Never had a problem with this, then today.....tractor stopped moving. PTO working fine. When I select a gear ( any gear) and move shuttle either forward or reverse, the tractor does not move. I can feel the shuttle selector grabbing forward or reverse. Also, I can feel the detends when selecting a gear. Now here is the confusion. If I select a gear, and engage the shuttle, tractor does not move. If I press down on the clutch, the tractor tries to move. ( if I put in 1st gear it will actually move a little) In addition there is a noise coming from trans/clutch area. Kind of a sketching noise. I checked fluid. All good. Any suggestions? Tractor has 1850 hr. Never had any othe issues. I service it regularly