The cooling system of the crane is generally simple and consists of cooling fan, radiator, thermostat and other components. The cooling fan is usually directly driven by the engine, and the fan speed is consistent with the engine speed. The control of cooling water temperature mainly depends on the thermostat. This is quite different from the electronic fan controlled by the temperature sensor and the radiator with adjustable shutter used in ordinary cars.
The structure has convenient maintenance and low cost. The disadvantage is that the cooling water temperature control is not sensitive. The engine water temperature is mainly related to whether the thermostat works normally, whether the water pump can establish sufficient pressure, and whether the cooling fan can reach the standard speed. In order to judge the failure of the cooling system, we should also judge whether these elements work normally. today Huai'an Crane Rental Company Let us know what is the main reason for the water temperature of crane engine?
1. Inspection of thermostat;
At present, paraffin thermostat is mainly used for crane On the engine. Its main performance index is that the thermostat should have different lift under different water temperatures. Therefore, the cooling water temperature can be dynamically controlled. Check the thermostat without disassembling the cooling system, mainly based on the temperature difference between the radiator inlet pipe and outlet pipe.
During the first stage of cold start of the engine, when touching the intake pipe and exhaust pipe by hand, there should be a significant temperature difference between the intake pipe and exhaust pipe. After working for a period of time, the temperature difference decreases significantly. When the engine reaches the normal operating temperature (80 ℃ - 90 ℃), there is no obvious temperature difference during manual operation. Of course, a very accurate detection method is to remove the thermostat, place it in hot water, gradually heat it, and then check the opening temperature and lift of the valve.
2. Inspection of water pump;
The power supply for the continuous circulation of cooling water in the cooling system comes from the water pump. Whether the water pump can establish sufficient pressure is the key to the normal operation of the cooling system. When adding cooling water, if the cooling liquid level decreases significantly with the increase of engine speed, it indicates that the water pump works normally. Otherwise, the water pump and impeller may become loose and the cooling water cannot circulate.
Huai'an Crane Rental In small crane In the engine, the water pump, generator and cooling fan share one belt, so the tightness of the belt directly affects the speed of the water pump, fan and generator. Press the middle of the safety belt with your finger, and the lower deflection should be 11-13mm (model cpc3l). If it is too high, the water temperature will be too high; If it is too low, the water pump bearing and generator bearing will be damaged.
3. Cooling fan;
In order to test the fan air volume, place a thin paper in front of the radiator. When the engine is running, if the paper can be blown away, it indicates that there is enough air. This is the same as the previous crane The car fan of the engine sucks in differently. The blades shall not be installed upside down, and the fan exhaust hood shall be intact.
