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Ted, I have a 1170. There are two things that can keep the output shaft turning. 1. the friction drag in the clutch faces and 2. high drag in the pilot bearing in the flywheel. If the clutch action seems normal i.e. no sudden change, the pressure plate is probably backing away from the clutch disc as it should. Also normal clutch pedal action would suggest the clutch facing has not broken up and wedged itself. The clutch disc friction face could be held against the flywheel face if the female spline in the clutch plate cannot freely slip on the output shaft male spline. This would keep the output shaft turning. The spline may be galled or it may be worn with a step or notch on the male spline teeth. A sudden problem suggests the pilot bearing may have ceased up or partially ceased up. Spline problems usually give some warnings or indications over time. Bearing ceasure can be sudden. You might figure out a way to SAFELY crank the engine (no fuel) in gear with the clutch pedal depressed. If the engine turns and the tractor does not move, turn on the fuel and start it in gear with the clutch depressed. Again, be very careful because the pilot bearing could weld itself and cause the tractor to move. This action could also free up the clutch and get you through the day.
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