Anyone with ideas on how to open this shower mixer?

Did you try using large adjustable spanner & unscrew the large brass nut.

It will unscrew & pull out, might be tight.

The splined shaft & collar are the only two parts that move, which control flow & temperature as you have marked in pic.

There are no other allen bolts than the two for the cover, which screw in to those threaded holes.
 
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Oh the cartridge unscrews out unlike the video shows? I was going on the basis of that that it needs to be 'pryed' out

I did spin the large nut you mention about 45 degrees (then put it back), oddly didn't try it any further though as I assumed (and it felt that) it wasn't going to get any tighter or looser (going to the above again, assumed it would just spin as it isn't a part that gets tight)

Could try that tomorrow. It isn't leaking now, a bit sprayed out when the mains water was turned back on, but it seemed to stop within seconds. There is definitely something not right but it isn't too serious, would be good to fix it though of course :)
 
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The large-spline/nut/cartridge-body move together? If yes then it is most certainly the cart 5 type. It could be one of the screwed ones but I don't think that's what you have there The front retaining plate fitting and the white seal gives it away.

You turn it to open/close the flow, if you try to turn it any further its attempting to spin the cartridge in the mixer housing. You could damage it internally if you force it.

More than likely it's corroded/scaled in place, quite common apparently. Here's a quote from one of the sellers I came across on removal. You may have 'cured' the leak by disturbing the seals, I would say it''s temporary though, it'll leak again.

PLEASE NOTE: If the cartridge is difficult to remove!

Do not try to unscrew the cartridge

Remove the front plate with the two Allen screws the cartridge should just pull out.

If not remove the plug from the body (Opposite side from the hose) you should then be able to get a screwdriver in underneath the cartridge and lever it forward and out.

You can also remove the two inlet elbows this will allow you to get two screwdrivers in to the rear of the cartridge to lever it forward.

Finally if it is a surface mounted valve and you can’t get to the plug or inlet elbows.

Remove the front plate with the two Alan screws, then reassemble the knobs loosely you should then be able to fit two screwdrivers in behind the knobs and lever them forward against the valve body
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Nightglow said:
You haven't got that one as it has a splined shaft each end.
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No I don't think so. It's the right one, the cart 5 has a ceramic disk valve built into the back which is the rear spline you can see, this locates into the mixer body. The locking ring and seal are also a good indicator, also if the nut and spline move together.

SK971007
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OP's
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cart 5
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It won't, and not a good idea to force the nut. Could damage the cartridge if there are stops in the rear valve. Take a closer look, there's no external thread on it. It's retained with a face plate.

From the service manual.

Removing the cartridge
1. Turn off both water supplies to the shower valve.
2. Remove the indice from the centre of the temperature control handle.
3. Remove the centre retaining screw.
4. Remove the temperature control handle assembly, by pulling it off.
5. Remove the circlip and then pull off the flow control handle.
6. Unscrew the two screws.
7. Remove retaining ring and slip ring.
8. Pull the cartridge forwards to remove it from the shower body.


Tip: If the cartridge will not pull out of the body with ease,
replace the temperature control to provide more grip and pull
the cartridge out of the shower valve body.

If this is still to difficult replace the flow control and the circlip
and insert a broad flat headed screwdriver between the flow
control and the body and twist the screwdriver to ease the
flow handle away from the body. This should allow the
cartridge to be pulled out
Click to expand...
 
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It would make sense if it pulled out, as otherwise that retaining clip seems pointless to me as it has no use if the cartridge screws in

One plumber has told use it would unscrew (just what he thinks by looking at the pic) and another has said just to replace the whole unit as it is easier haha

I think it does pull out, it's just stuck

Will have to do some more trying and investigating. Unfortunately the flow control isn't actually metal as it seems in one of the videos (as ours is a slightly different older model), it is plastic and not strong enough to wedge a screwdriver behind to pull the cartridge out with
 
I'd knock up a puller for that job. Bit of wood or a socket the same diameter as the outer ring of the mixer body, inside bigger than the cylinder OD (white ring). A face plate with a hole in bit bigger than the bolt, again just a piece of wood or metal. A bolt all the way down into the end of the cylinder, on as much thread as possible. Then run a nut down the thread onto a washer and it will evenly pull the cylinder out against the mixer body. Attached a sketch.

ockg.jpg
 
fornowagain said:
I'd knock up a puller for that job. Bit of wood or a socket the same diameter as the outer ring of the mixer body, inside bigger than the cylinder OD (white ring). A face plate with a hole in bit bigger than the bolt, again just a piece of wood or metal. A bolt all the way down into the end of the cylinder, on as much thread as possible. Then run a nut down the thread onto a washer and it will evenly pull the cylinder out against the mixer body. Attached a sketch.

ockg.jpg
Click to expand...

That's a very good idea actually thanks! Might need to do that

Will just have to find a bolt that fits
 
All sorted! Thanks to all for the advice

The cartridge was freed by forcing it from behind (by accessing it from above, through the shower pipe hole) and it seems there was one seal completely missing, out of 4.

Replaced that seal and it seems fine so far, touch wood :)
 
Hopefully someone will be able to help me. I am trying to remove a shower that I believe to be identical to the one pictured in this thread. On removing the inlet pipe flanges there doesn't seem to be any hint of how the pipes are actually held into the elbows! There are no nuts, just the pipe entering the elbow which is completely rounded (ie no flat edges to 'unscrew' anything. How do I get this thing off the pipes?
 
Jaason said:
I would put an image but can’t work out how to upload one?!
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Cant help you with the mixer Im afraid but.......

https://forums.overclockers.co.uk/threads/useful-information.18814339/
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Click to expand...
 
Jaason said:
Hopefully someone will be able to help me. I am trying to remove a shower that I believe to be identical to the one pictured in this thread. On removing the inlet pipe flanges there doesn't seem to be any hint of how the pipes are actually held into the elbows! There are no nuts, just the pipe entering the elbow which is completely rounded (ie no flat edges to 'unscrew' anything. How do I get this thing off the pipes?
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Sorry I've never completely removed ours so can't say Hope you work it out

Edit: just checked with my dad. He said a neighbour also has a similar one and thinks (isn't sure) the connections you see are fixed, and the actual connection you can remove is behind the plasterboard and tiles possibly??
 
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