This drive gear replacement kit 41A2817 is for all Liftmaster, Sears, Chamberlain chain and belt drive openers manufactured from 1984 to the present. Also used for Wayne Dalton opener models 100 - 320. This is the manufacturer original equipment replacement part for the following garage door openers: Lift-Master, Sears Craftsman, Chamberlain, Master Mechanic, Garage Master. Kit Part No: 41A2817 Main drive gear Worm gear Replacement bushing fittings, & pins Lubricant All 1/3 Hp, 1/2 Hp, 3/4 Hp Chain and belt drive garage door openers manufactured from 1984 to the present for these manufacturers: Wayne Dalton models 100-320
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