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Discussion Starter #1
Has anyone made any mods to redirect the airflow to the outside of the sieves at the from. On my 660 it seems to have quite a dead spot at the front outside corners of the sieve thus causing it to load up until it creates enough air pressure to life the material on the sieve. I am thinking of putting air deflectors to push some of the air to the outside and help keep the material suspended. I have the fan speed up kit on it and have the problem mainly in wheat but can see it happen in heavy beans as well.
 

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Has anyone made any mods to redirect the airflow to the outside of the sieves at the from. On my 660 it seems to have quite a dead spot at the front outside corners of the sieve thus causing it to load up until it creates enough air pressure to life the material on the sieve. I am thinking of putting air deflectors to push some of the air to the outside and help keep the material suspended. I have the fan speed up kit on it and have the problem mainly in wheat but can see it happen in heavy beans as well.
We have tried this a couple of times (on JD & Gleaner) what we found was that we created a low pressure area on the front sides of the deflector. This pulled most of the chaff thru the center area and
would block air between the deflectors. May have been the angle at which we installed the deflectors. At any rate, we couldn't make it work.

Best bet is to block about 16" at front of the chaffer so MOG can't be forced thru. This will spread the air around and you usually can open the rest of the chaffer wider and eliminate some of the venturi effect off the chaffer surface.
 

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Discussion Starter #6
The more air you have the better you can clean with. I usually run my fan full out and control the air with the sieves.

I made an adjustable airfoil cascade pan for my combine to try and see if that will help delete the dead air spots at the front corners of the top sieve, I will let you know if that worked or not soon and post some pictures of it. I still think that I may have to add a wind board to help to get the air up and out to the top sieve.
 

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The reason the sieves are loaded on the sides is the way the rotor thrashes & throws a majority of the material to the sides leaving an open space in the center of sieve & therefore air escapes through this area & not the sides. I would suggest find a way to load the sieves evenly.
 

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In an attempt to get the mog distributed on the sieves more evenly on my A75, I installed a concave deflector plate (#25457540W1) and the brackets to hold it (2547531W91) on the left side. Then I set the angle to help deflect the material toward the center of the sieves. It wasn't too much expense and easy to install. I think it helped.
 

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Discussion Starter #9
Just an update. We made an adjustable cascade an and it has made a world of difference in all crops. I knew it would help in wheat but did not expect the advantage in beans and corn to the e4xtent that it did help. I am still have a little problems in the front corner with wheat but I am starting to think that if I change rotors it may also make a big difference in the MOG I am dealing with. I am leaning towards the Kucher rotor which is a segmented rotor like all the new combines. Any thoughts or people who have used it. TIA
 

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Just an update. We made an adjustable cascade an and it has made a world of difference in all crops. I knew it would help in wheat but did not expect the advantage in beans and corn to the e4xtent that it did help. I am still have a little problems in the front corner with wheat but I am starting to think that if I change rotors it may also make a big difference in the MOG I am dealing with. I am leaning towards the Kucher rotor which is a segmented rotor like all the new combines. Any thoughts or people who have used it. TIA
Have you got photos from this adjustable cascade pan?
 

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Discussion Starter #11
Back here finally with some updates. I have made many more changes and finally have the machine close to where I would like it. I made my own speed up kit (faster than Agco's) and can run my fan up to 2400 RPM now. I made deflectors in the air tunnel to keep the air flow going straight up it and not narrowing up like the shape of the tunnel causes.
 

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Discussion Starter #13
I can run my lower sieve almost wide open in most crops which has greatly increased my cleaning capacity. With all the extra changes I have made it also takes more air to clean. The extra fan speed also allows the chopper to spread better due to more airflow through it. I am hoping to start in wheat tomorrow and try the new kuchar rotor that I have put in. This should allow for better separation as it have almost twice the depth from the rub surface to the tube allowing for more tumbling for better and easier separation
 

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Discussion Starter #14
The new rotor made a huge difference. I was putting less out the back at 4.5 MPH than I was at 2.5 with the original rotor. Still going to be a long time to pay the price of the rotor back on what was lost out the back of the machine but it also used less fuel. Will be interesting to see the difference in beans and corn.
 
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