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It depends on the following variables: 1) Condition of the belly pump. If it's a late H, or has the improved setup, it can develop about 700 psi. If someone has shimmed the relief valve spring, it might even hit 900 to 1000 psi. 2) Diameter of the cylinders. A 3" diameter cylinder has a surface area of about 7 square inches. A 4" diameter ram has a surface area of about 12.5 square inches. Multiply the surface area times the psi from the pump, and you have the theoretical force the cylinder can develop. If you have two cylinders, then you can push with twice that force. 3) The geometry of your loader. If the tops of the cylinders are located closer to the bucket of the loader, it should lift more than if the cylinders are attached farther back on the arms. The angel of the cylinder to the loader arm can also affect this. In theory, if the cylinder is about 90 degrees to the loader arm and mounted close to the center of the distance from the lift point to the rear arm attachment, then the loader could lift about 1/2 of the total force developed by the two cylinders. If the hydraulic system is in really good shape, and you have loader cylinders in the 2.5" to 3" range, you can lift enough weight to literally ruin your tractor. The rear end will also become very light.
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