Roca toilet Seat won't stay up

buttons incorrectly marked

allow tank to fill a little more by adjusting fill valve. When there's not enough water flowing from tank the stopper can over-power the water flow and cause the flush to stop by re-sealing.

Hi
yes with an Allen key no problem as the screws are fixed in a plastic plug that wont fall through. See replacement video here
https://www.youtube.com/watch?v=bzIM_aGTRFY

Take apart and see if arms are bent and lube with vasolean

These hinges are completely replaceable and I sell them. Here is a step-by step manual how to do it yourself:
http://roca-parts.eu/roca-softclose-repair/

Is this what you're looking for?
http://www.lunns.net/cisternspares/roca_flushvalve_installation.pdf

mcdevito75 here, Possibly replace the bolt covers as they could be stretched or just leave them off.

Don't know about a roco dama, but most have color coded plugs where the screws go in, you will need to look alittle harder.

Here's what I did. Unscrew them as much as possible. Then I used a bolt cutter and hacksaw to cut away as much of the plastic seat holders as possible. I could then remove most of the seat, and get better access to the screws. I then raised the loose screws enough to cut them with a bolt cutter. Soft screws cut easily. The screw heads are now out. Now, tap down on the screw/anchor and it falls into the bowl. It will stay there. The remaining problem is that you need anchors to secure the new toilet seat. Kohler wants $50. I have a usable but loose seat. Never again-Kohler.
I strongly recommend using a boltcutter. A hacksaw will tear up the bowl.

have the water preasure checked by a certified plumber..