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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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