TX JIM- none of the parts you show on the diagram are timed to the plunger IIRC the #9 part engages for lack of a better term a dog clutch on a shaft that is timed to the plunger and that's what drives the knotter assembly and needles. I would believe a bad needle brake if the problem was occurring with the needles partially in the chamber but when it malfunctioned the needle tips would be all the way in, up by the knotter. With the post mentioning a brass shear/drive pin I would suspect that was broken and was driving the knotter most of the time but when it would malfunction the driven components of the knotter and the needle yoke would stop or stall during the cycle leaving the needles in the full up position about the same time the plunger would hit the chamber stop dog. Incidentally the #9 part is what our neighbor put the extra spring on so maybe you are right what was supposed to hold it place was defective but still if my memory is correct all that does is trip a clutch on the timed shaft and components driven off the timed shaft would be were they shouldn't be.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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