Crane main performance parameters indicators: The main parameters characterizing parameter crane cranes are mainly technical performance indicators, it is based on a crane design, but also the heavy machine safety technical requirements of an important basis. Starting weight: Starting weight refers to the weight of the mass lifting 20 tons crane price, kg or t. It can be divided into nominal weight, maximum weight, from the total weight, effective from the weight and so on. Crane use and maintenance: lifting equipment maintenance and maintenance by hand. After equipment delivery, routine maintenance or use by the device driver operating unit is responsible for full-time staff, 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.