The LiftMaster 41D794 Motor with Positioning Sensor is a genuine OEM replacement motor assembly for select LiftMaster and Chamberlain garage door openers. This integrated unit combines the drive motor with a built-in position/RPM sensor that the opener’s logic board uses to monitor door travel, coordinate soft start/stop, and maintain accurate open/close limits. Installing this assembly restores reliable movement in openers that hesitate, reverse unexpectedly, or lose travel calibration due to a failed motor or feedback sensor. It is intended for compatible residential garage door operators that specify part number 41D794 in their parts list.
Designed to fit the original mounting points and factory wiring, the 41D794 connects to the opener’s control harness and is serviced from within the operator chassis. For safety, disconnect AC power and any battery backup before service, and support the door or pull the manual release to prevent movement. After installation, perform the manufacturer’s setup to re-learn travel limits and force, and verify proper safety reversal operation per UL 325 guidelines. Compatibility is model-specific; confirm your opener’s model and parts diagram or the label on the existing motor assembly for the exact part number 41D794 before ordering. This OEM motor assembly is suited to residential belt- or chain-drive units that call out this part and is not a universal substitute for other motors or for wall-mount/jackshaft operators.