I replaced the stem on my tub and now the water will not cut off. part # RP1740C. What do you think the problem is

to replace the roman tub faucet you have to expose the faucet under the deck of the tub. Most of the time builders do not install a door to do repairs. So expose the underside of the deck of the tub, turn off the main water outside then cut the water pipe for the hot and cold water with a tube cutter. At this point take a sawall and place the blade so the side of the blade touches the bottom side of the deck.
and cut all the way though the body of the stem.

Do all three and your done with the hard part. Install your new faucet and enjoy.

Hope I was help to you Rich

You can replace the assembly and not have to worry about taking apart the stem or, you can get a replacement diverter. The spout will twist off turning counterclockwise.

The mounting stem needs to be replaced. This page shows how to replace the tub seal and the mounting stem. If your washer isn’t leaking water then you only need to replace the mounting stem so all the steps are not necessary. http://appliance-repair-it.com/Maytag-tub-seal.html

Replace the valve stem or have it replaced. There is a special tool to unscrew the valve stem. Remove the wheel and tire from the car and depress the pin in the stem to release the air in the tire. When you have about 90% of the air out of the tire, insert the tool into the stem an turn counterclockwise to remove. After you install the new valve stem, get a ride to a gas station that offers free air and fill the tire up. As long as the tire is still seated to the lip of the rim (check just for your safety but I very highly doubt it unseated from the rim) and fill the tire to the cold psi rating which is stamped on the sidewall of the tire. If you want to check the tire itself for a slow leak prior to doing the steps above, here is what to do. Get a pan or plastic tub that is sightly wider and longer than the tire and rim. Fill the tub with water and set them it in the water (while it is still filled with air) and slowly roll the tire in place and look for small air bubbles to rise. If you see bubbles, there is a leak.

tub seal is the problem. where the transmision goes through tub.

this sounds like a ge ? if so you need to remove front cover between the top and the front cover you will see a small gap on both sides you will have to put a putty knife in about 2" from the ends and push in
once removed on the left side of tube you will find a small rudder hose pull the hose of clean in side of hose with small screw driver also fill washer with water with hose of untill water leavel is to the center of the box now use a turky baster to force air in to tub by placeing baster over the stem wher the hose was force air in to tub fill washer a lititle more untill water shots out of stem stop washer and drain all the water out cut about 1"off hose reinstall stop useing liqid soap

you must replace the whole stem.you can get it at homedepot. first take the cover off over the stem. this should screw off or is held on with a allen key.then unscrew stem from valve body.make sure water is off to tub,just in case.

If the water is off but still coming through, open a tap or two on one of the lower levels.

Basically the old stem does come out thru the top of the valve. Hopefully Moen sent you the tool to do this job. The tool is a 3/4"diameter about 4 inches long. Even on one end and two little tabs on the other.

Take the handle off stem. Remove the upper retaining nut, usually chrome. Pull out the two plastic upper stem pieces. Insert the 2 tabbed end into the stem area. You will feel the tab drop into the retainer ring. Slowly rotate the retainer ring out Counterclockwise. After the retainer ring is out then put the long screw in the stem and pull it out. Sometimes a little leverage helps here.

You will have TWO retainer nuts. The first one is easy just under the handle, the second will require the special insert tool.

Please rate this response and good luck, Phil