Ambush is the expert here on hydros so maybe he'll weigh in.
I'm somewhat familiar with them. The hydro won't work if the charge pump cover is reversed from the factory orientation, the charge pump cover o ring is pinched or missing, or the relief valves are faulty, the hydro is otherwise damaged internally from towing, lack of sufficient hydraulic fluid (low level, suction leak, plugged filter) or any of a couple other reasons.
charge pump output should be about 600 psi. If it's only 50 psi, maybe that's the issue?
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