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When you lift the shifter cover off the transmission you will be able to clearly see the gears and the three shifter forks, with their groves that the end of the shift lever slides into. The forks move front to back, with the three of them aligned side by side. In true neutral, all three will be lined up to allow the shifter to move back and forth across neutral, allowing you to select whatever gear you want. You will be able to feel pretty readily when a fork is in neutral by prying it fore and aft. You will also very quickly catch on to the visuals of how this motion moves a collar onto splines engaging the various gears. The gears themselves are constant mesh, with this splined collar engaging and disengaging various ones. As you familiarize yourself with this particular transmission, you will probably be able to see which ones are engaged as the tractor sits right now. It will take a bit of force to move these shifter forks. After all, just think of the leverage you have with the shift lever. But of course don't go bonkers with a huge pry bar and sledge hammer trying to move things. It's just that they do not shift positions with your finger twiddling them. Sometimes I do use a hammer to tap them, but never to whale on them. They can be bound up pretty hard when stuck in two gears. Once you've familiarized yourself with the neutral position on the one free moving lever and by looking at where the stuck forks are, you may need to apply some judicious force. These forks are ball detented (I think), so that will also give you a feel for neutral. Don't worry, it's really a pretty simple thing once you're in there. Gives you a nice sense of accomplishment when you're done.
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