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Message: <blockquote data-quote="TriHonu" data-source="post: 28028" data-attributes="member: 897">You should use 3/4" inside diameter (id) hoses or larger from the loader to the open center valve and back to the loader.  On systems operating at 2000-3500 psi you don't want to the fluid speed to exceed 20 feet per second.   This equates to a minimum of 9/16" id for a system with 15 gal/min.  This is to minimize heat build-up in the oil due to friction.Bobcat plumbs their attachments that need continuous flow (snow blowers, planers, mowers, augers, backhoes, etc) with 3/4" id hoses.  Attachments that use the hydraulics intermittently (grapples, 4in1 buckets, etc) tend to be plumbed with 1/2" id hoses since heat build-up is not a major design consideration.  I have seen 4in1 buckets and snow plows plumbed with 1/4" id lines to restrict hydraulic flow making the attachment more controllable. At 15 gal/min a 4x24" cylinder should fully extend in just over 5 seconds. Retraction will be faster since less volume is required (cylinder rod takes up volume).</blockquote>