My delta two handle bathroom faucet the cold water handle is hard to operate tried wd40 on it and it worked for a while but it got hard to operate again

Use the special tool for pulling handles.

My bathroom faucet handle (not same brand as yours) was so hard to turn that it pulled the base around with it on the vanity when I jerked it. I used an Allen wrench to take out one of the set screws holding the handle on, put the tiny straw of a WD40 can in the set screw hole, squirted WD40 inside the handle, replaced the setscrew, and worked the handle to and fro a few times to lubricate the inside. No more sticking!

Check the water supply lines to the shower at the faucet handles. If the fitting for the hot water line connected to the handle is loose, it can twist and kink off the water supply further down the line when you turn the faucet handle. I'm not exactly sure how this could be relevant otherwise, but under normal design circumstances this type of scenario with your shower wouldn't matter for other faucets.

Go to delta website, take a picture of faucet with your cell phone and send. They should be able to identify and send you the parts. Meanwhile you'll have to turn water on and off from the emergency shut off valve under the sink. If it looks like the picture, it's probably the rubber seat and spring. If you don't want to wait go to your local "hardware" store. There may be someone there to help you. Bring the stem or cartridge, along with the rubber seat and spring. Don't use cold water while stem is removed. Turn cold off as well to prevent a mishap.

You need to take the handle off...ususally held on with a small allen screw on the bottom side of the handle. After removing the handle there should be a dial setting.

Before taking it apart, you need to turn off the cold and hot water valves under the sink. Once you have done that, open the faucet and let the remaining water run out into the sink. Since I am not sure what the age of your faucet is. I will be using instructions for a common Delta faucet.

1. There is a hole towards the bottom of the handle in the front. It may have a plastic button there. If so, pry the button off with a very small flat head screwdriver. Try not to damage it.

2. If your going to replace the seals, it is best to by the rebuild kit that comes with a special tool. It includes the allen wrench and spanner wrench in one. And all necessary parts to rebuild it.

3. Once you get the handle off, you will see a dome shaped part with two notches in it. It may have ridges on the side of it. That is the special fitting that holds all the parts down.

4. Remove the dome shaped part with the tool provided with the parts kit.

5. Replace all parts that match yours.

6. Install everything in reverse order and you should be good to go.

Don't forget to vote

Everyone have a great Thanksgiving

Hi,
The hole under the seal and spring for the cold side is plugged with dirt....
a small screw driver will sometimes do the trick, and sometimes you need to unhook the piping underneath and blow air back through it...

heatman101

You would have to open up your drywall, cut and re-solder a new single handle faucet. An easier approach could be to shutting off your water supply, draining the lines in your bathroom from someplace below, and then trying to fix the bad soldered joint if you know how to do so.
I hope this helped.

bad faucet...get new at lowes or home depot

Yes, you are on the right track, but Deltas use a fancier kit inside them. It is quite a bit pricier than an O ring, but will solve the problem. It is not hard to install at all.