Refer to the previous article which called "Causes of high temperature of hydraulic oil in hydraulic excavator" for the reasons of oil temperature rise, and find the corresponding solutions from these reasons.
1. If it is high temperature caused by local pressure relief, it can be directly measured by far-infrared thermometer to see which actuator has high temperature and replace it.
2. Check whether the two check valves are stuck. If the check valve is stuck by foreign material, remove the foreign material. Or replace the two check valves.
3. Check the solenoid valve of the fan motor, or replace a solenoid valve to see if the fan speed changes when the solenoid valve is on or off. If not, replace the solenoid valve. After the replacement of the solenoid valve, the fan speed is still not obvious. It is necessary to check the fan motor. It may be that the internal wear and pressure relief of the fan motor cause the speed can not be increased. Replace the motor.
4. Check the surface of the hydraulic oil radiator to see if it is too dirty and clean it. If the hydraulic cylinder of the excavator is often damaged and replaced frequently, the high temperature of the hydraulic oil caused by the blockage of the radiator should be considered first. The internal structure of the hydraulic oil radiator is special and cannot be cleaned, so it must be replaced.