How should an operator secure the excavator after parking?

To secure an excavator after parking, the correct approach is to activate the parking brake or leave it in the park position. This is crucial for safety, as it prevents the excavator from rolling or moving unintentionally. Properly engaging the parking brake secures the machine, ensuring stability and safety for both the operator and any personnel nearby.

The parking brake acts as a primary safety feature, allowing the operator to have peace of mind that the machine will remain stationary until needed again. Additionally, leaving the machine in a designated park position contributes to this security, ensuring that it is not only immobilized but also in a safe, designated area when it's not in operation.

The other options do not sufficiently guarantee the machine's safety. For instance, leaving the excavator in neutral does not prevent it from rolling, especially on inclined surfaces. Turning off all lights, while it might save battery power, does not contribute to the stability of the machine. Merely ensuring the excavator is on flat ground does not fully address potential movement risks, particularly if the machine is not secured. Thus, the most comprehensive and effective method for securing the excavator is to engage the parking brake or leave it in the park position.