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I use a brass punch and drive the bearing out, forcing the seal out also. Replace the seal and clean/inspect/repack the bearing. The new seal gets "pressed" in(hammer and a block of wood will work fine), or a large socket. Only press it in by its outer edge.
Found this with a simple google search for the part number(J-34616 ) you posted in this thread. There were dozens of other results that looked promising too.
http://www.steelsoldiers.com/cucv/19313-pics-my-rig-new-here-part-number-question.html