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Mini Excavator 301.8 Lost Hydraulics

I just bought a used 301.8 mini excavator for cleaning ditches and springs on my farm.

On my first outing machine running fine.  started to back away from my job and had to do some tight manuvering to clear my spoil pile.  As I got the manuvering done  I lowered boom and lost all hydraulic power.  Engine fine.  Looked in site glass saw hydralic fluid low, granted I was sitting on slight angle.    found no fluid leaks.  Topped off hydraulic fluid.  Nothing  still no function.  I have tested the arm safetys by lowering and trying to start they worked properly.  I have checked all fuses.    Anybody got any ideas?