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 - Restoring a John Deere 2010 Diesel Tractor - by Jim Nielsen. Following seven years working in California's Silicon Valley, my wife, baby son and I moved back to Australia to retire. We bought a small 'farm' of about 50 acres near Bendigo, in the state of Victoria. I soon found that it would be very useful to have a tractor around the place for things such as grading our long drive and brush-hogging the fields. I was also embarking on planting 1000 eucalyptus trees, and hence I would need a ripper, small disk plow, sprayer etc. to get these things accompli
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