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Message: <blockquote data-quote="brdgbldr" data-source="post: 121184" data-attributes="member: 7474">The only way to get all of the oil out of the system is to remove all the lines. Even then you will have to cycle the cylinders and turn the pumps and motors to empty them. It sound like all of the hoses and tube need to be replaced so this would be a good way to go.The next best option would be to put in new oil, cycle everything on the machine, several times, and then repeat over and over until you are satisfied the oil is ok.You can use hydraulic oil instead of motor oil like the old manual says. A good AW46 or ISO46 would work depending on your climate. As old as that machine is I would just go with a cheap brand like NAPA. It's usually around $55 for 5 gallons of AW46. Hydraulic oils have additives in them that help the hydraulic system like water separators. Motor oils have completely different additives That actually keep the water suspended. Oils have changed a lot in 40 years.You should probably just replace the ignition switch. They are cheap and, in my experience, go bad more often then they should.Not sure about the drive. Could be to motors or the hydrostatic pump. Like you said though. You may be trying to pump old oil or, more likely, water through the hydrostatic system. Oil floats on top of water. So if this machine was sitting that long the water would work it's way to the lowest points which would be the drive motors.Sounds like a fun project.</blockquote>

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