Assuming that the pressure relief of the upper and lower arms is not very severe, it is generally a normal phenomenon, and the upper arm is raised the highest, the lower arm and the bucket are straightened, and how much time the upper arm can fall to the ground. The normal pressure relief standard of small excavator is 50ml per hour, assuming that the large arm of the small excavator actively falls in the operation, and the falling speed is very fast, and the regular falling distance is exceeded (the bucket teeth drop exceeds 95mm in 5 minutes), which is the pressure relief of the small arm of the excavator.

1. What is the cause of pressure relief for small excavators, small excavators and tailless excavators?

1. The phenomenon of pressure relief of the big arm of the small excavator is mainly caused by the movement of the boom, bucket rod or bucket cylinder when the small excavator is fixed.

2, in the middle of the multi-way valve, due to the effect of gravity of the operating equipment, a certain pressure occurs in the cylinder, and this pressure is transmitted to the multi-way valve through the pipeline, because there is a certain gap between the multi-way valve spore, the formation of a certain leak, the formation of pressure relief (drop arm) phenomenon, so the small excavator indicates in the manual that the excavator is not working, the bucket is necessary to support the ground.

3. In addition, some of the arm drop phenomenon is severe (oil temperature is about 45 ° C,5 minutes bucket teeth drop beyond 95mm), perhaps due to the shortcomings of the multi-way valve is stuck, please clean the multi-way valve.

4. First look at what color is the inner core of the hydraulic shaft of the drop arm under natural light? If it is blue, black or colored, it indicates that the oil cylinder is leaking oil, and it is an oil seal problem. Just change it. If the oil seal is normal, the inner core is silver.

5. The oil seal may not leak inside the oil seal of many valves.

6, the hydraulic pump seal is not good, commonly known as "unloading". Just change the seal ring of the hydraulic pump.

Second, the solution of small excavator big arm pressure relief

1. Analyze the temperature of the working circle of the small excavator and also analyze the maximum load that the working object of the small excavator can accept.

2. After making accurate judgments, the suitable trademark hydraulic oil is selected according to the ambient temperature of the small excavator and the load conditions of the small excavator

3, and regularly replace the maintenance filter element, should pay attention to the purchase of genuine hydraulic oil.

4, when the phenomenon of arm drop occurs in the operation, you can first reduce the pressure of the boom (less than the normal pressure), and investigate whether the boom will soon fall?

5, assuming that the falling speed is very fast, it is advocated to replace the boom oil seal.

6, assuming that after replacing the oil seal, the shortcomings still exist, you need to check the boom return oil safety valve.

7. Check the pressure value of the pump valve group of the excavator.

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