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Message: <blockquote data-quote="thetool" data-source="post: 14601" data-attributes="member: 1534">I have before plumbed a direct return line on such a machine.  It was as simple as welding on an extra bracket on the end of the boom for the coupler, running the extra hose up the boom and finding a place to tee in before filter/cooler/tank, but after the valve, which was a return line to run a hand-held hydraulic breaker.   The return line going through the valve resulted in back-pressure that stalled the breaker.   Such a set-up would provide you with a case drain circuit, BUT......As others said:Your Bobcat stump grinder is a high-flow attachment, and needs I believe in the neighborhood of 30+ gpm or you won't be satisfied with the results.  Whoever sold it to you should have verified your power unit.  If your bobcat does not have that extra coupler, it is not a high-flow machine.Good luck.</blockquote>