COM is a torque converter drive just like in a car or pickup. When locked it pulls just like a dry clutch, but when in com it slips like any torque converter drive. So there is no actual shift or speed change, just the slippage you get from the converter. They worked very well for tillage as it was almost impossible to power out as they just continued to slow til you pulled through. Also worked good for things like silage chopping as the torque converter kept the engine perfectly in the power band even with varying crops. Made the tractor do the work of one size larger tractor. I would think they would be almost perfect for this type operation as the speed could vary a lot with little change in pto speed.
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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