Truck crane is generally made up of truck chassis, crane accessories, cargo box, lifter and crane.The carriage crane is a kind of equipment which can realize the lifting, rotating and lifting of goods through the hydraulic lifting and stretching system.Truck crane maintenance instructions as the lorry-mounted crane is special vehicles, the operator should accept the manufacturer's guidance, training, performance of the vehicle structure, know enough about, and from the manufacturer to get a lorry-mounted crane operation and maintenance experience before operating the machine.Manufacturers provide lorry-mounted crane product specifications in operation and maintenance, is essential information of the lorry-mounted crane operators operating equipment, before operating the machine, be sure to read the use of the lorry-mounted crane maintenance manual, operate according to the requirement of the specification and maintenance lorry-mounted crane.Operators should always check the position and quality of coolant, lubricating oil, brake fluid, hydraulic oil and fuel oil (water), and check the sealing of the whole vehicle.The maintenance requirements of the crane during the grinding period can be summarized as: reducing load, strengthening lubrication, strengthening training and paying attention to inspection.As long as the operator attaches importance to and in accordance with the requirements of lorry crane manufacturer period for maintenance and maintenance, can reduce the accessory crane early failure, prolong service life, improve the working efficiency, let lorry crane to bring you the biggest benefit.At the same time, the lubrication of each lubrication point of the truck crane should be strengthened, it is recommended to add grease to the lubricating point in each shift during the grinding period, except for special requirements.Therefore, it is easy to cause the wear and tear of parts (especially the mating surface) and the wear speed is fast during the grinding period of the truck crane.At this time, if the overload operation, it may lead to the damage of parts, causing early failure of the truck crane.1) : understand the size of lifting goods, find the distance between the position of cargo center and the center of crane pillar, and check the lifting capacity parameters of crane according to the distance.2) : the lifting capacity (moment) of the crane is fixed, and the working radius of the crane is larger.The lighter the cargo, the smaller the working radius, the heavier the cargo.(the working radius refers to the horizontal distance from the torque center to the hook.)- 3) : considering the hoisting size of the crane and the bearing capacity of the chassis, the larger the girder is, the better. The larger the crane is and the smaller the chassis, the deformation and fracture of the girder will be caused.The chassis is small, the power of the engine is small, which affects the lifting capacity of the crane.Therefore, when we consider the 230mm girder, we choose a crane with less than 3 tons.When considering a 250mm girder, consider a crane below 6 tons.280mm girder can choose a crane under 8 tons.For example, the rear eight wheels and the first four chassis can be considered under 10 tons of cranes.