7720 leaving corn on cob

4520BW · Sep 28, 2015

I started shelling with my 7720 and can not seem to get all the corn from cob. tried speeding up cylinder and lowering concave but end up leaving corn and cracking it. It does have the Trimpe hardened bars. Corn is 16%. Any ideas would be great!

Mike Aylward · Sep 28, 2015

It sounds as though your concave is too loose and your cylinder speed may possibly be too high. With corn that dry you shouldn't need over 380 cylinder RPM and probably not even that fast, depending on variety. Be sure your concave is proportioned to the cylinder per your operator's manual. If your cobs are split crossways your concave is too loose. If the cobs are split lengthways the concave is too tight. Mike

todd hamilton · Sep 28, 2015

Also what is your ground speed? You need to keep the cylinder full for optimum results

4520BW · Sep 29, 2015

I think my problem is the cob is still green. The 22 inches of rain july and then a dry fall has something to do with it and the special bars are not good for corn like that. My neighbors 9500 with them is doing the same. Anyway started running the 9510 in corn with factory bars and not having any problems

fastfarmall · Sep 29, 2015

Do you have your combine equipped with filler plates, the one that go between the rasp bars ? At 16% that should be ideal.

nh8260 · Sep 29, 2015

Jeremy is right, last year I had two different varieties of corn, the pioneer had a smaller diameter ear than the dekalb, so when it went through my Gleaner K the dekalb did great, no kernels left no broken cobs, the pioneer did like you are saying, left some kernels on some of them, I didn't have enough pioneer planted to change the clearance so this year I went with the dekalb variety since it shelled so well.

7720 leaving corn on cob

4520BW

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Mike Aylward

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todd hamilton

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4520BW

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fastfarmall

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nh8260

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