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Message: <blockquote data-quote="Kilroy2k1" data-source="post: 61006" data-attributes="member: 2002">I had the chance to pickup a M600 for parts that i needed for my M620. The owner had issues with the hydraulics, drive issues and poor starting. After further inspection I really think this unit is too good to scrap. I've already sorted out most of the drive problem which needed the clutches backed off and new seals in the variable speed pully.   The var speed pully is run off the hydraulics with a lever by the seat and when i move it the pully only closes up about 1/2" and will not close any more. There are no more leaks in the system with the new seals, the springloaded side of the driven pully slides free and the hydraulics will lift a bucket of dirt, albeit a little slow and jerky.. Anyone familiar with the 600's var speed system? Is there a pressure relief in that part of it or could it just be bypassing inside the var speed valve?Tom.</blockquote>