I did the rebuild about a month ago and everything had been going ok until yesterday. I was driving down the road and heard what sounded like a rock being thrown in my car. I later found out that the nut holding the pulley onto the power steering pump came off. As i was pulling into a parking lot the steering became hard and it felt like there was grinding. I opened the hood to find the pulley off the shaft. The teeth on the power steering pump shaft and the teeth on the pulley were stripped. I don't know what caused it. I thought maybe the bearing failed but I can still twist the shaft fairly easily so I don't know if it possible that the orings inside caused some failure/seizure of the pump or I had the belt too tight. My problem now is that I need a new pump and pulley. The refurb pumps at o'rielly don't come with pulleys and the dealer doesn't sell pulleys separate, only with a new pump. Anyone have any ideas on what caused problem and/or any suggestions on what to do?