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Bard part number 8602-020 is an OEM 24-volt synchronous/reluctance motor assembly supplied with a crank arm, commonly used as an actuator-style motor for moving linkages such as outdoor air or economizer dampers in Bard wall-mounted HVAC equipment. Replacing a weak or stalled motor helps restore proper damper positioning so the unit can maintain correct ventilation and economizer operation, reduce nuisance faults, and keep airflow control responsive. This 8602-020 unit motor (often referenced alongside motor model M8405A1006) is intended for direct-fit replacement on compatible Bard assemblies, so confirm the unit model and existing linkage style before ordering to ensure proper match and smooth travel.