Advice on opening push-button cistern lid

[cal_rourke]

Hello,

I have a Grohedal branded, single push-button flush toilet that I inherited on buying a new house. It has now developed a leaking problem on flushing such that on each flush, water spurts out from one side of the cistern where the lid is attached.

So, I naturally tried to take the lid off to have a look inside - and that's where I'm stuck. The lid is attached to the cistern somehow and I can't see how to release it.

The push-button collar rotates a little but does not seem to unscrew. Inside the push-button holder there are no screws or catches or anything that makes it obvious how to release the lid.

Pictures:
http://www.manwomanandmyth.com/images/wide.jpg
http://www.manwomanandmyth.com/images/Button_on.JPG
http://www.manwomanandmyth.com/images/open_1.JPG
http://www.manwomanandmyth.com/images/open_2.JPG
http://www.manwomanandmyth.com/images/open_3.JPG

Any advice much appreciated as Google returns not-a-lot on Grohedal!

Cal.

 

[Bahco]

Can you not remove the button by flicking up and then you can see the screw underneath?

 

[Paul Barker]

grip the outer chrome effect plastic part and turn anticlockwise to unscrew it from the drop valve.

When you get in there, there may be a windsock looking thing on the small float valve or torbeck valve depending what it's fitted with, which might have split.

 

[ChrisR]

Wonderfully useful:
http://www.armaturen-versand.de/ersatzteile-dal/details/detail37696.gif

 

[cal_rourke]

Thanks Paul for the unscrewing technique!

Now onto the next problem. The leak is from the top of the assembly pictured here - http://www.manwomanandmyth.com/images/spray.jpg

Do I need to cut water off before proceeding?

As the leak is coming from the underside of what looks like a screw cap, would you recommend an attempt to screw it tight or is this kind of leak telling me to replace something?

Thanks again,
Cal.

 

[Paul Barker]

I'm not sure about the structure involved, it might survive fiddling with but it is as likely to have developed a fracture it's made of plastic. The plastic nuts of float valves and washing machine hoses are prone to crack and fail often a year or two after they were overtightened with a tool.

I would have a go but be ready with a replacement.

Yes I would turn water off while investigating.

It's hard to source such a float valve, but a torbeck valve is readily available at plumbers merchants.