I have cleaned up both pulleys, the one from the gear box and the large one on the transaxle. The belt tension adjustment is adjusted for maximum release on the belt. With the engine off I can get under the tractor and pulled the clutch pedal down. The belt goes slack and I can turn it around the pulleys by hand real free. When the engine is running the belt continues to turn the transmission pulley. Have to turn the tractor off, put it in gear, then start the tractor. The clutch pedal has to come up a ways before it starts to move the tractor so I think I have that adjustment correct. Any suggestions as to why this is happening and what can be done to correct it ? ?