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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