Maybe I asked the wrong question,I was looking to maybe replace the s/g I had and saw it had a model number. I went a different rout though. What happened is the nut holding the pulley on had come off without me knowing. The shaft and keyway were destroyed as well as the bore thru the pulley. I took it to work and welded up both the shaft and the pulley and remachined them. The s/g still sounds like it has a drag on it but it did start the tractor and is charging. Anyone have any suggestions as to why it would sound like that? The brushes and bearing are new.