All blocks must be regularly inspected to monitor its condition. The frequency of inspection depends upon frequency and period of block use as well as environmental conditions. When inspecting blocks for wear, check headfittings for deformation, cuts, sharp edges and any damage which may produce additional stress conditions. Check for excessive wear in pins, side plates, rope grooves, bushes and bearings. Check security of bolts, nuts and any other locking method and ensure that during continuous usage cannot vibrate loose. Any crack or deformation of a block is sufficient to withdraw the equipment from service.   The frequency of lubrication depends on product use and environmental conditions. Upon request Blue Line will provide both lubrication type and frequency. Also available we have instructions on disassembling and assembling of blocks and sheaves. Welding of or to load supporting parts or products can be hazardous. Knowledge of materials, heat-treatment and welding procedures is necessary for proper welding. The Blue Line should be consulted for information.