Moen Faucet Cartridge Replacement Instructions

Hard water and scale buildup in a Moen faucet cartridge will make it difficult to pull out and shut off. There are Moen cartridge repair kits; however, you are better off replacing the whole cartridge. New plastic Moen cartridges, referred to as Magnums, resist hard water scale build up and make the best choice for replacement. The new cartridges are easy for anyone to install. The repair should only take about an hour for the experienced do-it-yourselfer.

Installing a Moen Magnum cartridge will increase your shower faucets performance.
  1. Shut off the faucet’s water supply under the sink or out at the meter. Open the faucet to alleviate the back pressure.
  2. Pop the index button out of the center of the faucet handle with a flat tip screwdriver.
  3. Remove the handle screw with a #2 Phillips screwdriver.
  4. Pull the handle off the cartridge stem by hand.
  5. Slide the metal cartridge cover off the faucet by hand.
  6. Pull the cartridge-retaining pin out of the faucet with a pair of needle-nose pliers.
  7. Insert the white plastic cartridge tool by hand. Rotate the tool back and forth with a crescent wrench several times to loosen the cartridge.
  8. Attach the Moen cartridge-pulling tool to the Moen faucet cartridge, and then pull the cartridge out of the faucet.
  9. Apply a thin layer of silicone lubricant to the outside of the Moen faucet cartridge and insert it into the faucet body.
  10. Reinstall the retaining pin, sleeve and handle. Turn the water back on and check for leaks.

Things You Will Need

  • Flat screwdriver
  • Phillips screwdriver
  • Needle-nose pliers
  • Moen cartridge aligning tool
  • Moen cartridge puller
  • Silicone lubricant


  • Always use the plastic cartridge-aliening tool that comes with each new Moen cartridge.


  • You can break the inside out of the old cartridge.

About the Author

Kelly Schuler is both a writer and a plumber. He self published "Plumbing Do's and Dont's" in 1999. Schuler has been a licensed plumbing and gas-fitting contractor since 2001 and a licensed journeyman plumber since 1986. He actively owned and operated his own plumbing and gas fitting business from 2001 to 2008.

Photo Credits

  • View of Hotel Bathroom image by TekinT from Fotolia.com