Crane use and maintenance: lifting equipment to regular professional examinations. Regular inspection and maintenance of equipment used in the process: in the time in a number of machinery and equipment maintenance and repair, to clean, lubricate, adjust, disintegration, maintenance-centric content. Usually by the maintenance personnel and operations personnel work together to complete. Crane safety devices: safety devices luffing jib. When the mishap occurred Tadano 65 tons crane, jib luffing cylinder loop or high-pressure hose or hose burst off 65-ton crane company, the hydraulic circuit balancing valves on work, work from the lock cylinder lower chamber oil, so that the arm will not fall, so as to ensure the safety of operations.