You have to remove the axles in order to get to the hub nut. Luckily the axles just slide out with no retaining clip in the differential. Once the axles are out you can get to the hub nut, remove it and the outer wheel bearing and the drum/hub slides right off (if the drum is very worn you may need to do a bit of prying. Its very similar to doing front drums/brakes on an older car. Then you can get to the brakes. But if you can't get the wheel off the drum the whole assembly is very heavy.