Crane safety devices: from the weight indicator. From the weight indicator is set in the basic arm together side (ie, the right side of the cab) is used 35 tons crane operator sitting in the control room will be able to be clearly observed, it can accurately indicate the elevation and the corresponding boom Crane conditions allowed the rated capacity. Crane Note: Each crane nominal weight must hang signs in conspicuous places. Work, was not allowed to transport people or hook on the bridge. No operating permits and drink are not allowed to drive a crane. Operation must concentrate, not allowed to talk, smoke or do has nothing to do. To clean the car; allowed misplacing equipment, tools, flammable and explosive materials and hazardous materials.