I think you're getting a lot more than 3.7 GPM. I thought Williams pumps like that only ran about 1000 RPM max? Looking at your picture, I think you need to put a much larger sprocket on the pump to slow it down. The way you have it with a smaller pulley, you're speeding it up. A smaller hole for the oil to go through may put excessive back pressure on the system and cause damage. Another option might be a priority flow divider that you could just divert excess flow back to the tank.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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