What are the three steering modes of the grader?

The three steering modes of a grader are essential for effective maneuverability and control on various terrains. The modes mentioned in the correct answer—Crab, Straight frame, and Articulation—each serve a specific purpose:

1. Crab Steering allows the grader to move diagonally while maintaining the alignment of the front and rear wheels. This mode is particularly useful when grading ditches or working near obstacles, as it provides enhanced flexibility and precision in positioning.

2. Straight Frame Steering provides straightforward movement in a linear direction. This mode is useful for long, straight grading tasks where maximum stability and control are required.

3. Articulation Steering operates by pivoting the grader at the center point, which allows for tighter turns and improved maneuverability in confined spaces. This capability is crucial in complex grading situations or when navigating around obstacles.

The inclusion of these three modes enables operators to customize their approach based on the specific requirements of the job, making the grader a versatile tool in road construction and maintenance.