The LiftMaster K10-10371 Straight Door Arm is an OEM replacement component for LiftMaster commercial trolley-style door operators. This straight arm forms the rigid link between the opener’s moving trolley and the door-side arm (curved arm) on sectional overhead doors, restoring proper travel geometry and smooth opening/closing when the original arm is bent, worn, or missing. It is typically used on commercial and industrial applications where a trolley rail operator moves a sectional door, such as warehouses, service bays, and light industrial facilities. As a genuine LiftMaster part, K10-10371 is designed to match the operator’s linkage requirements and maintain reliable performance within the door system.
Use this replacement straight door arm with a compatible LiftMaster trolley operator and the matching curved door arm specified in the operator’s parts diagram. Installation should be performed by a qualified door professional: disconnect power, secure the door, attach the arm to the trolley and door bracket per the manufacturer’s instructions, and recheck open/close travel limits and force settings to comply with UL 325 and local safety standards. Compatibility varies by operator model, so confirm that part number K10-10371 appears in your opener’s manual or parts list for T-rail trolley configurations before ordering. This makes it a dependable choice for maintenance and repair of LiftMaster commercial trolley operators where a straight door arm replacement is required.