To shut your pump up, drain the current fluid (or at least a good bit off it) by slacking hose at front of engine, where flexi from subframe attaches to metal pipe thats attached to engine. Then get decent fluid, dextronIII anyway, get a good quality one, and fill it up (after reconnecting pipe), with wheels off the ground, or on soft grass or something, turn steering lock to lock a few times, then check level. I have found that doing this (and ensuring aux belt is tensioned correctly) returns the pump to silence, at least for a good while. Mine used to be noisy but aint heard a peep from it recently