To replace a Moen faucet cartridge, start by shutting off the water supply to the faucet. Remove the handle cap, and locate the screw on the handle. Take the screw out, then pull the handle off. Remove the clip by inserting the edge of a knife into the hole on the clip and moving the knife upwards. Locate the cartridge. Pull the stem out with a pair of pliers. Use a Moen cartridge puller to replace the cartridge easily.
To use the Moen cartridge puller, attach one end of the puller into the stem. Ensure that the puller is tightly placed in the groves of the stem, then turn the puller from side to side to remove the cartridge. Once the cartridge is removed, install a new cartridge in place of the old one. Apply grease to the o-rings of the new stem, and put the clip back in place. Turn the water supply on. Confirm that the hot and cold water directions are working correctly. If they're not, turn the center stem 180 degrees, then reassemble the faucet.Learn more about Plumbing