[mikes2]

The 3 bolts attach to the U shaped item which is a balance weight. They don't hold the flange.

How do you propose to remove the flange ? Looks like it's an interference fit with no central bolt to hold it in place.

I think a puller would work or you could use long bolts and a support behind it to release it.

You've then got the challenge of extracting the seal. I'm not seeing any dimensions for the seal.