What should be done when performing maintenance on a backhoe with raised loader arms?

When performing maintenance on a backhoe with raised loader arms, it is crucial to ensure the service lock is installed. The service lock acts as a safety mechanism that secures the loader arms in their elevated position, preventing any accidental lowering while maintenance is being carried out. This ensures the safety of personnel working around the equipment and mitigates the risk of injury or equipment damage.

In the absence of the service lock, there is a significant risk that the loader arms could unexpectedly fall or shift, posing a serious hazard. The other options do not provide the necessary safety measures required during maintenance and could lead to unsafe working conditions. By prioritizing the installation of the service lock, operators can carry out maintenance tasks with enhanced safety and peace of mind.