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In order to place the wheel bearing the steering knuckle assembly needs to be removed then the hub pressed out of the bearing then the bearing gets pressed out of the knuckle after the snap ring is removed.
Yes on the hub. You can use a hammer and steel bar the same diameter to drive the hub out then take some where that has a press to press the bearing out. If you are reusing the hub you need to use a cutting wheel to cut the inner race off the hub before reinstalling.