In this video I show you how to take apart the dishwasher so you can remove any foreign object from the food chopper area.
Often times a dishwasher will run noisy during the wash cycle if things like toothpicks, seed, small pieces of glass or bone get down into the food chopper. If the food chopper screen gets really plugged up with stuff then the dishwasher will not clean very good. A plugged up chopper screen will cut down on the water pressure to the spray arms. You will often notice this as the top rack does not clean very good anymore.
As you can see from the video it is very easy to check.http://www.youtube.com/watch?v=jMH8I-eJeQ4
If you checked your noisy dishwasher and could not find any foreign object in food chopper area then you may need to replace the main motor.
Also the chopper may have been damaged. If the screen is really plugged up with food becuase the chopper is damaged you will not get much water pressure to the top spray arm. It is best to replace the chopper assembly at this point.