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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