...model number unknown. I can remove the handles by unscrewing them and nothing more. With the handles in the fully open position (I turned off the valves under the sink) there is a small opening on the body of the faucet. I thought that I could use an allen wrench but it does nothing.
How do I remove the handle so that I can replace the washer. Thanks.
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i am not sure which cap you refer to. there is a cap just below the handle. turn off the water supply for safety and remove handle then turn the cap counter clockwise. to replace the hose you should only have to disconnect at the handle to the sprayer and the other end at the faucet below the sink. if you wish to remove the faucet then after shutting off the water undo the nut below holding the faucet in place. delta have a good web site where you can see a breakdown of this faucet.
The problem is most likely the seats and springs. You should purchase Delta Part # RP4993. I found some for mine at Lowe's for around $4.00. O-rings are available there too for about $2.00, and you probably should go ahead and replace them as well, especially if they feel dry and brittle.
You have to remove the handle, then unscrew the brass ring (or bonnet) with a pipe wrench, then just pull the cartridge straight out. Separate the lower cartridge from the upper by twisting a quarter turn to the left. Once separated, remove the black rubber seats and springs and install the new.
I have to assume you've unscrewed the face plate, not removed it, because you can't do that without taking the handle off. Delta handle usually come off by unscrewing an allen (set) screw just under the handle itself. Sometimes these are covered by a plastic plug.
Occasionally, even after you've completely removed the set screw, the handle still won't come off. Wiggling and pulling for a few minutes will generally get it off. If not, then a hacksaw, new handle and new cartridge are the answer.
If the allen screw is stripped and that's why it won't ome off, see above.
Tuen the stops off unsder the sink . Remove the alaen screw from the handle. Using a spanner wrinch or a needle nosed pliers spred apart unscrew the large nut that has two slots. Lift the whole assembly out. Take assembly to the plunmbign supply and match ius the kit that youy need with has two new rubber seals and two springs and maybe a new spanner nut. It also comes with the spanner wrench and allen wrench
needed to renstall. Tip you may be able just to tighten the spanner nut(clockwise) and stop the leak w/o rebuilding it.