D23F - clutch/transmission problem?

[llh4160]

While moving snow, tractor came to a complete stop. No tire spin at all. Didn't smell the clutch burning or feel any jerking in the drive line. Now, tractor will not move unless the 3 speed selector is in low range, no matter what speed the transmission is in. Any help or ideas on where to look first would be greatly appreciated. Thanks

[Jls6464]

Check the linkages. These tractors are fickle about positions. You may need to change the hydraulic oil and filters as well. That's where I would start.