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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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