the torque amplifier on a 706 is the same unit as used from that tractor all the way up to the 86 series. it is a two-speed transmission controlled by hydraulic clutches right in the front end of the speed transmission (the 1-2-3-4). you shift "on the fly" (no clutch needed-even under load). extremely handy feature. forward is direct drive and back is, i think, approx 1/3 reduction in gear ratio. if you can't tell that it does anything, something doesn't work. it should be a very noticeable change in speed. tough to diagnose remotely- could be as simple as the linkage is disconnected or out of adjustment, or there could be big problems with the ta unit itself.
i wouldn't necessarily jump to the conclusion that your transmission problem is worn gears. they can take a lot of use & abuse, but the shift linkage is much more trouble-prone. sounds like something isn't right in the moving parts on the underside of the transmission cover. i'm sure someone else on this board has more experience in that particular problem.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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