Talking about the inspection method for the abnormal water temperature of the electric forklift
1. Check that the power source for the continuous circulation of the water pump cooling water in the cooling system comes from the water pump. Whether the water pump can build up a satisfactory pressure is the key to the normal operation of the cooling system. When increasing the cooling water, if the coolant level drops significantly as the engine speed increases, this indicates that the water pump is working normally. On the contrary, perhaps the water pump and the impeller are loose, and the cooling water cannot circulate. In the domestic forklift engine, the water pump, generator, and cooling fan share a belt, so the tightness of the belt directly affects the speed of the water pump, electric fan, and generator. Press down the middle of the belt with your fingers. The downward deflection should be 11-13mm (CPC3L models). It is normal. Too much will cause the water temperature to be too high, and too small will cause damage to the water pump bearings and generator bearings. Second, check the thermostat The thermostats currently used on engines are mainly wax-type thermostats. Its main performance index is that the thermostat should have a different lift under different water temperatures. Then dynamically control the height of the cooling water temperature. Regarding the non-disintegrating cooling system, the quality of the thermostat is mainly judged by the temperature difference between the inlet pipe and the outlet pipe of the radiator. During the first period of the engine's cold start, there should be a significant temperature difference between the water inlet and outlet pipes by hand. After working for a period of time, the temperature difference will be significantly reduced. When the engine reaches the normal operating temperature (80℃-90℃), there is no significant temperature difference feeling when it is touched by hand. Of course, the most accurate detection method is to remove the thermostat, place it in hot water, and gradually heat it to check the opening temperature of the valve and the lift of the valve. 3. Check the detection of the air volume of the cooling fan. A thin piece of paper can be placed in front of the radiator. When the engine is running, if the paper can be blown away, the air volume is satisfactory. This is different from the front-engine car fan sucking inward. The blades cannot be installed backwards, and the fan guard should be fully and effective.
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