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Just to be clear, the PTO ( power take off ) clutch is only used to power the deck. The tractor drive wheels are powered by a different belt that drives the tranasxle. This drive belt is engaged by a spring loaded idler pulley that is disengaged when the clutch pedal is depressed. As stated above, there are several problems that could cause this drive line to lose power. I would connect the rear of the tractor to a tree or vehicle and then put the tractor in 3rd gear and gently engage the clutch while a second person watches the transmission pulley and belt. If the belt is moving and the input pulley is turning but the tractor wheels are not turning, the input pully key or one of the wheel axle keys may be missing or damaged. If the belt is not moving, the belt may be worn or the idler pulley belt tensioner spring may be broken. Read this thread to get a good understanding how the tractor drive train operates .310-8 Clutch Problem - Transmissions and transaxles - RedSquare Wheel Horse Forum