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Message: <blockquote data-quote="hmw" data-source="post: 4224" data-attributes="member: 597"><p>I'm going to change it to 10w30. Other Pieces of equipment i've worked on use 20w50 synthetic motor oil in the hydro units so 10w30 sounds right. Yes the hydrostatic drive works fine. No noise and not jumpy. It does not have a suction filter only a return one. I Re-hosed this machine earlier this year for the fellow i ended up buying it from. The hose from the tank to pump is only about 24" long. One thing i do not like about the hyd system on this is the return line dumps into a "run" tee at the bottom of the hyd tank. In other words the suction comes out one end of the fitting and the return dumps into the side of the fitting. If any air in the system, [foam] it would get sucked right back into the pump. Also the return oil never gets to the tank to cool. I work for an electric utility and repair all kinds of bucket trucks, digger derricks etc. I have never seen a return ran like this. But it must work, the way the tank is there is no other port to run it in. I think I'll try the motor oil, Not confident it will make the hyd system less jumpy but doesn't hurt to have the right oil in it. Thanks for your reply, I'll let you know how it works out.</p></blockquote><p></p>