Moen hydrolock how to stop leak

How to Remove the Sprayer on a Moen 7900 Faucet

1. Turn off the valves under the sink by rotating the valve handles counterclockwise.
2. Hold the hose in one hand and push upward on the hydrolock connection with the other to disconnect the sprayer from the diverter. ...
3. Pull the sprayer straight upward and out of the guide.

https://homeguides.sfgate.com/remove-sprayer-moen-7900-faucet-83422.html

Buy some plumbers putty.

A common problem with kitchen faucets is the o-rings that seal it become dry. Although they are somewhat lubed at the factory when installing them the installed wipes down the area to clean it wiping off the lubricate. At first the faucet works fine but over time the lack of lube causes the o-rings to become sticky. The easiest solution is to pull the faucet apart and purchase some fuacet lube and lube up the o-rings and parts and re-assemble. If for some reason you have hard water this can cause buildup of deposits and in turn dry out the o-rings and make the surfces rough which can cause the same problem you are having. Again disassemble and clen, lube reassemble.

all moen faucets use a replacement cartridge type packing box, and have a liftime warranty. find a local plumbing supply that sells moen and they should help you get the right cartridge. (it will come with instructions.. there is NOTHING you can do so stop it temporarily, unless you shut off the valves feeding the faucet.

Three years ago, I installed a Moen kitchen faucet with sprayer
in one of my rental units. Moen twice sent replacement
Hydrolock kits, as I couldn't get them to seal. While waiting for the Moen parts to arrive, I used a short length of heater hose purchased at AutoZone, held on by two small hose clamps. After all three Hydrolocks had failed to seal, I just left the heater hose in place. Three years and no problems. ..and no more Moens, either.

Once the Moen hydrolock coupling goes bad it has to be replaced it is not repairable.

I did the same thing recently, that is replaced the cartridge on my moen kitchen faucet to stop and leak, and I also have the same problem. I called moen back and they sent me another cartridge that was supposed to fit tighter, I suppose. I just put the new one in and it still wont stay up. I'm going to call moen one more time and then I guess I'll have to buy another faucet, but NOT moen!!! Good luck with yours.

I NEED TO TAKE FAUCET OFF TO INSTALL GASKET ON THE BOTTOM. BUT I CAN'T GET THE HYDROLOCK OFF.

cartridge does not stop that type of leak. If it is leaking from around the base of the spout it is o-rings that are the problem that are onthe valve after you pull the spout all the way off.

the cartridge if defective,replace it and your leak will stop.