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Message: <blockquote data-quote="skidsteer.ca" data-source="post: 25470" data-attributes="member: 307">On the NH there was a plug in the hydraulic valve for hi flow pump oil to join the flow after the second spool, #1 and #2 were for the boom. This way the 2nd pump only went to the couplers. Also when spool 1 or 2 is working the boom the second pump continues to supply the attachment by itself (as opposed to combined with the first)If you go over about 20 gpm you should have 3/4" lines and couplers for the boom. You would also want to keep a eye on oil temps as some hi flow machines get bigger coolers (may not be a concern if you are in the snow belt or using it in winter only)I would send the flow from the standard pump to a electically controlled valve and combine it with the second pump there, if you plumb it all into the original 3 spool valve you will want to check the back pressure it be sure the valve can handle all the flow.Ken</blockquote>