Question about Maytag 24 in. MDB9750AW Dishwasher

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Loud noise maytag dishwasher quiet series 100

The dishwasher is about 4yrs old, and I use it about once a week. Suddenly tonight it started making a loud grinding noise after filling. It sounded like it came from the bottom. I thought it was something sticking out and scraping on the moving parts. I drained it and removed everything, filled again and the noise was still there. I am afraid of a pump failure.. i don't want to flood my hard floors!! I am not sure if my washer has an internal garbage disposal or not. I would need some detailed information and pictures on how to disassemble parts since I have never done this before. thank you very much. dalila

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  • Douggg Jan 06, 2009

    Just today January 6, 2009, our Maytag quiet series 100 started making the same noises. It sounded like vibration or buzz, nearer to the front and at the bottom of the machine.. The dishwasher was present in our house when we bought, so I am not really sure of how old it is. I am going to estimate that the diswasher is about 4 years old as well.

    Doug L.


  • av8trdan Jan 06, 2009

    Same thing washer is about 4 yrs old and this began last 2 washes and seems to come and go. The noise/grinding gets loud and then quiets.

  • Anonymous Jan 10, 2009

    I have had the same problem with the Whirlpool quiet series after only three years. We couldn't afford to buy a new one and I've been taking my chances running it daily and no flooding and dishes come out clean.

  • bkoto Jan 25, 2009

    I've had the same problem with my Quiet 100. It used to make a grinding noise every once in a while and now it's during every wash. I tried solution #1 to no avail, anyone else try anything different and had it work. Thanks.

  • Anonymous Feb 12, 2009

    my maytag quiet series 100 is runs LOUD, dishes have to cleaned before loading them AND it runs for about TWO hours plus! it was in the house when we bought it, but I'm VERY dissapointed

  • fred_bert949 Feb 21, 2009

    Me too! This Maytag is a **** dishwasher ... No clue about the problem. HELP!

  • Anonymous Mar 20, 2009

    I have the same problem. Where can I find the service manual so I can disassemble the drain?

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Hi All,


I have had a Maytag Quite Series 300 for some years now and have done basttle with it on may occasions. I now consider myself somewhat of a veteran, although by no means a repair expert!


Grinding Noise: From either a clogged/blocked impeller or not enough water getting to the impeller.
For a clogged impeller, it is fairly easy to disassemble the washer to get at the impeller to remove any debris or blockages.
For not enough water it can be a number of things. First of all, you will notice that the noise lessens if you add a jug or two of extra water. This is because if the water level is too low, the pump impeller will get some air mixed with the water & this is LOUD! Now for the causes:
Float – If the float gets stuck in the wrong position (debris or water deposits), it will not fill enough.
Float Set Wrong – Seems thats some of these dishwashers have the float set a little too low to let the dishwasher perform without grinding. A few pennies attached to the float with a rubber band seems to help here. Don't go too far or you'll flood your kitchen!
Timer – Some folks have mentioned that dishwashers that fill on a timer will not fill enough in the allotted time, if the water pressure is low. While this is true, I have looked over the electrical & parts diagrams for the QS300 and I do not see a timer listed anywhere. Also, the wiring diagram appears to show that this dishwasher only uses the float to achieve the correct water volume. I could be mistaken here.
Note that in VERY hard water areas (like mine – TDS of 850 hardness or 49 Grains), the plastic fins on the cover of the impeller get very choked up with water salts and this can impede flow, leading to a low-water symptom, when in fact, there is plenty of water.


Dishes Not Cleaning:
Poor Water Flow – See above, all the above items will negatively impact dish cleaning.
Poor Q uality Detergent – After trying them all – Yes, all – Do not use cheap detergent. Buy the brand names: Cascade or Electrasol work well. I have found that by far, the little packs work the best. We found that the liquid works second best and the dry stuff really isn't up to the task at all, no matter which brand.
Spray Wands Catching – We found that our lower spray wand was catching on the bottom of lower dish tray, so I very slightly bent down the legs that the wheels mount to in order to lift the dish tray/basket a little and give the wand a little more room. This worked well.
Spray Wand Nut Too Tight – The factory seems to send the dishwasher out with the nut on the bottom spray wand tightened a little too far. Loosening this a little bit lets the bottom wand rotate much more easily.
Top Spray Wand Not Meeting Receptacle – The top spray wand is attached to a pipe that mates with a port (well, one of two ports, depending on if you have the top rack in the “Upper or “Lower” position). The pipe seems to have a tendency of missing the port. A well placed elastic band will help here. Note that on our dishwasher, by the time the first elastic band wore out, the pipe had been permanently moved to the correct position by the gentle pressure.
Tines/Dish Holders On Top Rack Falling Over – The tines (metal spikes) that hold dishes on the top rack fold down by design. Issue here is that they do it sometimes during the wash, causing the dishes to fall over and block the spray. A few well placed rubber bands help here as well.
Water Salt Buildup – If you live in a very hard water area, you can still get clean dishes from yor dishwasher. We do and we have VERY hard water. Buy a gallon of vinegar once a month. Pour this into a clean dishwasher. Turn it on so that it runs for 2 minutes to circulate the vinegar. Open the door & let stand over night. Close door & finish cycle. This will cut down significantly on the hard water salt buildup in the washer.
It's A Maytag – Sorry folks, it's true. I have learned (after purchasing the dishwasher) that Maytag has run into financial difficulty in recent years and has reduced build quality to save money. If you got suckered into buying one of these, you will very likely never buy one again. My opinion is “Do not by Maytag.”


Hope this helps someone!


Posted on Feb 10, 2009

  • bmx2 Mar 07, 2011

    The QS300 does not have a timer, but it is part of its program. The program give approx. 90 seconds for the water to get in, and then it will start its washing or rinsing cycle. If you don`t have enough water pressure you just won't get enough water to keep the pump full, and you will have cavitation. (If you have too much pressure the floater will prevent to overfill.)
    Th problem seems to be that there isn't have enough water getting in, you will not have a sensor to prevent the pump to run empty, and that could damage the pump and/or the motor, and meanwhile your dishes will not get clean. A really bad design of the software, deeply flawed. For this machine you MUST always have enough pressure to fill is up before the time ends. Wish somebody could find a way to re-program it...

  • Barbara Gower Sep 05, 2012

    Thank you; you definitely helped me. You saved my dishwasher! My second one, actually. My hard water "ate" the first one. Second one is the horrible Maytag "Quiet Series" (ha-ha) 100. Same grinding noise as reported above, and the dishes were not getting clean. I had to stop using it. I tried the vinegar trick and it is as good as new! No grinding noise and the dishes are clean!

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I have a Maytag "Quiet" Series 100 having the symptoms of getting loud than soft than loud... like a vibration or grinding sound which occasionally goes away. After opening up the washer and finding no glass or plastic remnants I began to suspect that the noise is coming from lack of water flowing up into the to the impeller pump - that is - if the impeller pump doesn't get a good steady flow of input water, you get cavitations (water with voids or bubbles in it) which causes all kinds of nasty noise. In my machine, there is a food grinding blade at the bottom, then above it, a metal grinder plate with holes in it and above that the impeller. I found the grinder blade to be perfectly flat. When I removed this blade and tested the machine, it went totally quiet. So, the fix was simple. I gave the grinder blade a slight twist (shaping it like a propeller so as to push water upward towards the impeller pump). When I mean slight, the twist is barely noticeable. You need to know which way the motor rotates - you can figure that out by looking at the impeller pump fins. Anyways, I popped everything back together and the machine sounds totally normal now.

Posted on Jan 21, 2009

  • redmickity Feb 23, 2009

    I have a Maytag Quiet Series 100 and a month ago posted an fix related to noise produced by this model - my fix was to tweak the food grinder blade. Well, while that helped at the time, I found the the underlying problem was more related to the water fill level. If the water pressure to the unit is low for whatever reason, it has a safety mechanism that forces the unit to time out and stop filling even if with the float "not floating". I tracked the plumping back from the unit to a crappy valve that was restricting the full flow to the unit - once fixed, the QS100 filled on time and did make the vibration noise any longer.

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I had the same problem my dishes got clean but it was very loud. I took the inside apart and found that there was a plastic bread clip down where my grinder is I removed it and so far so good.

Posted on Aug 05, 2010

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Added water as per Fingaluna's post...Instant quiet! I will be checking the float tomorrow. I can't believe I've been putting up with that awful grinding noise for so long! When this dies, no more Maytags for me...

Posted on Oct 01, 2010

  • tashamom Oct 07, 2010

    Ok, problem still exists. Adding pennies to the float didn't help. I've taken this machine apart 3 times now, and the grinding continues. :(

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My Maytag Quiet Series 400 just started being loud when cleaning. I followed the steps here and found a plastic forign object under the impeller area. It was probably the culprit, because it is working now.

Posted on Aug 20, 2009

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Follow the advise of Fingaluna below. He has it right. I tried his advise and it worked. No more noise. Clean dishes. A gallon of vinegar is a lot cheaper than a new dishwasher. My hard water ate my first dishwasher; the Maytag is the replacement. I'm like you - only use it one every couple of weeks. I had the same noise; also dishes were not getting clean. One vinegar treatment, and all is well. I am very grateful to Fingaluna!

Posted on Sep 05, 2012

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