Just graduated from a 6620 to a 9610. Why does this machine growl, slug feed so bad . Everything looks like it is coming into the header fine. It sounds bad and the rpms on the cylinder go up and down despite constant ground speed and header operaction. AND on another note, on the shaft where you hook up the header , there is a sprocket with 2 different sets of teeth. Which should I be on for soybeans? Maybe this isnt right. Just noticed it tonight.... I remember it being on the larger of the two on the 6620. Thanks to everyone helping so far !