How to Repair a Moen Shower/Tub valve



Gregg check Ramona's plumber here today we're going to talk about how to service the Moen posi temp shower valve if it be just for the shower or the table or both this is the cartridge we will be using this is an OEM product original equipment by the manufacturer not a good idea to go with the import versions on this particular project so let's step in the shower and see if we can keep from getting too wet so let me go through the steps of what we're going to do first we'll turn off the water and we'll drain it down waters off and because it's off the water is not flowing right now so I can get to this screw now keep in mind where the lever is in the on position right now I'm going to take this screw out of here and I'm going to turn it back to the off position so that I know it's in the off position because rotationally that means something in a few minutes then we're going to see the the way this turns clockwise is off and this little stop right here is up against that Ridge we're going to take a screwdriver philips it is and we're going to pull off the handle adapter and set it down exactly like we pull it off so that we don't forget where where this goes and also this is a stop limiter which you can rotate in two different positions to have it not get as hot as it could otherwise it would it limits the heat of the rotation of the knob this particular one is in the full hot position where the limiter is at maximum angle now this limit of assembly is not essential for the valve to operate as essential for the valve to operate as designed having the limit the heat limiting function so if that is in a different position other than straight up note it and keep it keep them together in that position and your limitation will be retained at the same temperature we just pull off this collar and it just slides right out no screws no no attachments and inside under the collar is the cartridge now this is what we're going to pull out and it's not going to come out until we pull this clip this clip comes straight up this is a very important part of any single handle Moen cartridge here's the clip it comes out you set it down it'll always go in from the top but here's here's a part now that you want to be very aware of and the tool that comes with the cartridge is this little goodie this little goodie will go on here and it will rotate this this cartridge body now I'm looking right now and I don't know if you can see it but it says H and C that would stand for hot and cold now this valve physically will go in with the agency on the bottom if it was in that way then you need to put the new one back that way because that's where the house is piped if it's on top then you need to put your new cartridge with that back on top so now that we've we've identified which way hot and cold is we'll see if we get lucky and if this just slides out of here with a pair of pliers if it doesn't slide out easily we use a poor because you may not want to buy a puller but once again if this is a weekend you should buy one in advance now here we have it's being a little tough so we'll try using the key tool and we'll try rotating this cartridge breaking it free from its kind of stuck in place position by rotating it and as you can see I'm just going to break this plastic piece so I'm not going to pull it out with pliers so it's a good thing I have my puller you take your now this this is the Magnum or it excuse me this is the posi cap polar not the other polar this is the big one and the other part will not work on this valve so you stick your cartridge polar on there this screw goes into the breast inner stem hopefully will stay intact with the cartridge as we very carefully pull this cartridge out of the faucet body and what I mean by carefully is if we don't yank around and force it we slowly tighten this collar down it's kinda like a wheel puller I've got tension on I'm feeling that at the barrel tighten down and I'm going to try to rotate it a little bit which is what I was trying to do a minute ago okay I just felt it burn you can see that it turns it broke loose now it's just going to pull out once again I'm making sure that I knew that HTC were on top so I'm setting this down and I'm feeling in here for any debris and it's natural for water to come out like that because the pipes are just straightening down to be careful to be sure I'm going to look in there to make sure I don't see any long sticks or twigs coming into the valve body from the water system and there it's free there's there's no there's no lovely debris in it hopefully this cartridge is going to slide right back in there if it doesn't and it's really corroded in there you could take a little bit of a steel wool very fine steel wool and very lightly clean it up or maybe one of those three the green 3m scotch brite pad I'm going to put the H and C on the top push it straight in now I'm not pushing on this part I'm pushing on the body and I'm pushing it all the way in so that the keyway lines up it's fairly self-explanatory the clip goes back in it must go down all the way or the collar won't go back on and sometimes you have to play around because this clip add there it goes the clip goes through a slot here and a slot here now that you've got the clip back in you can turn the water back on and put it all back together what I'm going to do is turn the water back on and before I put the handle on and everything and make sure that when I turn this on from the off position that cold comes out first then it blends and then it goes all the way to hot and then it turns off back clockwise to turn it back off to cold it should always be such that the cold comes out first and then as you rotate it becomes hot the valve stops if you're using the limiter in here and your limiter is other than straight up with this knotch you could have it so that it'll only turn on and only go up to maybe ninety or a hundred degrees or something that's that's your temperature choice if you're not going to have it work as a limiter you don't even need to have this in there but it's a good place to store it so we'll put it in there and we'll in the water back on and we'll check our our polarity interflow now we've got the water turned back on the cartridge is in the off position and we're going to find out if that inner stem was in the correct position rotationally we know that but the body of the stem is because we put the agency on top so what will dip will turn the cartridge on I could put the handle on here but but it doesn't look much different I'm just doing this and that should be cold first and then it should get warm and then it should get hottest right there but checking it to be certain that that is definitely warm that is definitely cooler and that is definitely cold and that is off and it's not dripping now if it would have been hot first then mixed and then cold all you would have to do because you know your outer body is correct all you would have to do is rotate this stem from the off position 180 degrees put your limiter back in the position you want it in in this case we're straight up no limit and you're good to go and you could you don't have to turn the water off to take to rotate that stem now all I'm going to do is put the screw back in the handle adaptor which is I believe always a Philips now we don't have to go behind this discussion this repair plate here because there's nothing serviceable behind there well that's why those screws don't matter and the owner's manual for this cartridge is in the bag and the instructions are in there and it is in writing for you if you forget we put the handle back on here now what I'm not doing is I'm not going to turn this thing upside down so I can get to it easy because I don't want to get my knees wet instead I'm going to try to run that Allen screw from the bottom and that Allen screw on these newer positives turns quite quite a bit before that screw drives all the way home now right now I can see that the tub spout isn't dripping I can see that that's called next to meThe hot it's not dripping and we have successfully changed a Moen posi temp cartridge can you do it yes you can and I can help thanks for watching Ramona's plumber calm and DIY plumbing advice calm thank you you

27 Comments

  • RZ H

    April 15, 2019

    Couple of things. Use plumbers grease , not Vaseline or petro based lube, on the new cartridge body and o ring before installing it. Suggest you also put anti seize lube on the threaded parts to make it easier to remove next time (year’s away). Finally, the brass stem has a notch on the very end of one flat. That notch goes down towards the drain. That orients the handle correctly as he states.

    Reply
  • Sean Mark

    April 15, 2019

    what is part # for your handle. i have the same moen cartridge but i have crystal clear handle and it keeps breaking. thanks

    Reply
  • Francisco Rodriguez

    April 15, 2019

    What size alley key did you use?

    Reply
  • El Villegon

    April 15, 2019

    For my Spanish speaking people

    https://youtu.be/nQ2vmK0XgzY

    Reply
  • Henry Wong

    April 15, 2019

    This is the best tutorial video, very thorough. Thank you!

    Reply
  • SD Zoom

    April 15, 2019

    Where can I buy that same puller as you? The ones for sale are aluminum and the prongs bend. They are terrible. Looks like yours is solid steel and commercial grade.

    Reply
  • Aleks Hristovski

    April 15, 2019

    Will this fix stop the squealing sound that is coming from my Moen faucet?

    Reply
  • Al Stodolski

    April 15, 2019

    Without a doubt, straight forward no nonsense and VERY helpful and informative video.

    Reply
  • Edbert2004

    April 15, 2019

    My root problem is that the screw for the handle is broken off. I thought it would be a good time to replace the cartridge since it is about 20 years old, but without being able to connect the screw I cannot use a puller like that. Any ideas?

    Reply
  • papa bits

    April 15, 2019

    Plumber in a white shirt?

    Reply
  • James Harris

    April 15, 2019

    Do you have a video for when the cartridge has been stuck for over 10 years in a bathroom that is unused?
    BTW–> Great video, well lit, stable camera, clear sound no beating around the bush.

    Reply
  • Brian M

    April 15, 2019

    My original moen shower handle system lasted nearly 12 years, the handle broke, I used the OEM replacement and in the last 4 years I have had to replace that handle 8 times so far. WTF is up with the OEM.

    Reply
  • Joe Public

    April 15, 2019

    Ramona looks like a bald man or a really ugly woman

    Reply
  • Stuart Stuart

    April 15, 2019

    Very helpful video. Thank you

    Reply
  • Ernesto Valdes

    April 15, 2019

    This is as good an instructional video as they come. Thank you.
    It definitely made me get a puller. I thought I was doing something wrong since the cartridge was not coming out at all. Thanks again.

    Reply
  • You Tuber

    April 15, 2019

    @2:20 those two white things needed for it to function? I don’t have those

    Reply
  • Jay Karber

    April 15, 2019

    This is a great video! Thanks for being so helpful and going through the process step by step. This was my first time replacing one of these, and it would have been much harder without your tips. I bought a puller tool, and it was a big help. Keep up the good work!

    Reply
  • tasha c

    April 15, 2019

    You saved me money too. After 2 trips to the hardware store I was able to fix my shower. Plumber charged me 236.00 for the same issue in another bathroom. Great demonstration!!! Thank you!

    Reply
  • Joe Medina

    April 15, 2019

    FANTASTIC video. Had all the parts but didn't know what the hell I was doing. I followed along, step by step and finished in time for dinner. Thank you!!

    Reply
  • Jose Mata

    April 15, 2019

    Moen cartridges Suck mine broke off….

    Reply
  • pietrosammarco

    April 15, 2019

    The white collar plumber! 😀

    Reply
  • fxd3

    April 15, 2019

    Just a quick thank you for posting this how-to. You saved me a bunch of money by showing how to fix my shower myself.

    Reply
  • Ryan

    April 15, 2019

    What size Allen wrench at the beginning for the knob??

    Reply
  • thang le

    April 15, 2019

    O this is to stop leaks right?

    Reply
  • A Dominguez

    April 15, 2019

    I had absolutely no trouble with the cartridge, came out without using a polar. However, the black plastic black ring gave me a devil of a Time!!! I was terrified to break it!!! I can't believe you were doing this in a crisp white shirt!!! Thank you for the video.

    Reply
  • Nicholas Stroganoff

    April 15, 2019

    The "U" clip would not go in until I pushed the bottom of the clip so it would align with the bottom groove.

    Reply
  • Goran Milanovic

    April 15, 2019

    Thank you help me out so much

    Reply

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