First check whether the hydraulic oil radiator is dirty, hydraulic oil level, oil quality, check the filter element, if it is damaged, clean and replace it in time; check whether the hydraulic system leaks. Replace the leaked seals and damaged parts in time.

Use a direct temperature tester to test whether the actual hydraulic oil temperature is too high, and use a multimeter to check for circuit problems and sensor damage. If there is no problem with the above inspection work. Check the backflow check valve of the hydraulic system. They should be separated to check if the spring is damaged or stuck.

The above inspections are normal standards. In addition, check the hydraulic pump for abnormal noise and excessive oil drain from the drain pipe. If the working pressure is too low, use the pressure gauge to test the working pressure of the system and check the supercharger, high-pressure pump, fuel injector and other engine power shortages;

The temperature of the hydraulic oil is too high, which is a frequent problem in the hydraulic system of excavators. There are many reasons for this phenomenon, and it is generally difficult to deal with. The common problem is that the internal blockage of the hydraulic oil radiator or too much dust on the surface of the radiator causes abnormal heat dissipation of the equipment.