Crane use and maintenance: Running characteristic period. Leakage occurs. Due to mechanical loosening effects of vibration and heat of the machine, the sealing surface of the machine and pipe fittings, etc. used 120 tons crane much money, there will be leakage; part casting, machining and other defects 120 tons crane company in the assembly debugging difficult to find 120 tons crane much money, but because of vibration during operation, shock effect, this flaw is exposed, the performance of leakage (infiltration) oil (water). Therefore 120 tons crane, prone to leakage run-in period. Crane use and maintenance: run-in period of use and maintenance. Manufacturers to provide product maintenance manual, the operator operates the equipment essential information before operating the machine, be sure to read the maintenance manual, according to the requirements of the specification operation and maintenance.