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The working temperature of the gear oil of the normal gearbox can not be higher than 70 degrees, if it exceeds this temperature, it will have a very big impact on the physical properties of the gear oil, there are oil and water heat exchangers outside the normal gearbox, the normal temperature can be slowly lowered, if the temperature continues to be too high, it is recommended to overhaul the heat exchanger, or use other methods to reduce the temperature of the gearbox. Otherwise, the load on the gearbox will be too large, causing damage