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What would be causing a loud rumbling type noise in my Maytag dishwasher?

I have a 4 yr old dishwasher model MDBH950AWW that makes a loud rumbling noise only during the wash cycle but works/clean OK. For 3 days now my dishwasher makes a loud noise like it is low on water but the water level is OK. The wash cycle starts OK but in 5-10 sec the noise starts, but not constantly. Yesterday it did not start making the noise until 1/2 though 1st cycle. I checked the water level and moving parts inside, seems OK. Seems like I have a water restriction somewhere but then I would have the noise all of the time. Do I have a bad motor?

Dishwashers , Maytag , Building Supplies
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1 Answer from this member:
Joey S
The noise could be caused by various objects or a failure in the motor shaft or wash impeller shaft. The motor shaft and the wash impeller shaft should be examined for any failures. Most likely you will find a broken wash impeller drive shaft or stripped motor shaft.

Hard Object Noise:

If the noise is a popping, rattling, grinding, or a low pitch screeching sound, then the pump should be disassembled and the object removed. The hard object is typically located in the sump area of the tub or sitting on the motor mounting plate. For a low pitch screeching sound, the object is typically found lodged in the holes of the chopper plate or stuck to the end of the chopper blade.

The size of the hard object could range from a small piece of pecan shell to larger objects like screws, bread ties, broken pieces of plastic, or Saranâ„¢ wrap.

High Pitch Squeal:

If the noise sounds like feedback from a speaker or a high pitch squeal, disassemble the pump and look for objects lodged in the chopper plate. Objects lodged in the chopper plate, or thin plastic Saranâ„¢ wrap pieces stuck to the chopper blade can emit a squeal. Replace the wash motor if there are NO objects found in the pump, and the source of the high pitch squeal has been determined to be in the wash motor itself.

I recommend calling a service technician to diagnose and repair your dishwasher.
by Joey S Earned 21,462 community points in Dishwashers
January 19th, 2009
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