Which component of a road grader is primarily responsible for its steering?

The hydraulic system is primarily responsible for the steering of a road grader. This system allows for precise control over the movement and positioning of the grader's articulated frame, which is essential for maneuverability. The hydraulic system manages the operation of hydraulic cylinders that help pivot the frame and control the angle of the front and rear axles.

By using hydraulics, operators can achieve significant flexibility and responsiveness in steering, allowing for accurate navigation around corners and along the edges of road surfaces. This is especially important in grading work, where precision is crucial for creating a smooth and even surface.

While the other components play vital roles in the grader's operation, such as providing power (the engine), supporting the vehicle's contact with the road (the tires), and performing the cutting or leveling of the surface (the blade), they do not directly influence the steering mechanism as the hydraulic system does.