I remember Dad had an "expansion tank" on a Farmall C with a loader, but all it did was cycle the level up and down in the upper tank, with the return to the factory internal tank.
You might trade the 90 elbow in the top of the lower reservoir for a tee, standing up so the port going to the upper reservoir is still plumbed like you show, and a return line filter and return flow go back in the top of the tee. This might gain you a little edge over returning to the top tank. Chances are, you will not be extending your cylinders all the way, all the time, so it might not be a serious problem.
A lot will depend on how fast your single acting cylinders retract and how large the diameter is. Large cylinders dropping fast will dump a lot of flow real fast back to the reservoir. If this happens, you may need to meter the return so it doesn't "overload" the 1" fittings and force a large portion of the oil into the top reservoir before filling the bottom one.
This post was edited by IH fan at 08:55:08 01/20/11.
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