Two things that come to my mind have already been mentioned but I'll mention it again.
Thurlow mentioned register. Was the last picture taken at the same time the next-to-last picture was taken. It looks like, from my angle of view that the sickle should be about half-way through it's stroke by the way the flywheel looks, but the knives are far from centered between guards. Maybe it's the view that's throwing me off, though. Is the pitman too long or short, making the pitman end of the sickle hit something when it's running up to speed? Is the head of the sickle too sloppy in the slides, allowing it to flex? That would cause more sickle breakage problems than pitman breakage, I guess.
PTO speed? Too slow and the sickle doesn't have enough inertia, especially for cutting fine grass. Too much PTO speed and the poor ol pitman just won't be able to take the stress.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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