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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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