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Message: <blockquote data-quote="Mike10" data-source="post: 45053" data-attributes="member: 5461">I think you are on the right track with the relief valve.  The hydralic pump is flowing oil or you would not be able to drive the unit.  Whether it is up to specs is another question.  The charge pressure oil comes from the return hydraulic oil from the control valve via a check valve.  If the electronics was the problem you should hear the  engine labor when the oil goes over relief.  The only place for the oil to escape, in the volumn you are describing, is through the relief valve or a massive crack in the control valve.  The only way to narrow it down for certain is to use a flow meter and guages.Did you remove the screen from the standpipe next to the hydraulic pump and clean it?  The hydraulic pump input hose is attached to the standpipe.</blockquote>