Fordfarmer,I have combined LOTS of dry corn here in Ga over the years and if the moisture is 15% or below you are probably going to have cracked kernels.The cyl speed on my 642's will only go down to 600 from the factory and that isn't low enough.Generally speaking on a conventional combine cly speed causes cracking and concave clearance determines if it will get it off the cob or not.Try running your cyl speed as low as possible and the concave wider open than normal.Sometimes I put mine completely wide open and drive faster to keep it full so it will shell it all off the cob.On my Fords you can adjust the back of the concave down with the linkage on the side of the machine so it has more clearance and it seems to help.One more thing to check is to make sure your elevator chains are tight because a real loose chain will let the corn get between the sprocket and chain and cause cracking.
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