Question about Toto MS853113S#01 UltraMax Round Toilet, Cotton

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Our Toto ultramax model MS853113S will constantly

Our Toto ultramax will constantly run after flushing now. Only way to get it to stop is turn off water to toilet and then turn it back on. We've had it about 3 years and been fine until now. What maybe causing the water to continually run after flushing? We've tinkered in the tank but don't want to start removing parts and void 5 years warranty on toilet.

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Flapper most likely needs to be replaced not sealing completely is one problem----- the other is float level not shutting off water valve --and other is bad water valve not shutting off or worn and needs to be replaced remove cover and turn water on watch water level lift float up if water turns off valve good----turn off water if drain down flapper bad and needs replacement costs a couple of dollars to replace -if water stays level in tank than float needs adjustment or replacement

Posted on Aug 02, 2010


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My toto toilet flushes and refills fine, but it just started making loud noises when refilling. The noise stops when the tank is full

Your fill valve is going bad it can be replace with a new fluidmaster instead of the Ultra-G you have in it its going bad they do over time you may want to check your house water pressure in case that may have been what broke it you don';t want to break a new one.

Aug 29, 2011 | Toto MS853113S#11 UltraMax Round Toilet,...

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I think our Toto toilet has a G Max valve in it and it doesn't shut off when the tank is full. The flapper seals fine and the water just runs over the overflow tube. Where can I get a diagram of the valve...

If the G-Max valve is not shutting off, just pop a new assembly cap on it.
They are about $2.50 at Lowes.
Even a homeowner can replace the part without tools in less then a minute.

Jan 29, 2011 | Toto MS853113S#11 UltraMax Round Toilet,...

1 Answer

Have the Toto Ultramax II toilet and it was installed 3 months ago. Have an issue where the GMAX fill valve is not functioning properly. The water keeps running because it always go over the fill line....

An installation guide for your toilet can be found here:,%20ONE%20PIECE%20TOILETS,%20V.08.pdf

See the top of page 5 for guidance on setting the water level. Make sure you are turning the screw the correct direction (clock-wise) to reduce the fill level.

Is the refill tube properly connected? Should be connected to fill valve nipple and the other end clipped to direct flow to the inside of the overflow pipe.

Is water flow only through the overflow tube or is there leakage from the flush valve? Being only 3-months old you should not be having problems due to breakdown of rubber seals; however, check to make sure the toilet flapper is properly sealing against the flush valve.

If none of this helps with your problem you made need to replace the fill valve. On page 10 of your guide is a parts list; you can identify your part numbers and shop on-line for an idea of replacement costs:

Jan 19, 2011 | Toto MS853113S#11 UltraMax Round Toilet,...

1 Answer

Sands enter the tube (which is suply the water) inside my toto toilet tank. how am i suppose to clean it?

I would suggest an aquarium cleaning tool, there are vacs made to clean inside a tank below the water level. A wet dry vac may also be of assistance.
This is the a symptom of a greater issue IF its comeing from the water intake (and not a weird freak accident or toddler induced manner) To further prevent the isse i would use a filter in the tank, nylons/pantyhose will catch sediment and allow water to pass.

Nov 28, 2010 | Toto MS853113S#11 UltraMax Round Toilet,...

1 Answer

How do i reset the level on the fill valve?

Either by the chain, or bend the rod that has the float ball which is the most common and efficient way.

Jun 24, 2010 | Toto MS853113S#11 UltraMax Round Toilet,...

1 Answer

Toto seems to flush,but suction not working and waste not emtying

check the discharge hole, meaning you have to take down the toilet.
and make sure the water in the tank is at a proper high. you need the volume to create the wirlpool and push the waste.

May 20, 2009 | Toto MS853113S#11 UltraMax Round Toilet,...

1 Answer

Toto runs non-stop; won't shut off

float is sticking make sure it is moving up and down.or the float is set to low, the lower the float is higher the water level is.

Mar 24, 2009 | Toto Toilet Onepiece Ultramax ...

2 Answers

Water continues to pour into the overflow tube at end of cycle

I am also on a well and had what sounds like the same problem, so I contacted Toto tech support at  They responded within 24 hours with information which enabled me to successfully resolve the problem.  
Basically, they provided a set of diagrams and instructions which enabled me to take apart the flush valve, clean it, and reassemble it.  It took less than 15 minutes, and cleared up the problem immediately.
By-the-way, those instructions also mention an annual cleaning of the flush valves, which might well prevent future problems.  A filter to remove debris from the water supply is probably a good idea, too.

Mar 09, 2009 | Toto MS853113S#11 UltraMax Round Toilet,...

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