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Combines & Harvesters Discussion Forum

Re: 6620 6 row narrow head in 193 bpa corn... several quest

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JD Seller

11-13-2012 05:42:25

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John the shoe augers WILL not grind corn. They fit real loose in the shoe auger trough. They just do what the raddle chain did in your Gleaner. They just move the corn from under the concave. No way for them to grind corn. You are seeing ground corn there from under the concave.

The shoe augers are turning??? I have seen the slip clutch jaws break and the augers not turn then you will grind the heck out of the corn because the cylinder has to throw all of the corn out the top back. Check that out. It is a long shot but I have seen it happen.

I am willing to bet that the cylinder/concave clearance is still set too close. You need to really look at the cobs and see what they look like on top of the straw walkers. Also if the corn is real dry you may need to open up the concave and really push the combine faster to keep it real full. Corn rubbing on corn will shell without damage in a soft kerneled corn. I mean really push the machine. The JD 9000s are real bad about this. Most guys slow down when they see cracking shelling problems. This sometimes is the wrong thing to do. So try opening it up until you have good whole cobs. Even leaving a few kernels on the cob until you really fill up the cylinder. The push it and see if the damage goes down.

I have seen some varieties of corn that shell harder and they will have damaged kernels at the cylinder no matter what you do. Even some times a rotor machine will do it too in those varieties.

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Mike Aylward

11-13-2012 06:33:46

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 Re: 6620 6 row narrow head in 193 bpa corn... several quest in reply to JD Seller, 11-13-2012 05:42:25  
The 9000 series combines are not bad about grinding corn. Not if they are set right. I own a 9500 and can make corn look like it came out of a hand corn sheller. Mike

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JD Seller

11-13-2012 17:30:05

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 Re: 6620 6 row narrow head in 193 bpa corn... several quest in reply to Mike Aylward, 11-13-2012 06:33:46  
I did not say they ground corn. I said they needed to be crowded to be kept full to shell some corn. I have seen varieties that where they would leave corn on the cob but you could not set the concave any tighter or they would split the cob. Solution was to go faster and crowd the corn through the concave.

A JD 9000 series is a lot harder to get used to setting than the 20 and 00 series combines. You have to do it step at a time or you will never get them set right.

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Mike Aylward

11-14-2012 06:56:32

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 Re: 6620 6 row narrow head in 193 bpa corn... several quest in reply to JD Seller, 11-13-2012 17:30:05  
The "problems" with the 9000 combines is the book. The suggested settings are abysmal. This year I shelled some drought corn making 40 bushels and the combine did a good job without any cracking. You simply can't set these combines by the book. Actually, no combine can be. It is only a starting point, not gospel. If you know how a combine works you will set it by conditions, not by the "suggested settings". Mike

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