> If the cylinder is allowing fluid to pass around > the packing on the piston, the fluid simply > moves from one side of the piston to the other, > allowing it to sink back into the cylinder.
As the piston sinks into the cylinder the shaft follows it, taking up some of the space formerly occupied by oil. Draw a lengthwise cross-section of a fully extended cylinder and a fully retracted one. Compare the two drawings and it will be obvious that there is less room for oil in the fully retracted one. Thus in order for the cylinder to retract some oil must leave it.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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