Hydraulic oil heat dissipation system of a concrete mixer truck is generally composed of four parts: the heat exchanger, the motor, the temperature sensor and the control box, among which the heat exchanger is the most likely to have failures. Therefore, the first thing to do should be checking it in case of problems in the dissipation system.

　　A heat exchanger functions like a water tank. Similar to the engine, a concrete mixer truck is cooled down by a hydraulic oil radiator. The motor-driven fan on the heat exchanger (also known as the radiator tank) carries out forced heat dissipation to keep the hydraulic oil in normal working range. The mechanical pointer can detect the negative pressure in the pipeline. If the reading proves that the hydraulic oil filter may be blocked, just pull out the rubber plug and the pointer will return to zero. If the reading still appears, the hydraulic oil filter core needs to be replaced. The motor is the most critical part of the whole heat dissipation system. It drives the fan which takes away the heat of hydraulic oil. The heat dissipation effect is directly related to the speed of the motor and the smooth state of its operation. Powered directly by an electronic control box connected to a vehicle battery, the motor cools down the hydraulic oil by taking away its heat. The temperature sensor installed on the oil intake pipe of the heat exchanger is used to detect the temperature of the hydraulic oil entering the heat exchanger. It is the second failure point to be eliminated after the insurance failure has been eliminated. The control box is the brain of the whole heat dissipation system, similar to the ECU of the vehicle. It keeps temperature of the hydraulic oil under a reasonable control. Analyzing the data transmitted by the temperature sensor, it will connect the circuit of the heat dissipation motor once the hydraulic oil exceeds the predetermined temperature value. The motor then runs and take away extra heat in the hydraulic oil. It is equipped with a safety device to protect the entire circuit so that the control box will not be damaged in normal cases.

　　To conclude, the most economical and time-saving order of troubleshooting should be in the following order after the heat dissipation system fails: Inspection Insurance-Change Temperature Sensor-Change Motor-Change Control Box. Learning working principles of concrete mixer trucks help drivers to solve common problems, for no trucks bring you profit without careful maintenance.