Which three components make up the scarifier?

The scarifier is an essential attachment used on road graders for tasks such as breaking up hard surfaces or preparing a surface for grading. It is primarily composed of three components: a shank, tooth, and retaining pin.

The shank is the main body of the scarifier that holds and supports the other components. It ensures that the unit remains stable while cutting through materials. The tooth is attached to the shank and is the part that actually makes contact with the ground. It is designed to penetrate the surface effectively, allowing for the desired breaking up of material. Lastly, the retaining pin secures the tooth to the shank, preventing it from dislodging during operation and ensuring that the scarifier functions efficiently.

The other options listed do not represent the components of a scarifier. The second option includes parts associated with machine control rather than material processing. The third option lists components related to the mobility of vehicles, while the last option describes elements of the hydraulic system, none of which are relevant to the scarifier's function. Thus, the structure and design of the scarifier, specifically its shank, tooth, and retaining pin, are crucial for its operation in road maintenance tasks.