I have series 80 washer. During the spin cycle it makes a loud whiny noise. I checked below and a belt was loose and it felt worn out. If this is the problem, how do I replace the belt?

Before replacing the belt I should check the pulleys first. Many times they go bad and will cause that type of noise. If you do replace the belt and need instructions, post back. It is not an easy job on Kenmore, but I can give you step by step instructions