Moen Shower Faucet Replacement Cartridge

I have recently had a problem with my Moen mixer for the bathtub. As I searched the Internet for some insight before I attacked the faucet, I found very little in the way of images or step by step instruction. So, being a long time Maker and long time Instructables user / contributor, I thought I would fix that issue and share what I learned. In fact, I will take things an extra step and say that if you are careful, you may be able to actually fix the problem without a new cartridge. My mixer control is shown below. You simply rotate the handle to get the right temperature.

On models that require you 'pull out' first and then turn to 'mix' this information probably will not be as helpful. I needed the following tools: Allen Wrench (only for handle set screw) Vise Grips #2 Phillips Screwdriver Standard Screwdriver (small).

Moen magnum, faucet cartridge, genuine, fits all single handle style valves. Fits all Moen 1 handle faucets (excluding Posi-Temp and ExactTemp) Installation instructions included Includes twist cap to loosen installed cartridge Moen genuine part. Moen® Posi-Temp® Single Handle Tub/Shower Replacement Cartridge.

This is the hard part. There is a lot of rubber surface area which may have grown attached to its surroundings inside the pipes. Getting the cartridge to start moving was a task.

Most important, you do not want to break something inside the wall by prying or tugging too hard. What I did: I took the Nylon fittings and reversed the white ones so that they were longer by the length of the geared section, (back to back instead of front to back), then I placed them over the exposed spindle. Next I placed the black Nylon piece into its original home, inserted the screw and slowly tightened. This created mechanical force between the pipe and the cartridge that literally leveraged the cartridge forward almost 0.25 of an inch. Once the cartridge began to move, I removed the Nylon parts and set them aside again. Now, using vice grips on the flats of the spindle I was able to pull straight out to remove the cartridge.

This still took quite a bit of effort. In the second image, you can see the cartridge almost free of the pipe. Using a very small screwdriver or blade type tool, very carefully pry all around the edge of the plastic retainer. It will only come up a teeny bit before it lets go.

Set the retainer to the side. You can now try simply dumping the last part out of this section of the cartridge since the retainer is no longer there to keep it. However, if it does not freely fall out, this may be the problem with the cartridge.

Using a flat blade screwdriver, insert the screwdriver into the end where the retainer was and gently twist the inside section to break it loose. Next, using the holes along this unit, help the inside piece to come completely out.

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If you came this far, hopefully you discovered that inner piece was stuck and causing problems. Now, you need to clean everything. You may want to soak the parts a few minutes in vinegar and then rinse with water before re-assembly. Keep in mind your water is still turned off and turning it on would be messy right now.

I wiped my parts really well with a rag and was successful. Simply reverse this whole process for re-assembly, pushing parts together and being careful not to bend, flex or otherwise do anything to break them. Applying some plumbers grease can make the re-assembly easier. I hope this helps you as much as it helped me.: ) By the way, don't forget to double check everything and that the retaining clip is installed before you turn your water back on. Now that you have a fully functional bath tub, get some candles and bubble bath for your valentine! Home Depot and others sell a repair kit #98040 called PosiTernp 1222 Cartridge Repair Kit. You get new rubber parts, the plastic that goes around the brass stem, grease and allen wrenches along with a plastic removal tool.

Just finished the job. What a bee-ach getting the cartridge out. Injected vinegar and Lime-a-way toilet cleaner into the works. The plastic removal tool allows you to rotate the cart back and forth.

I placed vice grips of the stem and pulled and pulled and rotated the cart. Little by little it started coming out. A lot of muscle was needed. I injected hot water and dish soap as a last resort.

I finally got it out. The o-rings and pads were trash. The author of this piece fails to include the removal of the retention clip.

That's the first step before trying to remove the cart. I rebuilt the brass stem with the kit, o-rings and pads, grease, and inserted the cart into the valve. I could not get the retention clip to snap in like they show on the Moen vid. Apparently I could not get the cart inserted the last mm.

So I installed it all without the clip. Works like new. I would never buy a Moen again. Spend more money and get something with a ceramic cart. I just cleaned out my own Moen Cartridge and even though my cartridge is a little different, these instructions were spot on! My showers were always changing from scalding hot to freezing cold sporadically, but this fixed it. Make sure the water is turned off before you pull the unit out (I forgot!).