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Rear hub questions? identify/rebuild

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PD Monkey

Look Ma, No Hands!
Hello, I recently bought a 62 Fleet. It is my first older bike so hopefully these questions aren't too dumb.

It has a single speed coaster brake. The hub only says Germany on it. It spins pretty good but there is a little crunching in there. A few questions.

What brand hub is it?
I have never taken on apart, but I can't imagine it is too hard. Any tips??
There is a little side to side play on the hub. I noticed the axle bolt has a squared end. I thought I recalled reading somewhere that turning the axle bolt does "something".
There is probably around 1/3 of a rotation of freeplay to hit the brakes/start pedaling.
There is a nipple on the hub, is this to add oil/lubricate?
The brakes are pretty weak. I was hoping if I cleaned up the hub, I could clean/rough up the brake surfaces?

Side question:
The crank nut looks a little different from anything I have seen. I am assuming it comes apart like a traditional set of Schwinn cranks? They are smooth but I might take them apart to clean up some rust.

Thanks in advance!!

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Rear hub with oil port perhaps F&S Fichtel & Sachs. Common adjustment for excess lateral play is tighten cone nut. Damaged bearing balls make crunch sound.
 
Your hub shell looks like this one. Is the shell marked Schwinn Approved?

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Thank you @GTs58 , that looks like the one I have. I'll have to google that service manual or check youtube. It does look pretty simple. Hopefully the bearings are in one piece. I would think they are is it rides good, just a little crunchy like it might have sand in it. It has been a San Diego/Santa Cruz bike all it's life.
 
I took it apart and cleaned it up. The cone has some minor pitting, not bad for 60 years old. The brakes were pretty glazed. I cleaned and lightly roughed them up. The grooved on the inside lip are pretty caked. I tried to clean to grooves but 60 years of crust won. It wasn't budging. The brakes work....just OK before. Hopefully they will be a little better now. Where would I even look for new brake pads, if I wanted to replace them?

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