What is one of the primary safety checks before operating a backhoe loader?

One of the primary safety checks before operating a backhoe loader is checking fluid levels and overall machine functionality. This step is crucial because proper fluid levels—such as oil, coolant, and hydraulic fluid—ensure that the machine operates effectively and does not overheat or suffer from mechanical failure during operation. Additionally, assessing the overall functionality includes inspecting essential components such as the brakes, steering, and hydraulic systems, which are vital for safe operation. Without these checks, there is an increased risk of malfunction, which could lead to accidents, injuries, or damage to the machine.

While other options suggest elements of safety or efficiency, they do not directly address the immediate operational integrity of the backhoe loader. For instance, speed limit signs contribute to safety awareness in the work area, but they do not ensure that the machine itself is in working order. Keeping the machine clean is beneficial for visibility and maintaining its condition over time, but it does not prevent operational issues that could arise if the fluid levels and functionality are not checked. Having a co-worker supervise can enhance safety but is not directly related to the machinery's operational checks necessary for safe usage.