From Champion Trailers:
Whenever you install new hubs or new bearings and races into an old hub, you should pre-load the bearings. Pre-loading the bearings assures that the races in the hubs are in place against their machined stop points and keeps the hub from wobbling after a few miles.
To pre-load the bearings, install the spindle washer and spindle nut onto the spindle with the hub and bearings in place.
Tighten the spindle nut finger tight (until snug) and then with channel-lock pliers or a crescent wrench, tighten the spindle nut another 1/4 turn or about 15 to 20 ft pounds of torque.
Now turn the hub ten revolutions. This will fully seat the races.
Now loosen the spindle nut very loose, then re-snug to finger tight, and engage the nut retaining device (some reverse lubricating spindles use a tab washer for the retaining device).
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