Thread Number: 72263  /  Tag: Vintage Dishwashers
KDS-21 Parts and advice needed
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Post# 955323   8/30/2017 at 15:43 by jkbff (Gladstone, ND)        

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I have a customer that needs some parts. They need a wash arm mount/filter screen (just the screen really).

The dishwasher is taking in water but the metal filter is so built up with years and years of debris that the pump isn't pumping water. He came in with the complaint that the dishwasher isn't spraying the soap out of the detergent cups.

I dumped a gallon of vinegar and some hot water in the unit to let it sit over night just to see if any change happened. It grumbled and groaned but it took more water out than last time.

I took the wash arm off to see if the support was solid and discovered the torn mesh filter.

I am thinking I would probably dump some CLR in it and let that sit. Everything is so built up that I can't get the filters off to scrub them.

Also, if I can get it going for him, I am going to have the service department replace the drain hose and the water line.

The customer said that he didn't realize the dishwasher needed to be cleaned out from time to time and it has been in constant use since when the house was built many years ago.

Anyways, if anyone could help him out, I would appreciate it. The kitchen is laid out in such a way that the dishwasher door just barely clears the fridge when it is opened. I know the door on a tall tub would hit the fridge.

Also, this is different than my KDS18/58's that I have, how do you take the metal filter off? Just pull straight up with the bakelite on top or? I am so afraid of breaking something because of the build-up.

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Post# 955359 , Reply# 1   8/30/2017 at 21:27 by combo52 (Beltsville,Md)        
Cleaning A KD -21 DW Filter

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Hi there is only one filter that needs occasional cleaning on this DW, after you lift the WA off you just grab the top edge of it and pull upward to remove it.


Replacing the fill and drain lines will do nothing to help this DW work better, it probably could use a new inlet valve and a new drain check valve, and in the future it would help if the user used better detergent, maybe softer water, and differently stopped rinsing the dishes before loading.


John L.

Post# 955382 , Reply# 2   8/31/2017 at 02:44 by jkbff (Gladstone, ND)        

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Is it safe to run with that top filter in the condition it is in?

The water line is an old copper line that has a slight kink in it. I have noticed around here copper lines tend to have a lot of buildup the older they are.

I will go back over probably tomorrow and pull the stainless filter out and clean it for him.

Thank you for the reply.
I'll take some boil out with me.

Post# 955433 , Reply# 3   8/31/2017 at 10:23 by combo52 (Beltsville,Md)        
You can run the DW with the torn fine mesh filter

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I would not worry about the copper water line, if this lightly used line is clogged with minerals the entire house would need re-piping. If you have any dough about the flow rate of this water line disconnect the inlet valve under the DW and briefly turn on the water [ be prepared for flood ]

Post# 956818 , Reply# 4   9/9/2017 at 18:58 by jkbff (Gladstone, ND)        

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I had the techs bring the dishwasher in this week and had some free time today to clean it.

Here is my current issue... I dont think this is right. It almost seems like it is loosing power after the startup winding kicks out.

Post# 956823 , Reply# 5   9/9/2017 at 19:28 by DADoES (TX, U.S. of A.)        

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Doesn't seen enough spray pressure.  Lower arm should be stronger at the ends, through the silverware basket.  Upper also not getting enough pressure to rotate and/or is dragging.

Post# 956825 , Reply# 6   9/9/2017 at 19:53 by jkbff (Gladstone, ND)        

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But look at how the pressure is at first. It's like the motor slows down.

Post# 956887 , Reply# 7   9/10/2017 at 07:59 by combo52 (Beltsville,Md)        
Motor Is Not Slowing Down

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The DW may not have enough water in it [ try the same test with an additional gallon of water added ] If this works REPLACE the inlet valve or if can find them replace the rubber diaphragm in the valve.


You may have a bad drain line check valve [ check for a sucking at the end of the drain hose while DW is washing, if you hear or detect one the rubber in the CV is bad ] replace rubber with GE part.


John L.

Post# 956921 , Reply# 8   9/10/2017 at 11:07 by stevet (palm coast florida)        
Worn parts!

If you are getting a full charge of water or adding the extra water as John L. Suggests, then I would say that the wash impeller has either worn down or has maybe a broken vane on it causing the lack of pressure. You would need to remove the top half of the pump which is the wash arm support which used to have the screen on it to see the wash impeller, Also, on these machines, the wash impeller was driven by the drain impeller which was opposite to the desgn from the 15 thru 20 series. The 21 and 22 had the drain impeller "keyed" to the motor shaft because it served as the grinder for the food disposer. The wash impeller locked into a slot on the drain impeller thus driving it. The tabs of the slot on either of them could have broken, but more often, the wash impeller was the culprit. Check it out and see what you find.

I was going to also suggest that you check to make sure that the brass ring and which nylon bushing are still intact on the wash arm support. After many years of use and crappy detergent, the plactic would wear out and you would lose water pressure out of the bottom of the arm and never see it. That would affect the top and bottom arm pressure.

I have both of the parts you would need if you want to replace the fine mesh filter as well as the stainless steel filter. Just let me know.

Hope this helps.

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