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Message: <blockquote data-quote="Lowe.Buuck" data-source="post: 113478" data-attributes="member: 15208">"you can see i ran a 1 inch line from the case drain.. i needed a check to stop the flow of fluid from going back into the pump case."From the last picture, it looks like you connected the case drain to a tee in the "Return" hydraulic line. Case drains are designed to be plumbed directly back to the hydraulic tank.In your case that "Return" Line is the pressure line when you reverse the flow. When that occurs, you are forcing 3000 psi fluid in to a motor passage that is not designed to contain anything more than very low pressure.You either need to plumb a proper drain line to the tank or as suggested, add check valve with a low cracking pressure at the tee to prevent pressurized oil from entering the case drain on the motor.Note with the check valve installed, you can run the motor in reverse, however the case drain will functionally be capped off (no case drain functionality).</blockquote>