Here's a primitive set-up using a hoist pump to make a dump trailer. Local truck mechanic said the 8 HP briggs wouldn't spin it under load, so I geared it as low as I could with weld-on sprockets from the local farm store. It raises it easily at just above an idle, and seems to raise at about the same speed as it would if powered by the truck engine. I don't know the pressure, GPM, or RPM's. It's a twin post hoist, but single stage cylinders. I don't remember ever seeing two stage cylinders on a truck hoist. I've added another board to the sides to hold more wood, but I have never weighed it to see what it's dumping. In your case, you may need more volume and pressure. I picture what you're building is a stand-alone pump to free up a tractor. And like Greygoat said - a bigger tank would keep the oil cooler. This thing probably doesn't run but about a minute at a time, so cooling isn't an issue.
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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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