vibration noise whirlpool duet front load washer GHW9400PW

worked fine then suddenly a knocking sound srarted in the spin cycle. any help appeciated
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Is it new? I had a new one that constantly vibrated. Turned out cabinet was poorly welded or damaged in shipping. Machine was replaced.

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If you remove the kick panel with a torx bit (3 screws), you can check for anything unusual going on. Make sure that all 4 shocks are doing their thing. If you have a loud knock in spin, you could easily have a problem with your main pulley.
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On those duets make sure that all 3 torx bits are tight because it adds stability (albeit a little) to the unit. Also if it is on a pedestal ensure that there is a rectangular plastic tab under each corner-this isolates the rigidity to the 90 degree corners instead of the flexible sides. If they are not there they could be in between the dryer and the dryer pedestal as installer could have made a mistake. A 9400 would probably be too new to have a spin bearing problem already. Make sure that you use HE detergent with that and a fraction of what they advise. If you are not using it make sure that you don't have regular detergent visible if a factory tech comes out because they are able to void warranty if they don't feel like working on it! There are also shocks on the bottom. It's doubtful but one could be separated or even broken. Another possibility is that there are some cement weights that add stability. I have seen these break at the bolt locations. You'll need to get a service tech out for that as it's quite a job. Whirlpool may cover even if it's over a year. It could be "oil-canning" / when you hear the noise put your hand on the side and see if the noise stops. There are some foam pads between the stabilizer bar and sides that could be missing. Good luck!
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