Generally, the part of the TA that most often fails is the lock-up sprague clutch that only functions when the TA is in low range. It needs to lock up so the power will be transferred through the planetary reduction gear set when the TA disk clutch is disengaged when you pull the lever back. If you hear a major whirring sound when you pull the TA lever back, the sprague clutch has failed. You still can use the tractor in high range indefinitely without damaging anything further. If the TA works in both ranges, that is no guarantee that the sprague clutch will stay locked up under load. When TA"s start to fail, there is usually a period of time where the low range will work part of the time, and not work the rest of the time, before you lose low altogether. Even if it does work, I would avoid using low when going up hill, because the sprague could release part way up and the tractor would be free wheeling at that point. Also, by design, there is no engine braking when going down hill in low range, so always keep it in high on any hills. I have re-built a few of these over the years, but not in a while. I think you could expect to pay between $750 and $1000 for a re-built unit on an exchange basis.
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Today's Featured Article - Tractor Profile: Ford 600 Series - by Staff. The Ford 600 Series tractors bean production in 1954, and continued until 1957. Quite similar to the Ford NAA (Golden Jubilee) in design, it used the same 132 cubic inch Red Tiger engine with 31 horsepower. Several different models were made in the 600 Series, and these numbers were used to denote whether they used a particular transmission, hydraulic system, or PTO. The result was five different model numbers: 620, 630, 640, 650 and 660. These break down as follows:
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