Maytag Neptune model # mah6500aww: makes banging noise and causes machine to move

A loud banging sound in the pipes is usually caused by a water hammer effect. Water hammer sounds are caused by a valve closing in the system, and yet the water in the pipe is still flowing because of its kinetic energy. The banging happens as the water hits the valve that prevents it from going any further. If the kinetic energy is great enough, it can actually cause a pipe to burst or explode at the end. If a valve is closed near the beginning or in the middle of a system, the water keeps flowing after that point, and it can actually create a vacuum. This vacuum can cause a pipe to implode if the stress is too great. Roaring type noises may be coming from a spin bearing. This bearing probably had the grease washed from it because of a tub seal leak.
Squeaking sounds in a new washer are usually caused by the new parts getting broken in, and will usually go away after several washes.
The sounds of water gurgling, slurping, or sloshing during a spin cycle are usually caused by the drain pump pushing the water out of the washer tub.
Too much water pressure can cause a whistling or squealing sound. Adjust the hot and cold intake water valves to relieve this sound.
Metallic clinking sounds during spin or agitation may be the result of drive train components meshing during speed changes or after a pause.
Swishing or swooshing type of sounds may be caused by water and suds trapped between the tub and basket during a spin cycle, and will usually clear up as the water is drained from the washer