Crane maintenance: the rope wrapped around the rope directly affect the life or not more than 2 °, maintenance has a great influence on rope service life. Select the appropriate type of wire rope and pulley material, arranging inspection by a professional staff, maintenance and use, to ensure that the center line and reel the rope structure, pulley axis angle midpoint generated α≤1 ° 30 '. Crane Maintenance: The driver is responsible for the routine maintenance work project, used 250 tons crane, mainly as clean 250-ton crane, lubricate transmission parts, adjusting and fixing work. By running the test the reliability of sensitive safety devices, monitoring the operation of any abnormal sounds. Crane crane using the unit should regularly be checked using mechanical maintenance.