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Message: <blockquote data-quote="sterlclan" data-source="post: 7099" data-attributes="member: 45"><p>On my 630 I just changed the hydraulic pump, the bronze filter, hydralic filter ,and all the hydraulic oil my charge pressure is around 100-150 cold or with no load add a load and some heat and it will drop to less that 30 as soon as you let off the handles it comes right back up bucket functions don't affect it much replenishing valves? bad hystat?or would the rotating groups do this to the pressure? ..............Jeff</p></blockquote><p></p>