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 - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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