There are splines on the crankshaft and splines on the electric pto clutch, sounds like they are worn off. That's what is making the sound. There should be adaptor for the front of the crank. You might have to buy a new pulley and cut the end of the crank off. just have to remove hood and radiator to get to the front of the engine. I have done this before and it is not that bad of a job to do. as for the pto clutch you will fine out what all you will need to replace after you get it off. It might be just a small drive shaft. Hope this helps.