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There's 2 bearing and 2 races. The first bearing will fall out after the castellated nut and washer are removed and the drum is pulled off. In side the drum is a rubber seal, like a cam seal. Whip this off and you'll get another bearing. Either side of the drum in the holes the bearings were in is a smooth race. You can see notches either side of them to get a punch down and knock them out a side at a time. Refit the same way.
When refitting the hub nut I do it up tight with a regular 3/8" ratchet and loosen right off a few times to settle the bearings, then nip it up JUST passed hand tight.
There should just about be some very slight play in the wheel. If there is none at all the bearing is too tight and you run the risk of seizing it, usually at high speeds and the entire stub axle being ripped from the beam, with lots of scary noises. It's far better to be a bit too loose than too tight, like with spark plugs.
 
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