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Thread: toto drake eco TSU33A fill valve cycling on and off quickly

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    DIY Junior Member Maxxsounds's Avatar
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    Question toto drake eco TSU33A fill valve cycling on and off quickly

    Hi,
    45 minutes of searching and nothing yet. Toto drake eco version, about 2 years old. Tank is st743E, bowl is elongated and the handicapped version. fill valve says "e-max by toto" on top and is green.

    Upon flush, the fill valve cycles on and off about once per second until the tank is full. Never did this before. Fill valve seems to work correctly except the cycling on and off. No leaking in between flushes.

    Is this fill valve able to be disassembled and cleaned? With a fair amount of pulling, I cannot seem to get the top cover off. It seems to be one piece to me. Am I not holding my mouth right?

    Thanks in advance for your time.

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    Forum Admin, Expert Plumber Terry's Avatar
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    You can remove the supply line, and then pull the filter at the bottom of the fill valve.

    http://www.terrylove.com/forums/show...for-E-Max-TOTO


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    DIY Junior Member Maxxsounds's Avatar
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    Default toto e-max fill valve issues cycling on and off quickly

    Thank you for the quick reply. The fill valve on my drake looks different than the one you have shown there. Attached is a photo of mine.

    I am trying to determine if the symptoms warrant pulling the valve out.

    The volume of water coming through is as strong as before, it just cycles on and off quickly. If the filter on this valve was clogged, wouldn't there be a reduced volume of water coming out?

    If I partially close the valve on the wall behind the toilet while it is filling, the cycling stops and I get a steady (less volume) stream of water. Thanks again, you guys rock!Name:  toto drake #2.jpg
Views: 513
Size:  39.6 KB
    Attached Images Attached Images  

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    Forum Admin, Expert Plumber Terry's Avatar
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    www.terrylove.com/korky

    What you have is the Korky fill valve.
    A replacement for that would be the Korky MaxPerformance.

    Or, you can remove the black fill tube, and pop the green cap off.
    Under that you have a float and a cap. Remove the float, spin off the cap, counter clockwise. You may be able to clean that or replace the cap.



    Assuming that you are overflowing the tank into the overflow tube.
    If it's just refilling because of a leaking flapper, deal with that first.
    Last edited by Terry; 01-09-2013 at 05:15 PM.

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    DIY Junior Member Maxxsounds's Avatar
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    Nothing is overflowing. The flapper is not leaking. Just a rapid on-off of the valve when it is filling the tank. Instead of turning on once and turning off once, it is doing that 50 times in one fill of the tank. Once every second. It stops when the tank is full. Would a defective cap cause that? Thanks guys, learning as I go...........

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    Retired Defense Industry Engineer jadnashua's Avatar
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    The repair cap costs about $3 and is available at Lowes, any plumbing supply house, and some hardware stores. Once you figure it out (The instructions are on the package), it takes less than a minute to replace or check. I'd pick one up (you'll need one eventually, anyways), remove the current one, check for debris, put it back in, see if it works, and if it doesn't replace it with the new one.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  7. #7

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    Quote Originally Posted by Maxxsounds View Post
    Thank you for the quick reply. The fill valve on my drake looks different than the one you have shown there. Attached is a photo of mine.

    I am trying to determine if the symptoms warrant pulling the valve out.

    The volume of water coming through is as strong as before, it just cycles on and off quickly. If the filter on this valve was clogged, wouldn't there be a reduced volume of water coming out?

    If I partially close the valve on the wall behind the toilet while it is filling, the cycling stops and I get a steady (less volume) stream of water. Thanks again, you guys rock!Name:  toto drake #2.jpg
Views: 513
Size:  39.6 KB
    Where does your water come from? That tank is filthy for just 2 years. That would be what a tank that was in service for 40 years around here would look like, at worst.

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    DIY Junior Member Maxxsounds's Avatar
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    Quote Originally Posted by gusherb94 View Post
    Where does your water come from? That tank is filthy for just 2 years. That would be what a tank that was in service for 40 years around here would look like, at worst.
    Ha, Boise,ID there sir. ALL city water is that way. That brown is iron deposits. When you pull the screens off the lav faucet, you come up with about a half a teaspoon of little white pellets, kinda looks like kosher salt. Don't know what that is.

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    Test, Don't Guess! cacher_chick's Avatar
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    That is what a tank looks like when you have iron in your water.

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