Sears Craftsman 1/2 Hp Garage Door Opener Gear Kit Instruction manuals for Liftmaster. OPERATORS LiftMaster LJ8950W Low-cal-Duty Commercial Jackshaft Operator w/Built-In Wi-Fi for Rolling Doors LiftMaster LJ8900W Light-Duty Commercial Jackshaft Operator westward/Built-In Wi-Fi for Sectional Doors LiftMaster Elite Series 8500W Wall-Mount Garage Door Opener westward/Built-In Wi-Fi and Battery Fill-in Liftmaster 8500 Wall Mountain Garage Door Opener