Step 1: Turn Off the Water
For this method, turning off the water under the sink is a safety precaution
Step 2: Twist the Handle's Base
While holding the faucet's handle arm in place, rotate its base counterclockwise, and remove it.
Step 3: Remove the Screw
After removing the faucet's base, remove the screw inside. Hold the underneath centerpiece and use a screwdriver.
Step 4: Pull Out the Cartridge
After the screw is out, you will see a white cartridge underneath. Remove it using nosed needle pliers and replace them. Unfortunately, many people have expressed frustrations while removing cartridges using pliers. To avoid such, buy new bathroom faucet renowned brands like Delta and Moer. Such brands offer full support in case of a problem, and you will always get the replacements you need.
There will be a set screw beneath a decorative cap or behind a tiny red/blue plug.
The following answer is generic for Delta two-handle faucets since no model or type description was given.
Every Delta faucet with separate hot - cold valves that I have seen has a screw hidden under a trim cap on the top of the handle. The cap pops off with fingernails or a small flat-blade screw driver under the rim. Remove the screw with a #2 Philips screwdriver and pull the handle straight up (sink faucet). Usually it comes off easily. If it doesn't come off, and there is a lot of lime buildup around the faucet due to hard water leaking out, you may have to soak it with vinegar or CLR to soften the lime in the shaft. That would be unusual; lime doesn't generally stick to plastic.
Use the special tool for pulling handles.
SOURCE: Adjusting single leaver faucet handle
The little wrench tightens the tension ring that fits on the inside of the retaining nut right under the handle. You fit the little "arms" in the notches.
SOURCE: replace delta single handle shower cylinder
Yes, I believe this unit uses a cartridge right? They do fit a little tight due to the small washers on the back side of the cartridge. If this is the one I'm thinking of, there are two leg like appendenges that come off the back and fit into small holes at the back of the manifold or what some call mixing valve housing.
SOURCE: I cannot get the set screw out of a Delta
You can't apply any worthwhile heat to try and free this off without causing further damage, but if you have a pipe freezing kit handy you can try freezing it a few times and then pouring boiling water over it to thaw it suddenly. The thermal shock sometimes works but it's not a sure enough thing to be worth specially buying a freezing kit for.
That leaves two other possibilities: drill the screw out and get a replacement (or adapt one from another machine screw) or partially drill it and use a very small stud extractor. If the screw is brass then just drill it out in my experience as stud extractors just don't work on small diameter non ferrous materials.
If you drill the screw out then you need to use a drill bit small enough to go down the centre of the screw without damaging the threads, but large enough to leave it sufficiently thin-walled to be able to collapse inwards when you subsequently winkle it out. Usually I find that a pin punch driven anticlockwise against the thin rim left after drilling does the job.
SOURCE: delta single handle faucet leaks
BEHIND THE HANDLE THERE SHOULD BE A SET SCREW THAT HOLDS THE HANDLE ON THE STEM. THE SET SCREW WILL BE BEHIND THE LONGEST PART OF THE HANDLE LOOK AROUND BACK OF THE HANDLE. AFTER REMOVING THE HANDLA THERE WILL BE A STEM AND A NUT THAT HOLDS THE ASSEMBLY IN THE HOUSING
SOURCE: How do I remove delta 470 kitchen faucet? It won't swivel
If the 470 is typical, there should be two large nylon nuts on the bottom of the faucet tubes that hold the faucet to the sink. First, turn the water off, then open the faucet to drain any pressure. Next, disconnect the feed lines (hot and cold) that connect to the faucet from under the sink (be prepared for some water back flow, so paper towels would be a good idea). After the feed lines are disconnected, you should be able to reach up (usually behind the back of the sink basin) and access the two large nylon nuts (one on the cold and one on the hot). These nuts typically have raised portions so that you can get a grip on them. If you are lucky, you will be able to turn them (lefty loosey, righty tighty) by hand. If not you may have to work for some time with various pliers or other tools getting them to turn. Once you have them off, the faucet will simply lift up from the sink. Installation of another faucet should simply be the reverse procedure.
Good luck.
I have extracted the legend of figure 5B of the installation instruction here for your reference:
Remove handle from the faucet by loosening set screw (1) and pulling off handle. Once handle is removed, loosen set screw (2) from the bottom of the handle, remove accent (3), replace with new accent, tighten set screw (2), replace handle on faucet and tighten set screw (1).
Here is the link for the installation instruction:
http://www.deltafaucet.com/media/MandI/40033RevC.pdf
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