Question about Watts Onan Portable Generator - 4000 , Model# 5500

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Onan 4000 RV Generator - where is the oil drain plug?

Where is the plug to drain the oil on an Onan 4000 Generator? My manual just has an arrow pointing to the bottom, but there is no access. I think it looks like it is near the dipstick, but it is a female plug. If it is, what kind of tool do you use?
Thanks - LXILABS.

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  • Anonymous Mar 12, 2014

    will not start

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It should have a cover on the floor bottom that is held in place with two torx (star) screws. remove the cover and you can remove the plug with a 9/16 socket.

Posted on Dec 02, 2008

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