gravely 252 xdz leak..please help!

[woodlawnservice]

I've got a gravely 252 xdz with 400 hrs. I've developed a very small leak somewhere and cannot find it. Its causeing my main hydraulic belt to slip causing the mower to not move or pull itself. I clean everything with degreaser and it runs and operars fine... for a few days then it gets oil on belt again. How can I track down this leak? The oil and hydro fluid r both oil so they physically look the same. I noticed when hoses goes into.top of left wheel motor that more oil gets there... not sure how it gets on belt from there... I've tightened fittings as tight as I can but still is leaking somewhere...
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