Makes banging sound during agatation cycle, tub and agator both rotate back and forth.

Lift the top cover of the unit from the front of the unit once it is free from the front locking clips, which hold the cover in place. Two things you need to inspect for damage. 1) You should see four rubber straps, which should restrict the movement during the wash and spin cycle (cost is around $4.00 each). 2) Check the shocks on the tub support rods and plastic hardware for damage.