celindion. faucet design. February 23rd , 2018.
To disassemble unscrew the bonnet from the faucet, using slip-joint pliers. Remove the valve stem, keeping in mind this has reverse threads, so unscrew it by turning it clockwise. Older compression faucets may have corroded handles that can be difficult to remove. Most hardware stores and rental centers have a specialty tool called a Handle Puller which makes the job easier.
For pull-down models, the hose needs to be guided through the faucet body and spout, for touch sensitive models, there will be a battery pack that needs to be connected to the contacts.
To disassemble unscrew the setscrew and pull off handle. Though these faucets are washerless, they do have inlet and outlet seals that may leak, or sediment may build up inside the inlets and cause leaks. After removing the escutcheon cap, lift out the cylinder and clean the neoprene seals and cylinder openings. Be sure the faucet is in the "open" position when replacing seals.
To disassemble unscrew and pull off handle. To release the cartridge, use a pair of pliers to pull the retainer clip straight out. Pull out the cartridge and replace the o-rings and seals to fix leaks. You may need to replace the entire cartridge-it is an easy repair that will fix the majority of cartridge faucet leaks. Faucet cartridge come in many styles, so bring the old cartridge to the store. Be sure to insert the new cartridge so it is aligned in the same way as the old cartridge. If the hot and cold are reversed, take the faucet apart and rotate 180 degrees.