In general, the cooling system of a small crane is relatively simple, usually consisting of cooling fans, radiators, thermostats and other components. The cooling fan is directly driven by the engine, and the fan speed is consistent with the engine speed. The control of the cooling water temperature mainly depends on the thermostat. This is quite different from the electronic fan controlled by a temperature sensor, the radiator with an adjustable shutter, and the like used in ordinary automobiles. This structure is characterized by easy maintenance and low cost. The disadvantage is that the control of the cooling water temperature is insensitive.
The temperature of the engine water is mainly related to whether the thermostat works normally, whether the pump can establish enough pressure, Small Crane and whether the cooling fan can reach the standard speed. Judging the failure of the cooling system should also begin by judging whether these components are working properly.
Check the cooling fan: The detection of the air volume of the fan can place a thin paper in front of the radiator. When the engine is running, if the paper can be blown open, the air volume is sufficient. This is different from the inward suction of the front-engined car fan. The blades cannot be installed in reverse, and the fan guards should be complete and effective.
Check the water pump: The power source of the cooling water circulating in the cooling system comes from the water pump. Whether the pump can establish enough pressure is the key to the normal operation of the cooling system. Small Crane When adding cooling water, if the coolant surface drops significantly as the engine speed increases, this indicates that the pump is working properly. On the contrary, the pump and the impeller may be loosened and the cooling water cannot be circulated. In the small crane engine, the water pump, the generator, and the cooling fan share a single belt, so the tightness of the belt directly affects the speed of the water pump, fan, and generator. Press down the middle of the belt with your fingers, the lower deflection should be 11-13mm (CPC3L model) is normal, too large will cause the water temperature is too high, too small will cause damage to the water pump bearing, generator bearing.
Check thermostat: At present, the thermostat used on the engine is mainly wax type thermostat. Its main performance index is that the thermostat should have different lift at different water temperatures. In order to dynamically control the cooling water temperature level. The quality of the thermostat is determined by the temperature difference between the inlet and outlet pipes of the radiator. In the early period of engine cold start, the inlet and outlet pipes should have obvious temperature difference when they are touched by hand. After working for a period of time, the temperature difference is obviously reduced. When the engine reaches the normal operating temperature (80°C-90°C), Small Crane no sense of temperature difference is apparent by hand. Of course, the most accurate detection method is to remove the thermostat, place it in hot water, gradually heat up, and check the opening temperature of the valve and the lift of the valve.
When the crane's engine has a water temperature problem, starting from these three aspects, the problem can be solved in most cases. Small Crane Hopefully the above content will help the majority of owners and drivers.