ZoomBoom Carelift Hydraulic accumulator issue?

Hey guys I have an old Zoom boom Carelift getting a bit of an overhaul in the shop, I having a hydraulic issue that i don;t understand, i'm quite an amateur when it comes to certain hydraulic problems, anyways the problem i am having is a pulsating hissing noise like a pressure release from the pump leading to the hydraulic steering box, it shakes the whole machine while operating the boom and i suspect it may be dan

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