air flow.
In Australia I understand all machines are supplied with the 1" 1/8" sieves
Has anyone tried the 1" 5/8" sieves to see if this would create more air flow?

Having flooded the fan housing before with the pre sieve set wide and the bottom sieve set to allow a clean smple, having more air flow would be desirable.

Having been on New Holland combines for many years they used to advise not to have more than 3mm difference between the top / bottom sieves. So to run the bottom sieve wider than the top sieve seems to mess with my thinking??

What is peoples thoughts and experience with this situation?


Happy tinkering

John
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post #2 of 20 (permalink) Old 06-12-2019, 12:09 AM
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I would try running it wide open, clean with the top sieve.

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post #3 of 20 (permalink) Old 06-12-2019, 12:22 AM
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If by pre sieve you mean the bit of the sieve at the font of the top sieve, that should never be open very wide. At most the pre sieve should be open as wide as the size of the grain you are harvesting. In other words mostly closed. It's there for corn.

If you're talking about the top sieve (the chaffer), that's another story. In theory the 8230 sieves should be set identically to the way you set them in New Holland. The New Holland CR and the 8230 share the same cleaning system.

In my conditions, in wheat, we find the best results closing the top sieve down maybe to 10 and opening the bottom sieve, perhaps to 12. In my opinion the rethresher doesn't do much in small grains, so cleaning with the top sieve essentially bypasses it. If there are increased losses because of that, it means something needs to be changed in the rotor. Such as closing the concaves a bit, or speeding up the rotor some. Sieves actually work best when the material is suspended by air, with the grain just heavy enough to fall through it. Someone on the forum has a technique for tuning the air flow but I never quite figured out his procedure.

But most people run the sieves conventionally and seems like it works fine most of the time. I think you'll find on the 8230 if you start with the computer's default settings for your crop type, you'll have better luck than if you just try to set it according to your memory of other past machines. Can make changes from there of course, but it's a good starting point.
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post #4 of 20 (permalink) Old 06-12-2019, 02:53 AM
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As torriem said, CR’s & Case share the same cleaning system (pre “Opticlean) albeit the fan, shoe drive are different & rethrasher is different.
In theory, the Case fan should be much better than the “old paddle fan” of a CR! Well, it’s not the fan that’s the problem.
I tried the inverse sieve settings & never got any satisfactory results.
To cut a long story short.
Make sure the concave is LEVEL & CENTRE first. Can’t stress how important this is to get this right. It’s in the operators manual & it’s 87mm for Level & 87mm for Centre .... AFX Large Tube rotor.
Make sure you have very good concaves in #1. I’ve found deep wire helicals work best in #1 for just about every crop. Cereals, canola, pulses etc.etc. These work.
If you haven’t yet done so after harvest, pull all the sieves out & clean the rails. Check all sieves are not worn out or broken any louvre wires. 1200-1400hrs is all you’ll get out of sieves.
Refit bottom sieves & make sure they open - side to side - evenly. Adjust as required, then calibrate them.
Fit top sieve rear curtains before refitting top sieves. Adjust sieves as required, then calibrate.
These curtains make a big difference to a machine that is set & calibrated correctly. The curtains make the air go through the sieves instead of going out any area that has the easiest exit.
You’ll find a much more “settled” & consistent machine once you done these things.
It’s no bullshit ..... they work ....... & it’s cheap to do.
Happy to discuss further if you want........ but all these other things MUST be done first. There’s no one “silver bullet” in making machines perform better. It’s incremental steps that get you there.
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post #5 of 20 (permalink) Old 06-12-2019, 07:46 AM Thread Starter
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Thanks again Rod,
These curtains...... have you got a photo of them in the header?
I assume they go between the bottom sieve and the pan under the bottom sieve to force all the air through the sieve?!

John

Happy tinkering

John
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post #6 of 20 (permalink) Old 06-12-2019, 02:14 PM
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Those curtains go on the back of the upper sieve. Between the sieve and the fingers on the back. The holes in the curtains are for the linkage for the sieve adjustment.
Not sure where to bolt on exactly as I haven’t put them on our machines yet.
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post #7 of 20 (permalink) Old 06-12-2019, 05:28 PM
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Quote:
Originally Posted by Thrasher12 View Post
Thanks again Rod,
These curtains...... have you got a photo of them in the header?
I assume they go between the bottom sieve and the pan under the bottom sieve to force all the air through the sieve?!

John
I’ve got a video of them installed but this forum has the added benefit of not being able to post videos!
I can email or text you the video if you send me your details via PM.
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post #8 of 20 (permalink) Old 07-07-2019, 10:29 AM
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Could u text me a pic of where these curtains go also have problems plugging cleaning fan in mustard I have to slow fan down to minimize blowing it out the back and then my fan plugs up
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post #9 of 20 (permalink) Old 07-08-2019, 02:42 AM
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Could u text me a pic of where these curtains go also have problems plugging cleaning fan in mustard I have to slow fan down to minimize blowing it out the back and then my fan plugs up
PM me your number & I can send you the video.
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post #10 of 20 (permalink) Old 07-08-2019, 08:33 AM
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I'm kinda new to this how does pm work

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