Shower - Two Valve - Large valve bodies when plastic knob removed, never seen such big valve bodies, cross on front, don't know how to withdraw from wall??
HELP, Cold Water valve body leaks when in use, shuts off "OK "

Can you post a photo of this faucet ?

Yes, thanks for your response to my question... Milo

Thanks for posting the photos. It is a great help...

Ok, I don't know if I am correct in identifying brand of this faucet, but I think it is old Price Pfister unit. They are quite a common faucets.

The chrome cup with X in it is actually removable piece of trim. It is attached to the actual faucet stem with the same screw as the plastic handle. During installation, as you screw in the handle, the handle will snaps into the groves and will push this cup piece firmly onto the stem. During de-installation, once you removed this screw, there is nothing else that keeps it attached to the stem.

These cups usually are hard to remove but with a bit of effort, and patience, you can do it. As I said, once you remove the handle screw, there is nothing holding it in. What I usually do is that I take a large screw driver and easily tap it with its plastic handle from top, then bottom, then left than right. Every few tops a try to wiggle it out with my bare hand. If still too firm, I continue tapping it. After while you will feel the back part of this cup to develop slight movement. That's what you want. Once you detect the movement try start wiggling it out by hand. It will become looser and looser and eventually it will pop out

I never try to pry it out by placing screwdriver behind the cup and prying it towards me. Usually, pressure of the screwdriver on the cup will damage it.

Once you take this cup out, there is escutcheon. Remove it as well either by hand or with channel locks. Once out, you will see actual stem. Insert plumber's socket of correct size and remove the stem.

Let me know how you did...

Once you get the cup off, with Milos' help, you probably only need to tighten the packing nut around the stem since it only leaks when the valve is open and turns the water off OK.

Harold nailed it! Let me add a bit more. If this is a bonnet packing nut leak from around the stem then follow Harolds advice. However, do it this way. Turn on the valve until it starts to leak. Began to snug the bonnet packing nut up clockwise until the leak disappears. STOP!! Do not overtighten.
Now replace the escutcheon plate, cup and knob and you're back in business. Good luck, Tom

Thanks MILO & Company, you guys are great... will try to repair and let you know >>
AGAIN THANKS FOR YOUR TIME & EFFORT
Michael

Took off trim [ took a while to rap with screwdriver handle ] & escutcheon and adjusted packing nut [ just a wee bit ] and now everything is terrific.
Thanks again for the TEAM EFFORT you guys are great! And the valve is always DRY.
Michael

borden25: glad we were able to help you - and save you few bucks on potential service call !

All's well that ends well! If you ever need us again we're as close as a click.
Tom