[Cooper]

Think of it as a pressure release (like a pop off valve) the pump sends pressured oil to valve block AND to the pressure release valve (regulator) when the cylinders are maxed out or no valve is open, or digging pressure is maxed out (like hitting a big rock) then all that pressured oil is diverted to the p.r.v. That is what you can call the regulator, can adjust pressure limit to where you want. I would suggest to get a gauge and see if you are getting enough pressure. Worse case is you would pop a hose off or burst one if pressure is too much. (I would think the hoses would go before the valve seals ?) and think how the cylinders work, only one end has pressure at a time, the other end is just being pushed out and returned to tank. Do you have a gauge? It might be as simple as you just don't have the prv set to enough to pressure and that's why it seems like no power.