Crane use and maintenance: lifting equipment maintenance and maintenance by hand. After the device delivered 55 tons Tadano crane, routine maintenance by device drivers or operating unit is responsible for full-time staff used 55 tons crane, installation maintenance units for routine maintenance obligation to supervise and inspect the contents of bears. The main content of routine maintenance department summarized as "cross Job Law": clean, tighten, lubrication and adjustments, corrosion. Crane means within a certain range vertical lifting and carrying heavy loads of horizontal multi-action lifting machinery. Also known as cable car. It belongs to material handling machinery. Working characteristics of the crane is doing intermittent movement, that in a work cycle Reclaimer, transport, unloading and other movements of the respective agencies are working alternately, development and use of cranes on the market more widely.