Dismantle the grinding mechanism to replace the distributor wheel?

Hello,

how can the bevel gear in the grinder be removed so that the distributor wheel can be replaced?

I have already blocked the bevel gear with an Englishman and then tried to loosen the nut on the underside of the gear, but it turns freely without the screw moving in the bevel gear.

There are instructions for each grinder. And they are all different. So we need the make and model of the automatic coffee machine...

It's a Krups EA6990.

Doesn't anybody have a tip for me?

I was looking for help to another problem when saw your question. Posting this in case still a problem for you:

I grabbed the (conical) grinding wheel with mid size pipe pliers with soft jaws to keep the grinder shart put and then opened the nut. Pliers slipped a couple of times and I was about to start designing a 3d printed part to grab the wheel, but then managed with the pliers...

I can fix the grinder / conical grinding wheel, but in my case the nut rotates freely, i.e. I can turn the nut without it coming loose.