JCB 520-50 replacing brakes

I have a 2005 JCB 520 and the brakes are squealing. I ordered the brakes, but I have never done these before. I talked to the local supplier and they tell me there is nothing inside the hub but the brakes. Local companies that repair/rent these say they just order new hubs. I finally found a print with the planetary gear setup inside the hub so I see what I'm getting into. I'm looking for any general information about adjusting the brakes once the replace them.

Thank you

JCB 520-50 replacing brakes