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Re: screw end of cartridge is stripped. handle won't stay...
It sounds like the cartridge will need to be replaced. I would suggest you call around to some of your local plumbing supply houses and see if one stocks or has access to Grohe parts. A good parts man may be able to ID the part over the phone, but you will probably have to take the cartridge in so they can match it up. Stay away drom getting fit-all handles for it, as this is only a temporary fix. Replace the cartridge if possible. I hope this helps.
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It sounds like you have something jammed within the cartridge. You can either remove the cartridge and flush line and reinstall it or just buy a new cartridge and replace the old one. The cartridge you need is a number 1222 mowing positive cartridge. Here are instructions to change the cartridge.
MOEN CARTRIDGE REPLACEMENT
There are two different types of Moen cartridge for a single handle valve. The first and most common one is the plastic 1225 cartridge that is used for all Moen single handle valves that are not posi-temp shower valves. This cartridge also comes in brass which is number 1200, but it is more expensive and doesn't last any longer or work any better than the plastic cartridge. The posi temp cartridge is a number 1222. This is the replacement cartridge for shower valves that you turn rather than pull. As you turn the valve it goes from cold to warm to eventually hot. The tools needed for this procedure are pliers, Phillips screwdriver, a small flat screwdriver or awl, a 3/4 inch copper cleaning brush, silicone or heat proof grease, a knife to pull the cap on an acrylic handle, or a 7/64 inch Allen key to remove lever handle.
If it is an acrylic handle simply pry off the cap and unscrew the screw with a Phillips screwdriver. If it is a lever handle there is a set screw which is 7/64 of an inch. Use an Allen key to remove this set screw. If it is a lever handle when the handle is removed you must use a Phillips screwdriver to remove the handle adapter.
Before removing the cartridge make sure that the water is turned off and open the valve to bleed off the pressure. Leave the valve in the open position as it will facilitate the removal of the cartridge if the spindle is in the open position. It can be turned off at the main which is usually the easiest thing to do, or you can remove the faceplate and there may be integral stops behind the faceplate. Use the integral stops if your water main is hard to reach. On the brass spindle of the cartridge there is a notch on one side. Before you remove the cartridge take note of what position this notch is in because that is the position in which the cartridge will be placed. Do not forget this step as a posi temp cartridge will not function properly if installed with the notch in the wrong place. If you install the regular cartridge with the notch in the wrong place, hot and cold will be reversed. Simply remove the handle and spin the spindle 180°.
Pull off the chrome stop tube that encloses the cartridge. There is a horseshoe-shaped retainer clip that must be removed. Use the small screwdriver or all to pry up the top of the retainer clip. A plastic square head removal tool comes with the cartridge that you have purchased. Place this on the cartridge and spend back and forth to loosen the cartridge. Then take your pliers pull the brass spindle straight back towards you. If this proves too difficult and you are unable to pull it out you will have to buy a Moen cartridge pulling tool. Be sure to buy the right tool as they are not interchangeable. The posi temp tool is much fatter than the regular tool. The tool operates the same way a hub puller. Back off the knot on the tool as well as the screw. Place over the cartridge and advance the screw all the way. Now advance the nut.
After the cartridge is removed take the 3/4 inch copper cleaning brush and insert into the cartridge housing while spinning clockwise. When removing the brush also keep spinning it clockwise. After brushing, open the water main for about three seconds to flush the line out.
When installing the cartridge make sure that your notch is aligned properly and that the cartridge is pushed in all the way and that the two tabs on the cartridge are aligned vertically. Install the retainer clip. If it doesn't go in all the way either the cartridge has not been pushed in foreign off or the two tabs are not aligned properly. You can use the plastic tool to align the tabs properly and to help push in the cartridge all the way. Reassemble faceplate and handle and you are done.
You need a #1225 replacement cartridge. Pop the cap off of the handle. Use phillips screwdriver to remove the handle screw. Pull the handle off. Next, unscrew the two screws holding the cover plate on. After removing plate, there should be two integral stops, one on each side of the valve. Close the valves using a straight slot screwdriver. Pull on the brass cartridge spindle to ensure that the water is off. Remove the stop tube, which is a chrome cylinder at the center of the valve body. Look for a brass retainer clip at the top of the cylindrical portion of the valve body where the handle connects. It has a small hole and after you pull it out, you will see that it horse shoe shaped. Use your pliers or an awl stuck through the hole to pull the clip out. Note the position of your cartridge. There is a notch on the end of one side of the brass spindle at the center of the cartridge. Make note of its position. If you install it and get hot and cold reversed, just take the handle back off, and spin the brass spindle 180 degrees. The replacement cartridge comes with a white plastic tool designed to make removal easier. Use it. After loosening with the plastic tool, take your pliers and grab the brass stem. Pull as straight as you can. If cartridge will not budge, you might need a Moen cartridge removal tool. Do not spray with WD-40 or Liquid Wrench unless you like that taste in your water. If your clip won't go back on, it's because you didn't align the two ears on the cartridge. The ears should be at three o'clock and six o'clock. The cartridge must also be pushed in all the way. Good luck!
The spool and sleeve, the part of the Scald-Guard pressure balance valve that blends the hot and cold water, is not working properly. This can is caused by mineral deposits that build up over time resulting from hard water. To fix this, follow the steps below based on your model.
Shut off water supply.
There are two types of valves. Choose one or the other below depending on your series.
1300-1400 Series: Remove handle.
1700-1800 Series: Remove temperature knob, cover and handle.
Twist and pull sleeve to remove it.
Unscrew brass bonnet nut.
Soak cartridge in a 50/50 vinegar and water solution for 24 hours to remove any mineral deposits.
**NOTE** Unless both hot and cold water supplies are turned on, the pressure balance valve will allow only a dribble of water to flow through the valve.
I have put up a picture to make disassembling it just that much easier for you.
If it's like mine, there's a corrugated plastic ring just behind the handle that turns. Pry it back, it releases with clips, and remove the set screw. Once you unscrew it, pull the handle off, then remove the screws for the backing plate which are hidden behind another, clip on shield. You can then get to the two outer and four inner screws that hold the covers over the cartridge assembly which just pulls out. Of course, be sure your water is turned off during all of this.
Anti Scald Valves have an adjustment under the handle (remove handle) to allow so much hot water in no matter how far handle is turned. Its possible that the adjustment is set to allow only hot water in, this of course defeats the purpose of anti-scalding. Check to see if you can adjust this back. Good Luck have a Great Day. Please give a 4 THUMBS UP if this free answer was of any help.
i looked at it and there might be a press in cap with a screw underneath where the grohe label is. there also may be a set screw around the shoulder of the handle where an allen hex wrench fits to losen its clamp on the stem. also.......some handles just snap on and just pull off with some tugging and wiggling them just right.
You will need to turn of the water and remove the handle, then remove the large brass or chrome ring behind the center sleave that is behind the handle. now that ring is what holds the cartridge in the valve body, you will need to remove the cartridge the rubber seats and springs will both need to be changed ,you can buy a rebuild kit for this facuet, it has everything you need even the o rings you will find in there . Hope Ive Solved your problem! Thanks