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. 100 tons crane much money, there will be leakage; part casting, machining and other defects 100 tons crane company, in the assembly debugging difficult found, but due to vibration during operation, shock effect, this flaw is exposed, the performance of leakage (infiltration) oil (water). Therefore, prone to leakage run-in period. Crane main performance parameters indicators: speed. Crane speed: carts running speed is the crane on a level surface or orbiting speed with rated load, in units of m / min. Car speed: the speed of the trolley refers to a stable state of motion, the car on a level track speed load ratings of units of m / min.