View single post by mnementh
 Posted: Sat Jun 30th, 2007 07:59 pm
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mnementh



Joined: Sat Jun 30th, 2007
Location: San Antonio, Texas USA
Posts: 10
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Okay... I'm a noob here, but I do kindof have a lot of experience in a number of disciplines, including appliance repair. ( I spent 3 years working for a local Ding & Dent store, rebuilding new damaged appliances for discount retail. Mostly gas ranges & dryers, some laundry, very little dishwasher)

I have a KA dishwasher which uses the PowerClean module; when I first took it in about 4 months ago it had just started leaking around the mainseal, so I did that service per the PowerClean Module Service Manual found on servicematters.com.

When I put it back together, I realized that I wasn't sure how the two drain check balls go, & the manual is very specifically useless on that point - no reference AT ALL except the diagram below, which shows BOTH check balls under the drain cover. As there is not enough room under the drain cover for both of them (the drain cover will only seat if ONE is placed in the center of the well shown in photo A) I looked closer, & determined that the mating surface on the bottom of the Separator/Filter assembly (Photo B) has a chamfered edge, indicating that it is in fact a seat for a check ball. Based on that, I assembled the unit with the drain check balls as shown in photo C, with one ball below the drain cover in the well in the lower pump housing, & one above the nipple in the drain cover opening so that it is free to seat against the chamfered hole in the bottom of the separator/filter assembly.

The dishwasher seemed to work okay this way, not great, sometimes upper rack not getting as clean as I'd like, but I just attributed it to careless stacking. Last week, it stopped cleaning in the upper rack at all, & lower rack washing became very poor. I took the unit apart this weekend, & found that the Separator/Filter Assy had split in half at the seam; probably from pressure buildup inside, as the screens were almost completely clogged with soil & scale. 
At this point I have to ask myself "Did I put those checkballs in wrong, & could that have caused this failure?" I've got a new Separator/Filter from my local partshouse, but I really don't want to risk exploding it if I've assembled the pump incorrectly.

I guess my problem is this - I'm having a hard time visualizing the water flow through the Separator/Filter, & as such I can't see logically how the check valves work.

So, if any of you out there actually know, could you please tell me if the check balls go as shown in photo C, or if they go as shown in photo D? If they DO go as shown in photo D, then WHY are there 2 of them in that cavity? What purpose is served by that arrangement?

Do the check balls go in a different arrangement I haven't addressed here? If so, How?

I've read in posts across a number of forums by a number of technicians that this design is one of the best that Whirlpool ever came up with, & that if I'm having trouble with dishes not getting clean, there is definitely something WRONG - these dishwashers simply wash very well.

So, I'm asking for help from the forum - What do you know?

Thank you very much,

Mnem - Manic Mechanic & Dragon about Town.

Attachment: Balls.JPG (Downloaded 213 times)



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