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Should the relief valve release pressure? I thought they would check the valve pins to see if they were sticking, but instead they maxed psi pressure or maybe put shims something other than maxing out the psi, the backhoe only has 300 hrs and the previous owner had some hose's replaced on it ...

Low power, the dealership increased psi , what is max psi on this unit and what could happen if pressure is over max?