Garage door replace gear box

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How to replace sears liftmaster garage door opener. Ge motor 5kcp39ggf212 s 1 phase replace components, 40gz7090r 24v electric worm gear motor 45rpm garage door. Dc gear motor garage door raplacement 24v electric right. Buy liftmaster 41c4470 gear and sprocket assembly online, genie garage door opener gear housing cover, part # 20449rs.