Which key component of a road grader is used to adjust the blade angle?

The hydraulic system is the key component that enables the adjustment of the blade angle on a road grader. This system utilizes hydraulic fluid to power various movements, including raising, lowering, and tilting the grader's blade for effective grading of the road surface. Through the manipulation of hydraulic controls, operators can precisely adjust the angle of the blade to achieve optimal cutting, leveling, and grading performance.

While the engine provides the necessary power for operation and the transmission allows for movement and speed control of the grader, neither directly influences the blade angle adjustment. The tire pressure system is related to the vehicle's stability and handling but does not affect the blade's position or angle. Therefore, the hydraulic system is essential for making those crucial adjustments that impact the grading process.