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Thread: Toto Drake Gmax Fill Valve Issues - stutters as toilet tank finishes filling

  1. #31
    DIY Senior Member suceress's Avatar
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    Quote Originally Posted by Terry View Post
    I'm glad you got this one knocked out. Jamie has walked women through the process of checking the assembly cap on the 528 over the phone, without tools. It should take less then a minute.
    Of course, with Seattle water, things come apart easier then in other parts of the country. Most of our water is from snow melt.
    Thanks! The water from my well is very full of sediment. I wish I had taken advantage of the opportunity to clean the holding tank when it was empty but I couldn't get the lid off without disconnecting some electronic components and I did not want to mess with wiring (plus the original pump house collapsed and we built the new one around the well and there isn't much wiggle room). I wish I could find a lid that had a hinge to open up just part of the lid so I could look inside or get inside if need be. One thing I'm sure of is that my water is high in iron. We have several Brita filters to filter the drinking water and we fill some large bottles we got from the dollar store.

    Quote Originally Posted by wjcandee View Post
    This is how you start to get the bug. Happened to me. Congratulations on this project and we look forward to doing more with you in the future!
    Thanks! My next project will likely be replacing the cartridges in my Aquasource faucet. I got it 11 years ago but the sediment is rough on plumbing parts here and the cold water lever cartridge deteriorated (for the bathroom sink). I couldn't find a phone number or website so I went to Lowes and looked at the box of a newer faucet to find the contact info. The clerk at Lowes told me that it was a lifetime warranty so we should get the part for free. We called and they are sending two cartridges (just in case) out on Monday.

    My mother (I'm sort of her caretaker) also picked up a new tub spout, handles, and shower head for her bathroom. The diverter in the current tub spout is absolutely shot and the handles don't work efficiently. The entire assembly inside the wall is not secured properly, when I was trying to make the water stop dripping by turning the knob the entire assembly pulled forward. She decided to go with a cheap AquaSource thing that was about $49 so I don't know how good it will be, but its her money and its what she wanted. I just do the gruntwork. LOL. I suppose I should head over to the tub and shower section and read some posts.

    If all goes as planned, I will hopefully have things fixed by the time my sister comes out to visit.

  2. #32
    DIY Junior Member muddlerminnow's Avatar
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    Default Toto Ultramax CST 854, slow filling with long "burping" sound at finish

    Our unit was installed in 08, it has all original parts, and has worked fine. However, during the last few days we've noticed it is slow in filling and makes a longish "burping" sound, and then a kind of hiss just as it shuts off. Obviously, these are highly subjective terms, but it's the best I can do.

    I've gone through most of the posts, and can't find anything that seems to fit. The tank fills to about an inch below the top of the flush valve. The valve itself feels properly seated, though I haven't checked for cracks. There is no sound of leaking water, however. I've pressed down on the flapper to try to make sure there's a good seal while the fill is going on. There's slack in the chain above the "float," but it is taut below.

    As for the sound, I saw that you used the term "water hammer" to describe another member's problem. Regarding pressure on the water heater, etc., we did drain the water heater and shut off the water supply to the house for three months during the winter.. Activated everything six weeks ago.

  3. #33
    DIY Senior Member wjcandee's Avatar
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    Quote Originally Posted by muddlerminnow View Post
    Our unit was installed in 08, it has all original parts, and has worked fine. However, during the last few days we've noticed it is slow in filling and makes a longish "burping" sound, and then a kind of hiss just as it shuts off. Obviously, these are highly subjective terms, but it's the best I can do.

    I've gone through most of the posts, and can't find anything that seems to fit. The tank fills to about an inch below the top of the flush valve. The valve itself feels properly seated, though I haven't checked for cracks. There is no sound of leaking water, however. I've pressed down on the flapper to try to make sure there's a good seal while the fill is going on. There's slack in the chain above the "float," but it is taut below.

    As for the sound, I saw that you used the term "water hammer" to describe another member's problem. Regarding pressure on the water heater, etc., we did drain the water heater and shut off the water supply to the house for three months during the winter.. Activated everything six weeks ago.
    Most likely the problem is with the fill valve in the toilet. You might turn the water all the way off and all the way on there at the wall by the toilet just to make sure that there isn't anything sticking that is causing this (i.e. gunk). Then, it's most likely gunk in the fill valve that is causing your issue, based on the fact that you had drained and refilled your water system.

    Easy to fix. Here are the service instructions for the fill valve. It's easier than it looks to service it. On the service instructions in the link below, there are pictures of the Type A and Type B valve, so you can figure out which one came in your toilet. The Type A valve is made by Voreto in China to a Toto design. The Type B valve is made by Korky in the US. They are used by Toto interchangeably. If you need a new fill valve, you can just pick up the Korky 528MP Maxperformance fill valve at any Lowe's and many local hardware stores. (HD doesn't carry it, which is odd, since it's the #1-selling Korky product at Lowe's.) It's the one with the silver cap. Don't get the white-cap one because your toilet requires more refill water than the white one will provide. You just run the 528MP with the little refill adjuster wide open in the old Ultramax and you're perfect. (You'll see what I mean if you get to that point.) Your toilet could also take the Korky 528T "Fits Toto" fill valve, which now seems mostly to be sold at local hardware stores.

    Further, if you have a Type B valve, here is the video from Korky on how to service it. The Toto piece is a little more comprehensive, but the video is helpful in seeing how it's done:



    If servicing the valve doesn't fix the problem, and you have the Korky Type B valve, you can just replace that little cap with a new one from Home Depot for like $4. It's Korky Part No. R528. If there are big indentations in the rubber when you take the cap off to rinse it and it's not smooth like in the video, it's probably time to replace it. NOTE: Amazingly, and reprehensibly, Lowe's seems to have stopped carrying the R528 Cap, but HD still has it, as do many local hardware stores and plumbing supply places, But really, now, Lowe's. That sucks.

    This is a fun, easy project that you really can't do wrong.

    If you do end up replacing the fill valve, here's a video by Korky on how to do it: http://www.youtube.com/watch?feature...&v=Gw7HvHtaA84

    Come back with any questions, and let us know how this turns out for you!
    Last edited by Terry; 02-16-2014 at 05:52 PM.

  4. #34
    Retired Defense Industry Engineer jadnashua's Avatar
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    Any time you shut off the water, drain the lines and refill, the inrush of water can dislodge crud that accumulates on the inside of the piping...then, weird things can happen - strainers get clogged, shower heads get plugged, valve seals no longer work perfectly, check valves get stuck. You may just be able to remove, clean, and replace the cap on the fill valve and resolve the problem. But, it is nearly 5-years old and a new cap is less than $3 at Lowes (assuming you have the valve made for Toto by Korky).
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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