Your belt may no longer be fitting after all you've replaced. Check your belt tensioner to see if the tension is still within range. You may now need a different size belt.
Check that the new pulley fits your belt and that ALL pulleys are aligning with each other. If one pulley is a little off that will be enough to throw the belt off. Also check that all pulleys are still tight and not a little loose.
Check that the new pulley fits your belt and that ALL pulleys are aligning with each other. If one pulley is a little off that will be enough to throw the belt off. Also check that all pulleys are still tight and not a little loose.