Question about Moen 3175 Legend One Handle Shower Faucet With trol Pressure Balancing Valve....

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Moen bath valve is tight and wont shut off without holding knob i

I have a moen bathtub valve that is probably 30 year old and is very tight to turn on tand pops back out after water is shut off. If held in it will eventually stay off. Want to know how to fix problem. It is a single knob style with screws on cover plate directly across from each other.

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These are not only long-lived and reliable but also fairly easy to service.

Turn the water supply off!

The trim cover must be pried off (sharp knife slid under the edge) and then I think there is first a Phillips head that holds the knob on.
Our Moens always came with the necessary wrench to loosen the slotted nut but I think they are also included in the seal kit you should find at any chain 'home improvement' store. It's a simple stamped 'key' used for removing the nut.
I recall that the kits once had illustrations to guide you.

After cleaning up the cylinder and the piston that carries the seals ('O' rings) I have some silicone grease (not heat sink compound-it's gritty with zinc oxide) I use for reassembly; it makes them feel like new again.

With a gentle twist of the piston, slide the renewed assembly back into the cylinder and reverse your removal steps.

Posted on Nov 12, 2008

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