With the wheels off the 8N I disassembled further, removing the brake drums, shoes and springs. On the left side the bottom shoe was oil-soaked and I assumed a leaking seal.
Referring to the PDF in "How Tos" I removed the circlips, loosened the axle nuts (had to use a cheater on the right side; left side probably was not tightened to 450 lb/ft.)
Bought an 8-inch 3-jaw puller and after quite a bit of torque and some banging with a hammer the left hub came loose. From there I was able to strip down to the bearing.
But the right side is more stubborn: I torqued until I couldn't turn the screw any more with an 18" breaker bar and socket. I banged on the hub to no effect. I left it under tension overnight and returned in the morning. I tried a large pry-bar, also tried pounding a wedge behind the hub. No movement.
The "how to" mentioned heating with a torch; I tried that, along with wedge and lever. Nothing.
By now I have fried whatever seal was in there, so the hub has to come off. But how?
Thanks for your replies.