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Hello Francisco from Argentina, I have problems in grain loss in wheat, with the challenger 660. I read other forums and it seems that the cleaning area gets full of mog making the chaffer to be over loaded. I think that the solution is an air foil chaffer, here in Argentina air foil chaffer are not common. I try with agco parts dealers here but they told me that airfoil chaffers don’t exist here. I was wondering if someone is so kind to send me some pictures and measurements so y can try to do one here. By measurements I mean how big are de holes, distance between them, distance between each section o row. Also the angle, it seems to me that it has an inclination. This information will help me to try to solve my problem.
 

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It would be easier to get one shipped from Canada.
Harvest services 1 800 667 2601 or www.harvestservices.ca.
Combine world 1 800 667 4515 or www.combineworld.com
Be difficult to build that.
I would get by with the chaffer you have now and remove all the rotor knives off first
 

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Agco lists a airfoil chaffer and kit in the parts book.
I am going to assume nothing in stock in the parts warehouse in argentina?
Not a bad idea to check the movement of the grain sieve.
Had a grain sieve that got some small stones jammed in the front louvers and broke the louvers.
Plus material packed in around the outside edges of the wires some were seized, and the louvers were not moving evenly.
Crawl in there on a board with a light and check things out.
Get someone to move the grain sieve and see whats happening
 

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You can pretty much do what an air foil chaffer does with a normal sieve. Close the top sieve down a ways from where you normally run it, and open the bottom sieve up quite a ways. Then you work on your fan speed to just barely suspend the material above the sieve. Basically you're cleaning by air flow, not by bouncing it across the sieve.

That's also how an airfoils chaffer works. You basically run with the bottom sieve wide open and you just adjust the fan speed for diffeerent crops and conditions. I think some people find them very hard to work with, which is why airfoil chaffers are no longer as popular as they once were years ago.
 

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This kind of speaks to the Agco parts system.
If you need a chaffer why won't Agco dealer get you one?
Situation I had 10 years ago overhauling a 24spd powershift in a MF 2705 tractor the intermediate clutch powershift disc was back ordered none in any north American warehouse.
And none on any search the dealer could do.
Dealer contacted somebody at Agco parts.
Nice lady called me direct from Agco says the discs are on the list to be built but she will get me one.
She scoured all the dealers stock and found one someplace and air freighted it in to Regina at their expense.
I was fairly impressed by this lady and Agco at that time.
Maybe it depends if the dealer is just lazy?
 

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I had a friend experience the same problem you are with a A85 Gleaner. I remember him taking a cutting torch to something on the rotor but can't remember what. He has since passed so I can't ask him what he done.

I think St. John's did something similar also but I believe they closed up also.

Maybe someone out there that knows the remedy to the overthrashing?
 

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Make sure you talk to someone that has a airfoil chaffer before you buy one. The problem with a lot of of airfoils is they did not work well because they were not designed right to get a lot of air flow through them. The ones harvest services had years ago were poor for air flow. Hopefully they have improved them.
 

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I have a fixed airfoil in an MF 8780xp.
Similar machine to the challenger.
I am not convinced it makes that huge of a difference.
 
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