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Message: <blockquote data-quote="skidsteer.ca" data-source="post: 7158" data-attributes="member: 307">On the old Boss system there is a number that follow the code that helps indicate the specific problem, Do you know what code (codes)  it throws.  Believe the ones with the lower #s are serious ones that cause shut down.  It could be as simple as one of the hydraulic filters.Has he put a guage on the charge pressure to see what it reads?The sensors read the charge pressure going into and out of the filters. there need to be a minimum pressure and not to much difference between in and out.Put a guage on each side and check at various rpm. I cured a code on a 753 by just tightening the screws inside the boss holding the circuit board. But it was throwing jibberish codes as a result of a bad ground.Worn sensors, bad grounds and coroded or broken wires will play havoc with the boss.If the problem is constant and predictable (which it seems)   it does sound like a sensor or a filter/ flow restriction problem Ken</blockquote>