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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