You may have found a solution to this but if not, since we have Grohe
fixtures throughout our home I've been afforded numerous opportunities
to dissect them (I'm doing one right now.) The cartridge that you are
trying to remove has right-hand thread. It is seal by an o-ring and I
find that this is the culprit when trying to remove the cartridge,
rather than corrosion. When it is compressed a substantial force is
exerted between the underside of the flange (located about 17 mm below
the top of the 17 mm hex nut that you see in your photo. After a half
turn of so the o-ring will become uncompressed enough to make further
turning possible bay hand.
The most frequent drip/leak cause that I've seen is foreign matter on
the seat that then gets imbedded in the washer. The seat seems to
survive but the washer is best replaced.
I sometimes resort to removing the entire fixture and put it in a vise
to remove the cartridge. It is frequently easier in the long run. You
may want to get a 1/2" seat washer before you open the faucet up though.
The washer actually measures 0.65" dia x about 0.1" thick. Grohe's
part number is 05.291.
I like Grohe fixtures and specified them. I have noticed that their
quality is declining. I bought some recently and was not as happy as I
was with the ones bought in 1991. I several identical shower setups and
some are rusting badly while others are not. It looks like they are
skimping of their plating and preparation. Too many visible pin holes
and no apparent use of electrophoretic finishes to seal the surface.
Good luck.
B
Ron in NY wrote:
Hi All,
Can anyone identify this kitchen faucet, and tell me how I can repair it
??? After 18 years, it has started to drip. As you can see, I pulled the
handle, and exposed the stem and nut, but it will not unscrew. I flooded it with
PB Blaster, and let it sit overnight, but it still will not budge. This faucet
might have cartridges, and dissassemble differently--I don't know. I've replaced
many washers and washerless cups in my bathroom fixtures (sink, shower, tub),
but this is my first kitchen fixture. I put a wrench on the hex, and tried to
turn it both ways, but it will not budge. When you turn the handle to start the
water flowing, the stem DOES NOT screw out of the faucet--it just spins and
starts the water flowing. There is a "U" shaped clip on the stem, at the nut
that you can see clearly in 1 of the pictures--that's what makes me think that
there is a whole cartridge in there, rather than a stem and washer. Can anyone
tell me how to dissassemble this faucet ???
RON
Pictures located at:
http://home.computer.net/~rong/MVC-001S.JPG
http://home.computer.net/~rong/MVC-002S.JPG
http://home.computer.net/~rong/MVC-003S.JPG
http://home.computer.net/~rong/MVC-004S.JPG
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