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Message: <blockquote data-quote="skidsteer.ca" data-source="post: 14128" data-attributes="member: 307">Hi flow is definitely switchable. If you search online for for "hydraulic hp formula" you will get an equazion you can plug the figures into. 16.9 gpm @ 3000 psi is about 27 hp that you can put to you attachment on a standard flow 773, s185. You'd have to do the math to see how much hp you'd gain with various hi flow machines. I would think they would be up in the 40 hp range.Also pressure is vary important here too, not just gpm (flow), as the pressure is what produces the steady torque that attemps to maintain the rpm of something like a stump grinder. Ken</blockquote>