You mentioned that it has "good pressure out of the pump". Where and under what conditions was this measured? On an open center system like this there should be essentially no pressure developed anywhere until the valve is moved to port the oil to the lift cylinder. Otherwise the oil is in full by-pass and is being routed back to tank. If pressure builds up to relief (a little over 1000 psi) between the pump and valve when you move the lever to lift and the rockshaft doesn't go up there would have to be something preventing the oil from getting from the valve to the piston. If pressure isn't actually being developed the problem could be the relief valve or the pump itself.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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