Just bought a home with some acreage and figured I'd need a tractor. Bought a Super 55 because it seemed way cooler than anything else I looked at. Got it home- found a problem- NEED HELP! So checking the tractor out before buying it it seemed to pass all of the tests- pto disengaged, all gears worked great no real leaks that I could see and hydraulics worked great. got it home- pto didnt really want to disengage all the way this time. Hydraulic fluid looked lower than last time I checked- I went looking for the leak. 
the belly of the tractor... the pto clutch inspection plate (that I didnt even know was there) was missing and fluid was obviously leaking from it, but it wasnt leaking hardly at all- why u ask??? because the case is packed FULL of SAND (and shell). greasy SAND! Tractor runs perfect, shifts great, pto works, but I wont run it until I flush it with diesel tomorrow to try to get the sand out. This is my first tractor, and I've never worked on one before btu I have done some in depth auto repair.

Can I get some advise?? please... Thanks to anyone in advance for their help!