The big question is, how much torque does a PHD require?
You might be able to go to the mfg, find out what the digger is capable of handling, get a ballpark figure from that.
With that information it's all math. Not easy, but start with what you have (the Case pump), determine what the GPM @ x RPM is, and the pressure rating. Next match a motor to it that will give the desired RPM (flow rate) and torque (pressure rating). The 2 go hand in hand, smaller displacement=higher RPM=lower torque, higher displacement=lower RPM=higher torque. Don't forget you will need a reservoir sized to handle the heat dissipation, a directional valve, pressure relief valve, filter, suction strainer, hoses...
As you can see, this see this can get very expensive. Mistakes can be devastating! A good shortcut would be to visit some equipment showrooms, write down model numbers of the components they use, take pictures, steal ideas. All of these components can be found used or discounted online. A hydraulic shop can help engineer this, but would not be fair to use their knowledge and not buy from them, (my opinion).
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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