The most common failure mode for the mechanical TA is it'll "go out on the low side." That means the tractor will stop moving when the TA lever is pulled back.
It can be repaired fairly inexpensively if you do it yourself and only replace the parts that absolutely need to be replaced. That's normally just the ramp and rollers.
Normally, the tractor can still be driven indefinitely with the TA lever ahead, using the high side, even if the low side is out. It's not something that has to be fixed right away, or ever.
A lot of people freak out and try to "eliminate" the TA, but you're ruining the best part of the tractor! Yes, replacement is expensive. Rebuilt TA units are still available; the kit to eliminate the TA is not.
My recommendation is to fix the TA. You'll NEVER use the tractor as hard or as much as it was when it was new, and that TA lasted 50 years. A new TA will NEVER wear out.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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