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Message: <blockquote data-quote="dfb" data-source="post: 128219" data-attributes="member: 11792"><p>For the topic of conversation, as it may not be practical to do this, drain the hydraulic tank as much as possible then get the return line off at the hydraulic tank and extend it into a catch can and pug off the return port at the tank. Refill the tank with your new oil of choice and have plenty of new oil on hand to keep adding to the tank as you operate the machine through it's different operation modes. Having it jacked up on blocks would be beneficial to flushing the drive system. The object of doing this flush method is that the new oil only makes 1 trip through the system as it picks up the contamination. Once you are satisfied what is coming back out the return line is free of gas reassemble the system and install new filter/s. HTH.</p></blockquote><p></p>