The LiftMaster K12-10891 is a genuine OEM ball bearing engineered to support rotating shafts within LiftMaster operator assemblies, helping maintain smooth, low-friction motion and precise shaft alignment. Identified by its 1-inch inner diameter, this replacement part restores proper operation in systems that specify K12-10891 in their parts diagram, addressing symptoms such as excess noise, vibration, or drag from a worn bearing. It is suitable for drive shafts, gear trains, and pulley assemblies found in select LiftMaster operator equipment.
Installation should follow the service procedures in the specific operator’s manual: disconnect power, secure the mechanism, remove any retaining hardware, and press or slip the bearing into the housing or onto the shaft as designed, then verify free rotation and alignment before re-energizing the system. No programming is required for this mechanical component. For compatibility, always match the part number K12-10891 to the model’s official parts list or service bulletin.