Rusty and Jim, you are both thinking "old school" with the MECHANICAL TA found on Super MTA, 300, 400, 350, 450, 340, 460, 560, 660, 504, 606, 544, 656, 666, and 686 tractors, for example.
Any other tractor with a TA has a HYDRAULIC TA, which is completely different from a mechanical TA. There are too many to list, but all other 06, 56, 66, 86, 3X88 and 6X88 series tractors have this type of TA.
Believe what you will, but the fact of the matter is, the hydraulic TA is most certainly meant to be used as an extra gear. mazemeister's explanation of the way the mechanism works is an excellent one, and indicates that it is actually LESS wear in TA speed with a hydraulic TA.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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