well it sounds like you may have a worn snubber. one thing to look for is is the tub listing to one side, usualy the right and to the rear. the next thing to check is for a white powder (worn snubber residue) inside the cabinet.to check it, remove the front of the cabinet. using a putty knife. push in the reatiners located between 2-4" from the outter edges of the top. and lift up. then at each corner (you may have to push the tub back) look inside and towards the front there are 2 5/6" screws. unscrew and bring the top front down to about a 45 degree angle then you can lift the front off. look around the base for that snubber residue. if you see it or the tub is listing to the right its a difficult job to do with out the proper tools and could entail basicly pulling the whole lower washer apart. check thigs out first an post your results here
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