There are others here that can explain how a TA functions better than me but they were designed to basically give you a high and low range for each gear and to be able to do it on the fly with out stopping or using the clutch. When used correctly they are quite handy and reliable. Over the years many of them have gone bad, mostly on the low range due to not being used properly. Allowing the tractor to coast with the TA in low range will eventually cause it to fail. When that happens the tractor still works in the high range but no low range and thus no TA. There are parts that just wear and cause an issue on the low range. When buying a tractor one wants to always check out the TA - many previous owners did not know how to use them properly and now they don't work.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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