Which maintenance task should be performed before testing belt tension?

Turning off the compressor and disconnecting power is essential before testing belt tension to ensure safety. Working with machinery that is powered on presents significant risks, including the potential for accidental activation, which could lead to injury. Disconnecting power eliminates these hazards, creating a safer environment to perform maintenance tasks.

Additionally, when testing belt tension, it’s crucial to have the machine in a stable and controlled state. Powering down the compressor allows for a proper assessment of the belt’s tension without the interference of running machinery. This practice aligns with standard safety protocols in maintenance procedures, reinforcing the importance of safety and caution in handling equipment.

The other options tend to ignore necessary safety precautions or are not relevant to the immediate task of checking belt tension, which emphasizes the importance of creating a safe working environment first.