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I made a log splitter once using a Koehler 18 hp industrial engine. That sucker would crack anything! If you get a hyd pump for the PTO there should be no problem making one if you have access to welding equip. and thick guage steel. I used a 5"x24" cylinder with a 2-1/4" ram. The pump was rated at 1500 psi @ 3000 rpm, I believe. Don't get a ram less than 2" diameter. My pump was a single stage pump. A 2 stage pump is fine, but it will slow down when it meets resistance. A 2 stage pump will allow a lower flow rate specification for the pump by sacraficing cycle time. Make sure your getting at least 12 tons splitting force and a fluid volume high enough to give the desired cycle time on the ram. You don't want to be waiting forever while the ram extends. 3.1416 X cylinder radius squared(") X PSI / 2000 will calculate the tons of force. 3.1416 X cylinder radius squared(") X ram length(") / 1728 X 8 will calculate the gallon capacity of the cylinder. (2.2 gallons for a 5" cyl) If the pump puts out around 1500 psi (2000 psi for a 4" cyl) with a fluid flow of about 8-10 gallons per minute, you should be fine. Use a filter canister on the return line. 5 gallon fluid tank would be fine.
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