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Message: <blockquote data-quote="TriHonu" data-source="post: 14530" data-attributes="member: 897">Case drains are used in pumps and motors to allow slippage and seepage oil to exit the case and  keep the seals from blowing out.  If the oil in the case behind the seals gets to as little as 15 psi it can blow the seals.Case drains are designed to return oil directly to to the reservoir with minimum restriction and should not be combined with other return lines. They should be connected to the reservoir through dedicated penetrations. This penetration should be connected to a drop-pipe inside the reservoir that extends below minimum fluid level.Bandit1047 hit the key point - If this stump grinder has a case drain it is most likely a high flow grinder.  Running it on a low flow machine will result in the cutting wheel turning much slower than needed to cut efficiently.  You will probably be able to get it to tear away some wood but it will operate less effectively than a grinder designed for low flow.</blockquote>