When you need to see the parts moving to find the problem, get a helper to turn the flywheel, very gently, until it stops. Then have your helper turn the flywheel backwards until the knotter begins turning, then turn it forward again until it hits the obstruction. Repeat this over and over while looking at every moving part. Sometimes you can hear it when two parts make contact that are not supposed to. Since the clutch will not turn the knotter shaft backwards, you will need to clamp a pair of vise-grips somewhere on the shaft so you can turn the shaft backwards as your assistant turns the flywheel. My first thought was the plunger lock, but you specifically said knotter shear pin; but the plunger would have locked long before the needles got that high in the chamber. Also bothers me its doing the same thing after changing the knotter assembly. Without being there to see it we are kind of shooting in the dark, but I think rocking it back and forth against the obstruction you will eventually find out what is hitting.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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