One of the most common plumbing issues, especially for people with older homes, is faucets that stick. Moen is one of the oldest and most reputable brands on the market, but all faucets have parts that need basic maintenance over time. Fortunately, fixing the sticking Moen faucets is not very difficult if you have the right tools. Fix the problem yourself instead of calling a plumber, and you can save a great deal of money. In most cases, a faucet that sticks is due to worn parts, such as handle threads that may have lost their lubrication over time.
Turn off your water line at the main source by finding the main water shut-off valve and turning the valve that regulates the water flow. Check under your sink first to see if there's a shut-off valve, as many updated plumbing assemblies have shut-off valves underneath the sink.
Use a rag or drain stopper to plug the drain underneath the faucet where you're working, which will prevent you from dropping small parts down the drain hole. Place all the parts down in sequential order as you remove them, which will make reassembly much easier.
Pry off the plastic end caps on each of the faucet handles using a flathead screwdriver and set the plastic end caps aside.
Locate the screw in the middle of each of the faucet handles and unscrew these screws with a Phillips screwdriver.
Take off each of the Moen faucet handles one at a time by wiggling them from side to side until they slide off. Oftentimes, especially in older handles that may not come off as easily, you will need to place a rag on the outside of each of the handles and use a wrench or a pair of pliers to gently remove the handles. This will help protect the outer finish on the handles.
Coat the inner threads of the handle stems thoroughly with plumber's grease after each of the faucet handles. These inner threads of the handle stems are often the cause of faucets that stick, so be sure to lather the threads completely. Refrain from using petroleum jelly, as it is more likely to wear off over time. Plumber's grease, also known as "silicone grease," is the best way to ensure your parts stay properly lubricated.
Slide both handles back onto the stems, attach the handles with screws and pop the plastic caps back on to each handle. Turn the water back on at the main water source. Your Moen faucet should no longer be sticking.