Part 2 Remove and replace seals. Clean the shafts so you don't damage the seals. Drill a couple of small holes, carefully so you don't damage the bearing, into the face of the seal. Screw a self-tapping screw a few threads into the seal and use pliers, screwdrivers, pry bars as appropriate to pull the old seal out. Clean things up and start the new seal in. Use a socket, pipe coupling, or what have you that fits the outer ring of the seal and tap it in. Notice that the output shaft has a shield washer and snap ring that have to be removed to access the seal.
Reassemble in reverse order. Don't forget the oil!
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