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We have a 693 cornhead and we are having trouble with cutting the stalks off. All the head is doing is pulling the ear off and leaving the whole stalk. We are running around 4-4.5 mph. We switched the sprockets on the right side of the feederhouse but it still didnt make a difference. We also messed with the button in the cab to try to speed the head up but that didnt change anything. If anyone has any suggestions on how to fix this please let me know. Thanks
 

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The sprocket on the feederhouse only changes the feederhouse speed. You could change the sprockets on the head. Put the larger sprocket on driving shaft, and the smaller one on the driven shaft. Is the backshaft speed changing at all when you push the button?
 

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Do you have regular rolls or knife rolls? how fast are you running your backshaft. We have the same problem but JD heads are known to leave the stalk standing more than other brands. Knife rolls are the first option. Faster backshaft isn't always the best idea because it causes more shatter when the ear hits at the higher speeds.
 

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should change speed...we're running our feederhouse on the slow pulley but with a 700rpm high idle/no load backshaft speed thats about 640rpm in the field combining. Works very well...the knife rolls arw a little dull though so the stalks are about 4" taller than our new knife rolls were last year.
 
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