Not hard at all. Remove the three small bolts holding the retainer on (5mm allen) Sometimes the seal can be a bit of a bitch to get out without scarring the housing but usually not too bad.Take your time!
Make sure the housing is clean before you install the new seal.If the seal isn't coated on the outside, put a coat of red Locktite on it . Also,make sure it goes in with the "lip" facing the correct way. Also a good idea to put a small amount of sealer on the housing where it meets the case.
Ron
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