What precaution should be taken during cold weather operation to avoid damage to frozen sheaves?

During cold weather operations, it is important to prevent damage to frozen sheaves, which can lead to operational failures or safety hazards. Raising the blocks and boom before lowering them is the correct precaution because it helps to prevent the accumulation of ice or snow on the sheaves, cables, or rigging that could potentially freeze and create operational issues.

By lifting the load and boom initially, you allow for any frozen components to be cleared before they come into contact with the ground or other snow and ice-covered surfaces, thereby reducing the risk of further freezing or damage. This practice also helps to ensure smoother operation when the crane is lowered, as it prevents the sheaves from becoming stuck or binding.

In cold conditions, conducting a thorough check of all equipment is crucial, but the specific action of raising before lowering is essential to keeping the crane's moving parts free from ice, which can significantly impair performance and increase the likelihood of accidents.