If your valve is single handle there is usually a small button type of cover for (sometimes rubber the size of a pencil erasure) that covers acces to a hex key screw that you have to remove to remove the handle
once you have removed the handle you will need a large adjustable wrench to turn a large nut that holds the cartridege tighten if still leaks remove and replace you can math the assembly at HD or Lowes
a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Repairman (only for users in the US for now) and get all the help you need. Goodluck!
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turn off the hot and cold water supply, place a container under the sink where the hose meets the Sink mixer. release the pressure from the tap by opening the tap to let the water out. use a suitable tool to undo the flexible hose from the underside of the tap, there should be a small "O" ring on it which you will have to replace as the "O" ring is possibly the cause of the leak.
The first solution is of course correct. However I found it almost impossible to remove the spout assembly. It was very stiff and it was difficult to get any leverage to force it off without damaging the finish to the tap as a whole or damaging the sink.
What I found was that if you poured boiling water over the tap/faucet it eased the stiffness and having done this several times - ie about 5 kettle loads of hot water, I managed to remove the spout. It helps if you reconnect the hose directly to the outlet under the sink (ie not via the faucet). THis allows you to run cold water through the tap whilst pourung boiling water over the outside of the tap. The cold water shrinks the copper/brass components whilst the hot water expands the spout assembly. Once off, it is possible to clean the inside of the assembly to remove corrosion or calcium deposits to say nothing of old "O" rings.
I also used a kettle descaler between dousing with boiling water in the hope that some of it would seep down within the assembly.
It took me three attempts to do this. I was almost going to spend UK pounds 430 or US dollars 670 and buy a new unit. So do not give up and I hope this helps. It swings backward and forward now perfectly.
ooops, didn't mean for that to be a request, sorry...It was a solution. Although, if you dont want to deal with Moen, you can get one at your local plumbing suplly store. I recommend taking the old one with you (make sure you shut the water off first!). Again, good luck