Sometimes it amazes me how these con artists live with themselves! Got a call from a landscaper that I serviced the Bobcat last year, it was making a clanking and clunking noise that sounded like metal scraping metal. He took it to a few people who gave various excuses from a bad hydraulic pump to a water pump, to a bad turbo (LOL). Turns out it was the alternator pulley comming loose. Keyway ate up the shaft and nobody was open for a replacement. As a last resort I welded the shaft and cut a new keyway, and installed a new key. Put it all together- noise gone. Probably not the best repair, but he was in a hurry. The pulley sheaves seem to fit tight on the shaft but the keyway is a bit worn. This is almost as crazy as the whistling Bobcat with a bad head gasket.