What should be done before removing any pins from a crane's boom?

Before removing any pins from a crane's boom, it is essential to ensure that the boom is properly supported. This is critical because removing pins while the boom is not adequately supported can lead to catastrophic failures, potentially causing the boom to collapse or fall unexpectedly. Proper support ensures that the boom is stable and that there is no risk of uncontrolled movement when the pins are removed. This is a safety-critical step that protects not only the equipment but also the operators and bystanders.

In contrast, if the boom is under strain, it is especially dangerous to remove pins as it may exacerbate the stress on the structure and lead to failure. While consulting another operator can be good practice for safety, it does not replace the need for ensuring physical support. Conducting a speed test does not relate directly to the task of pin removal and does not address the immediate safety concerns involved in supporting the boom correctly.