Those are called displacement cylinders. There is a seal at the end around the shaft, and the "piston" is just a guide. When oil is pumped into the cylinder, the rod has to move out to make room for it. The advantage over a sealed piston appears to be simplicity, only one set of packings, and a rod nearly the size of the cylinder, for increased column strength.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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