My tractor started whining like the throwout bearing was going bad then it just stopped pulling. The 3pt hitch would no longer raise either. Trans fluid appeared to be up to normal but no matter what gear I use it will not move when the clutch is let out. After it cools off for a while it will move for a short distance then stop again. The 3pt hitch will raise and lower a couple of times then it quits again also. The PTO continues to work this whole time. Any ideas?