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I bought it about 45 minutes ago!

I have been along time lurker of this great site and finally broke down and got me an old dishwasher and joined up! I always love looking around and when I saw the link to this machine I decided to jump in! I hope I have not screwed up buying this particular dishwasher because no where does it say "Hobart". I hope this is not a Whirlpool built unit, but it sure looks like a Hobart made machine. If anyone could validate if it is indeed Hobart that would be awesome. The model number is KUDS21MS1 and the serial number is 83062059.

I am planning on testing it out Friday and will take some photos if anyone is interested.

Thank you all so much!!
Mitch
 
Whirlpool!

Here is the easy way of knowing who built the machine!
KitchenAid by Hobart used the simpler model designations like KDS and KDM.
The data plate would also have said Kitchenaid Division of Hobart Corporation, Troy, Ohio.

Your machine is a Hobart design built by Whirlpool(probably by ISE but that's another story) And it uses the Whirlpool designation of K"UD" signifying Kitchenaid Undercounter Dishwasher. Your data plate should read, Kitchenaid, St. Joseph, MO.
They still use the same system today.

It is nearly identical to the Hobart design and Whirlpool kept the same tank design thru the 23 series but with changes in some smaller details of the tanks in the 23's. The major difference came on the 23 series with the change to the Whirlpool Power Module pump system. The hole in the tank sump is smaller on the 23's so you can't swap out the pumps but many of the other mechanical parts will swap out.

My Monterrey is a Hobart built machine and is especially quiet compared to any other Hobart machine I ever had because the whole tank, top sides, back and bottom is covered with a layer of bituminous rubber as well as an addtional layer of foil covered fiberglass. The rubber coating really tanks the "ring" out of the steel as the water hits the inner walls. I have a Whirlpool built Superba 22 that only has the rubber halfway up the sides and back and across the top and it is noticeably noisier. I would like to know what they did on your unit.

You will love the Monterrey,so start collecting spare parts like racks and pump parts while there are still many of them around as most parts are no longer available and you can get lots of help from everyone on here too.
 
Welcome Mitch!

You did fine.  As Steve said above, it's still a Hobart design.  Your machine probably works fine too.  My guess is that it was replaced as part of a total kitchen remodel, not because it had any operational issues.

 

Looking forward to pictures!

 

Ralph
 
Thank you so much! As you said, it does have all of the foil wrap insulation as well as the rubber membrane as I just checked. The bonus with this dishwasher is the house had two of these side by side. One unit had a rust hole in the tub so the owner had it scrapped. They elected to replace both units with new ones to keep everything matched. The bonus part was the owner removed all the baskets and racks from the unit that was scrapped and included them in the sale. The sad thing was the unit that was scrapped was still working and not leaking.

Again thank you for the information. Oh, and on second look the rubber starts about a 1/4 of the way up the sides from the bottom. I promise I will post pics :). I am off Friday and plan on playing with it then-- she will get my full attention!
 
Pretty much plug & play

I spent most of the day Friday playing with the dishwasher--I got power to it as well as hot water--blessed with a washer dryer hook-up off the carport that we do not use...yet :). I did soak the tub with a bucket full of hot tap water first to make sure there were no leaks and to let the seals get wet. I ran her through a normal cycle and had no issues! I continued to mess with it the remainder of the weekend and I did have one leak appear. It had a very slight drip from the left front corner, beneath the door. Not much though--I cleaned the gasket and that seems to have stopped it for now.

She is a sweetie! All cycles seem to function like they should--I love the heated air dryer! Very quiet--of course I love hearing the big old pump run with the lower access panel off :). I have found no rust on this machine!

mitch++7-29-2012-18-32-3.jpg
 
Beauty!

Nice find! Ok, so what year is it, approximately? I know KA was "absorbed" by Whirl-tag-more-pool in or around '86, so is this model one of the transition models?
 
Thank you!

I "think" it is an 83 model and ths is totally an assumption as the first two digits of the serial number start with "83"--I may be totally off base though! The full serial number is 83062D59. From what Steve said though this is not quite a Hobart though :(

I literally just washed a good challenge load from dinner and it did great! Dinner plates, flat wear, two muffin pans with baked on crud as well as mixing bowls that had muffin mix sort of solidified as well as stemware and glasses. It did as well as the current Kenmore Elite purchased in 1992ish. I used the Cascade Complete gel pack---I also topped off the rinse aid dispenser.

I have wanted an older Kitchen Aid for a long time!

mitch++7-29-2012-19-20-10.jpg
 
Age of unit???

Take a look on the front crossmember on the frame and see if there is a small stick on label with a date code on it.. e.g. 163083 or something like that. They used to put a date code on there to show the exact date of production.

If it is there, the first numbers denote the numerical day of the year and the final numbers indicated the year or vice versa.
 
Found the sticker!

It was to the left of the solenoid mounting screws. Unfortuantely it has faded out--I can make out the first two digits--27--but nothing else. Darn!! Thanks for pointing this out though! Great info!!

Mitch
 
I have that exact machine and I love it....

The link below is a video of it washing after I replaced the Wash Arm Support (thanks SteveT).   Mine was badly worn, cracked and the filter was essentially gone.   It wasn't moving much water before but look at it now!!

 

This is one really nice machine and I have run a few dirty Bob Loads through with stunning results.  Not a bit of YIBBLES on the glasses up top.  I'll post the Bob Load pics separately.

 

Very nice machine and that one looks like a great find!!  I love it when we save these older machines.

 
Here is one pic..

On one of the loads I purposely let some coffee grinds get in there, I had some oatmeal bowls with a bit of stuff left on and all kinds of other stuff.  I was eager to see what would be left on the top of the dishes.  Before the filter was replaced there was a lot of stuff left up there.  Now that I have the new filter (part of Wash Arm Support) you can see it doing its job.  There is an indent in that part of my coffeemaker so I set in such that it would collect the water and as you can see that water is perfectly clear.

chachp++7-30-2012-05-38-55.jpg
 
Wow!

That is so cool--enjoyed your video! You also answered a question in my mind--where the silverware basket is suppose to ride! When I got the machine, it was on the right side of the lower basket and every dishwasher I have had since had it on the right side. I noticed in the Superba that with it being on the right side of the basket, it seemed to block some of the tines for loading. I felt like this was not correct. It does ride better in the front of the rack like in your video!

BTW, the only thing I have found that this machine needs is a one replacement clip for the upper wash arm guard--and they are listed on repair clinic as being available for .79 cents :)

Thank you so much!!
 
Not an 83

I was on the Kitchen Aid site and lo & behold was able to download the documentation on her. It was copyrighted 1988, so it is newer than I was guessing. Not sure if that is good or bad.

You all are so awesome and helpful!!

Thanks
 
The dating game!

I don't want to rain on your parade, but the copyright date means nothing as far as when your machine was actually built. The manuals were originally copyrighted by Hobart prior to the sale of KA to Whirlpool,so it would stand to reason that once WP had all the documentation, they revised and copyrighted the materials as belonging to them. They made the 21's for a long time and they were still being made in and around '86 or so..I forget the exact dates but I am sure someone here will post them so you can be reasonably sure of its approximate age. Of course, you can just call or email whirlpool with the serial number and they can tell you exactly when it was built.
 
Same old grind, Raplh!

Ralph, it is funny you mentioned the coffee grinds test! Many years ago we had a KDS15 and then a KDSS16 in my M om's house and we always had the yibbles to deal with. Less so in the 16 with the Constant Rinse but definitely in the 15.
I was able to get a Custom 21 from the local Kitchenaid distributor that was a warranty exchange and installed that in the place of the 16.
I was immediately impressed with the disposer and filtering system in the 21's and decided to run a test on it myself using the coffee grinds too.

Only my test involved nearly 8 scoops of used grinds that were still in their basket and I put it in the front of the top rack in the center row and filled the rest of the dishwasher with the dishes that were ready to go in after breakfast and only did a rinse and hold cycle to see how well the machine would deal with the mess I was feeding it.

Much to my surprise, with only the rinse and hold being run, I removed the basket when the cycle was done and there was not a single grind in it and there weren't any appreciable signs of them in the machine itself anywhere! Even the tops of the cups were clean on the top rack.I removed the wash arm and you could still see a few grinds on the underside of the fine mesh filter in the soil chamber but they were all gone with the next full cycle.
I would say that it was a good testament to the design of that washing system.

I guess I should try it with my current daily driver and see what happens with the tall tub pump and food disposer it has in it. In fact I will and will take the pictures to post here too.
 
Good advice Steve

I eamiled Kitchen Aid support with the model & serial number asking the manufacture date. Fingers crossed they will reply back with something.

You guys have me way curious about some more "challenge" loads :) Coffee grinds, eh? I can certainly provide those!

Thanks!!
 

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