I have a front sealed bearing hub similar to those you have. Attached is an old ad for your hubs that has a diagram of the inside setup. Disassemble is fairly easy; just unscrew the end nut and preload nuts like you would a loose ball hub, using cone wrenches and remove the axle (you should only have to remove the nuts on one side and slide the axle out. Once this is done carefully pry out the metal dust covers with a small screwdriver. These bearings are usually pressed in. The best tool I have found for this are these
Sealed Bearing & Hub Cup Remover
http://www.loosescrews.com/index.cgi...d=992732126840 (buy a couple as they tend to get bent up, plus this website is going out of business. They way they work is simple. Squeeze the metal nubs together and insert them through the bearing until the lips on the nubs are behind the bearing. Next turn the hub over and you will see the tool has created a surface to drive out the bearing. Put the axle back in the hub until one end is against tool and and pound out the bearing; if you use something other than the axle it will probably be too narrow and the tool may slip out and usually the bearing will come out easy enough that no harm will come to the axle threads. If the bearing was not loose but binding as it turned it may serviceable, if the bearing was loose then it will need to be replaced. My theory here is if you are going to go through the trouble of
pounding out the bearings you might as well replace them. The size is probably 6001 ("RS" for Rubber Sealed); the size is 12mm x 28mm x 8mm. These bearings are available pretty much everywhere; here is your size at the the Loose screws site
http://www.thethirdhand.com/index.cg...d=155511326832. I like to buy Phil Wood bearings because I know what I'm getting
http://www.jensonusa.com/Sealed-Cart...tridge-Bearing but there are plenty to choose from.
