Hey all, hopefully someone can give me advice. Recently bought a used B7200 hst 4 wheel drive. The hour reading was 192 hrs. and the tractor was as clean as a brand new one which tells me it was well taken care of. The first time I used the tractor for about 2 hours it ran like a charm. I then hooked up a box blade and proceeded to grade our rocky driveway and had been at it for about 4 hours when I returned the hst pedal to neutral and dropped the box blade and nothing. The tractor would not move in forward or reverse. I checked the high low shift and it was in low. I checked the hst fluid and it was a little low, added about a qt. of fluid still wouldn't move. Following day drained the fluid, cleaned the screens{2} fluid wasn't that dirty although I did find a few very small metal filings in the fluid. Also changed the hst filter. Still nothing. Have read on the forum about the noise the hst makes in the B series all I here is the diesel motor. It's like the hst isn't working. I know more about kubota tractors after reading the post on here these last 3 days but not enought to fix this problem. Please if you have any ideas let me know otherwise I have a very expensive yard ornament, I look forward to your responses.....