Loud noise maytag quiet 300 series dishwasher making a loud grinding and screaching noise, sounds like plastic gears grinding on each other

google Maytag Quiet series 300 Handle and latch
there are several new handles about $30-35.
link to how to replace handle
copy and paste
https://www.youtube.com/watch?v=Tfw0F5XeWHY


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Pump motor gear possibly

Many Frigidaire dishwashers come with the promise of being the "quietest dishwasher in its class," according to Frigidaire. However, a quiet dishwasher doesn't necessarily mean that the dishwasher is silent, as some noises are normal. It can take some troubleshooting at times to determine if a noise coming from the dishwasher is typical or if it indicates a larger problem Listen for the sound of water filling and draining throughout the wash cycle. These sounds are normal and do not indicate an issue.

2 Pay attention to the drain motor, which operates at the beginning of each cycle. This noise should be fairly quiet and should not sound like a loud, grinding or banging sound.

3 Note that the sound will change when the wash cycle moves between the lower and middle spray arms. This sound should be temporary and fairly quiet.

4 Look for hard items in the dishwasher grinder or filter if a loud crunching, buzzing or grinding sound is heard. The dishwasher can typically grind up these items within one or two cycles, but the item may be lifted out and discarded to eliminate the sound.

5 Remove the bottom rack and spray arms from the bottom of the dishwasher if there is a loud noise coming from the dishwasher that does not resolve itself. Look inside for the impeller, which is round and spins. Remove any debris that may be clogging up the impeller or pump.

Please let me know what you did to fix this...I am having the same problem with ours. I noticed a recall on the same model just with a plastic tub. Thanks..

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http://www.appliancepartspros.com/03-pump-motor-parts-for-maytag-mdb4000awb.html

Shows the breakdown of the moving parts. There are categories for problems like noise etc.

few things move on these but the jets and the discharge pump. Are there rotating jets that are removable, if so remove them and clean them it might just be dirt. if you cant find the fault then yes! a repair man could sort it out.

MY DISHWASHER KEEPS RUNNING, IT IS A WHIRLPOOL GOLD QUIET PARTNER IV

Check for foreign objects like glass or plastic at the grinder blades. Some dis assembly will be required. See appliancepartspros.com for diagram.

look for odjects in the pump cutter ie glass plastic or the cutter is bent or a rushing sound could be motor bearings

I had the same problem with my Maytag Quiet Series 1 dishwasher until I read the comment left by the guest on June 1, 2008. I tried his suggestion about the rinse cap adjustment and WOW it WORKED. No more growling noise. Thanks you saved me a service call.