Hydro fluid in motor oil?

[Jethro]

I checked the oil in my Kubota B1550 this morning before using it, and it was at the full mark. After running it for several hours, we noticed that oil was dripping from the breather tube. I checked the oil and it was thin, lighter, and well above the full mark (about twice as deep on the stick as full should be). It doesn't smell like diesel, and it is not milky looking. The coolant is not low. The hydro oil is about 1/2 way to the full mark. I didn't check it before using it today. Can the hydro oil get into the engine from the power steering? I cant think of what other fluid it could be. If so, do you have any recommendations for repair?

 

[Leejohn]

From power steering no, from the hyd pump shaft seal.