The LiftMaster K07-17438 Spider Coupling is an OEM replacement component used in select LiftMaster commercial door operators to connect the motor shaft to the gearbox or drive assembly. This flexible jaw-style coupling uses a spider insert between two hubs to transmit torque while absorbing shock, reducing vibration, and compensating for minor shaft misalignment. By cushioning starts and stops, it helps protect drive components and supports smoother, quieter operation in demanding commercial and industrial door applications.
Use the K07-17438 when replacing a worn or damaged coupling in compatible LiftMaster trolley, jackshaft, or hoist operators as specified by the model’s parts diagram. Installation typically involves disconnecting power and following lockout/tagout procedures, aligning the mating hubs, inserting the spider between the jaws, and securing the hubs per the operator’s service manual with correct alignment and fastener torque. After installation, verify free rotation, proper alignment, and absence of rubbing. Regular inspection for wear and deterioration is recommended as part of preventative maintenance. Always confirm compatibility with your exact LiftMaster model and logic board series using the official parts list or service documentation before ordering.