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Bonehead question

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Posted by Rick in Cincy on September 03, 2003 at 09:30:13 from (

I'm a beginner mechanic and I did a stupid thing. I'm in the process of changing the engine and hydraulic oil and filters. I originally mistook the front hydraulic drain plug for the engine oil plug. So I drained a bunch of hydraulic fluid, changed the engine oil filter, then added eight quarts of engine oil. Since I had unknowingly failed to drain the original engine oil, I then had twice as much oil in the tractor as it is supposed to have! (stupid, stupid, stupid) Fortunately, I noticed my mistake before starting the tractor and drained out all this oil. Did that harm anything? Is there anything else I need to do before refilling the oil?

I also have a related question. My tractor is a Kubota M5700 w/ 4WD, and the manual indicates two drain plugs for the hydraulic fluid. There is a third plug that sits about one foot further towards the back of the tractor, and I can't find any description for this plug in the manual. It is a little smaller than the other two hydraulic oil plugs (19mm instead of 25mm), and it looks like it is on the same hydraulic oil pan. Is this actually a third hydraulic oil plug, or is it something else?

I'm not asking out of idle curiosity. As part of my stupid drain plug misidentification, I also removed this plug. It appeared to just drain out a little more hydraulic fluid, but I'm obviously no expert on the subject.

I'd appreciate any feedback.


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