Caterpillar 509-9704 Governor Motor Assembly

The 509-9704 Governor Motor is an electromechanical stepper motor actuator designed to regulate engine speed by controlling the fuel injection pump rack or electronic throttle valve. It operates as a critical component within the engine governing system for Caterpillar C4.4 (Perkins 3054C) diesel engines. This assembly interfaces directly with the engine ECM to maintain precise speed control under varying load conditions. It is engineered for the high vibration and thermal environments typical of hydraulic excavator applications. The unit supersedes previous part numbers 247-5207, 247-5206, and 227-7667. Cross-reference interchange includes 386-3435 and 483-7809.