The LiftMaster 41D4509 Replacement Motor & Bracket Assembly is a genuine OEM component designed to restore dependable operation to select LiftMaster residential garage door openers. This factory-assembled unit includes the drive motor mounted to its dedicated bracket for a direct, like-for-like swap, helping resolve symptoms such as a seized or noisy motor, stalling during travel, or inconsistent operation. As an original LiftMaster replacement part, it is intended for specific models that explicitly list 41D4509 in their parts diagram or service documentation, making it an ideal choice for owners and technicians seeking a precise, compatible motor assembly rather than a universal substitute.
For compatibility, match the part number on your opener’s parts list or service label before ordering; this motor assembly is not interchangeable with different part numbers. Installation should be performed with power disconnected and the opener supported to prevent rail misalignment. After mounting and reconnecting wiring as originally routed, re-adjust travel limits and force settings per the opener’s manual and verify the safety reversing system as required by UL 325 (including a 2x4 obstruction test). If your opener incorporates a separate start capacitor or specific harness connectors, transfer them as directed by the manufacturer. Use only on operators configured for the same rated input and control system as originally equipped, and consult LiftMaster technical literature or the opener’s manual for any model-specific programming steps.