I posted a similar thread awhile ago but cant find it. Sorry if this is a repeat.
The 3000 and 4000 Neptune models have that distintive sound during the tumble action of the wash. I have a few 7500 and 5500 models that have the same board and motor but do not make the same sound. They are pretty silent. Does anyone know why? I have also used a board and motor from a 5500 and put it in a 4000 and it makes the same sound as if it where the original motor.