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Message: <blockquote data-quote="Tazza" data-source="post: 14551" data-attributes="member: 82">All good points. The case drain hose on my 751 connects to the bottom of the hydraulic tank, so there is no pressure here. With the use of a shuttle valve it can be hooked up so the high pressure side never touches the case drain, when you reverse flow the valve moves to divert the flow to the correct side. I don't know the pressure that is on the return line though, but i know there is a little bit there. As for needing the case drain for cooling, there is leakage in the system to allow for this, and the case drain lines *should* have a very low flow. If there is excessive flow, you have a problem.I will need to look into this a bit more as i have a hydro motor i want to use for a concrete mixer. It has a case drain and i was hoping to use a shuttle valve to prevent me having to plumb in a case drain line......</blockquote>