Not saying I'm an expert, but... I did work in a hydraulics plant for 38 years with 25 of those in the engineering experimental lab, building and maintaining test machines, and modifying customer equipment to incorporate our hydraulics.
1. Return your open center valve to somewhere in the lower reservoir... not at the suction port to the pump... you will be recirculating the hottest oil.
2. No need for a screen between the two reservoirs... what good would it do there if your return is to the bottom one?
3. A screen in the suction line from the lower reservoir to the pump is a great idea... filter on the return line from your valve would also be good.
I take it you need the extra volume for displacement in a cylinder(s), so all it needs to do is raise and lower the level in the reservoirs, so you don't cavitate your pump. Pump cavitation under pressure can be as damaging as any other contaminant... the higher the pressure the worse it gets.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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