The Genie 27090A.S Drive Worm Gear is a genuine OEM replacement component engineered for select Genie garage door openers. Installed on the motor shaft inside the opener head, this worm gear engages the reduction gear set to drive the sprocket assembly that moves the chain or belt, restoring smooth lifting and lowering performance. It is ideal for repairing symptoms such as grinding, slipping, or a motor that runs while the door or trolley fails to move. Because it is an original Genie part, it maintains designed fit and function for compatible residential openers and certain light-duty applications that specify 27090A.S in their parts diagrams.
Compatibility should always be confirmed by checking the opener’s model-specific parts list or service manual; this drive worm gear is typically used alongside the Genie drive gear/sprocket assembly (for example, assemblies identified by part numbers such as 27096A.S on applicable units). Installation involves disassembling the opener head to access the gearcase, removing the worn worm gear, and reinstalling the new component with appropriate opener-safe lubricant where specified by Genie. For safety, disconnect power, place the door in the down position, disengage the opener from the door, and follow all manufacturer procedures; after reassembly, verify travel limits and force settings and reprogram if required. This OEM Genie drive worm gear is a direct replacement part for select chain- or belt-drive Genie openers that call out 27090A.S, providing a factory-correct repair without aftermarket guesswork.