What instruction is emphasized on safety stickers regarding the operation manual for stackers?

The instruction to always refer to the operation manual is emphasized on safety stickers because it promotes safe and effective operation of the stacker. The operation manual is a comprehensive document that provides detailed information on how to operate the equipment safely, including guidelines for proper use, maintenance, and troubleshooting.

By following the instructions in the operation manual, operators can ensure they are aware of the specific operational limits and safety features of the stacker. This knowledge significantly reduces the risk of accidents and injuries on the job site. Operators who reference the manual often can also stay informed about any updates or specific safety protocols that are critical for the safe operation of the equipment they are using.

In contrast, choices suggesting that the operation manual should not be referred to or is optional undermine the importance of following procedural guidelines, which can lead to unsafe practices and increase the likelihood of accidents. The emphasis on always consulting the manual serves as a reminder of the responsibility operators have to prioritize safety and ensure they are using the equipment correctly.