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Message: <blockquote data-quote="JustAwrench" data-source="post: 1098" data-attributes="member: 178"><p>There's no practical way to drain all the hydraulic oil. I drain at the lowest part, change the filter, fill it and call it good, unless there's some obvious contamination like water(milky oil)or someone topped off with fuel. Then I get a little more invloved but short of complete disassembly, you can't drain it all.---One thing about pumping out from your auxilliaries-you can damage your hydrostats doing so and the extra oil you push out is not, to me, worth the risk. The drive motor case drain line is a good place to drain from, but the motor covers on the 743 are a PIA to remove and reinstall.--Let me know if you want my contaminated oil change procedure. I buy 3 2.5 gal jugs of Black Gold for the Change and give the cust the rest, usually half a jug or so.</p></blockquote><p></p>