In what order should the lattice boom pin assembly be installed?

The correct installation order of the lattice boom pin assembly is essential for the stability and safety of crane operations. By installing the top pins first, you establish a secure connection at the upper part of the assembly, ensuring that the boom is properly aligned and secured at its highest points. This helps in minimizing any potential misalignment that could occur if the lower pins were installed first.

Installing the top pins initially allows for gravity to assist in holding the boom in place while the lower pins are put in. After the top pins are secured, the bottom pins can be installed, completing the primary connection of the boom structure. Following this, the pendant lines can be attached to provide additional support and stabilization to the entire assembly.

This sequence is crucial because it ensures that the structure is both safe and stable throughout the installation process. Starting with the lower parts, such as the bottom pins or pendant lines, could lead to potential issues with the boom's alignment, making the installation less effective and safe.