But when it gets to the other side it has nowhere to go but out. As the piston slides into the cylinder the shaft follows it. Thus there is less room for oil when the cylinder is retracted than when it is extended. Therefor, oil being incompressible, the cylinder cannot retract unless some oil leaves it (ever run across the instruction "Check level with all cylinders extended"?)
What does happen is that as oil leaks past the seal the pressure in the two chambers of the cylinder equalizes. The load is then being effectively supported by the cross-sectional area of the shaft rather than that of the piston. As a result the pressure goes way up, forcing oil past the check valve (which is probably as old and weak as the cylinder seal).
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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