What should not be stored on a crane to prevent fire hazards?

Storing loose cold weather starting fluid containers on a crane poses significant fire hazards due to the highly flammable nature of the fluid. These containers typically contain chemicals that can easily ignite, especially in the presence of heat sources, sparks, or open flames commonly found on job sites. Inadequate storage of such volatile materials increases the risk of a fire, compromising safety for operators and those working nearby.

The other options, while potentially problematic if not handled correctly, are less likely to create immediate fire hazards. Heavy lifting materials, construction tools, and operational manuals do not inherently carry the same level of fire risk as flammable liquids. Therefore, ensuring that only safe materials are stored on cranes is essential to maintaining a safe working environment.