What should be checked before starting a road grader?

Prior to starting a road grader, it is crucial to check the hydraulic fluid levels because the hydraulic system is essential for the operation of the grader. The hydraulic fluid is responsible for the proper functioning of various components, including the blade adjustment and steering. If the hydraulic fluid levels are too low, it can lead to inadequate power to lift and lower the grader's blade, resulting in reduced functionality or even damage to the hydraulic system. This check is fundamental to ensure that the equipment is safe and operational before use.

In contrast, while the air conditioning system and the operator's seat are important for comfort and safety, they do not affect the operational readiness of the grader as directly as hydraulic fluid levels do. The music system, while a nice feature for entertainment, is not relevant to the performance or safety of the grader and thus does not warrant a check before operation.