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Analysis and solution of pressure relief defects of mini excavator arms If the pressure relief of the arms is not very serious, it is generally a normal phenomenon. It depends on how long it takes for the arm to fall to the ground when the arm is raised to the highest and the forearm and bucket are straightened. The normal pressure relief standard of a small excavator is 50ml per hour. If the arm of a small excavator drops automatically during operation, and the drop speed is very fast, exceeding the specified drop distance (the bucket tooth drops more than 95mm in 5 minutes), this is the pressure relief of the arms of the small excavator, also called arm drop. 1. What is the reason for the pressure relief of the arms of a small excavator? 1. The pressure relief of the arms of a small excavator is mainly caused by the movement of the boom, dipper rod or bucket cylinder when the small excavator is fixed. 2. When the multi-way valve is in the middle position, due to the effect of the gravity of the operating equipment, a certain pressure is generated in the oil cylinder. This pressure is transmitted to the multi-way valve through the pipeline. Because there must be a certain gap between the valve cores of the multi-way valve, a certain leakage is formed, resulting in the pressure relief (arm-dropping) phenomenon. Therefore, the small excavator indicates in the manual that the bucket must be supported when the excavator is not working. 3. In addition, if the arm-dropping phenomenon is serious in some parts (the oil temperature is about 45℃, and the bucket teeth drop more than 95mm in 5 minutes), it may be due to the multi-way valve being stuck. Please clean the multi-way valve. 4. First, look at the color of the inner core of the arm-dropping hydraulic shaft under natural light. If it is blue-black or colorful, it means that the oil cylinder is leaking oil, which is a problem with the oil seal. Just change a set. If the oil seal is normal, the inner core is silver-white. 5. The oil seal cannot or the oil seal of the multi-way valve is leaking. 6. The hydraulic pump seal is not good, commonly known as "unloading oil". Just change the seal ring of the hydraulic pump. 2. Solutions to relieve pressure on the arms of small excavators 1. Analyze the temperature of the working environment of the small excavator and the maximum load that the small excavator can accept. 2. After making an accurate judgment, select the appropriate brand hydraulic oil according to the ambient temperature of the small excavator and the load conditions of the small excavator. 3. Replace and maintain the filter element regularly, and pay attention to purchasing genuine hydraulic oil. 4. When the arm drops during operation, you can first adjust the arm pressure to a lower level (smaller than the normal pressure) to observe whether the arm will fall quickly? 5. If the falling speed is very fast, it is recommended to replace the arm oil seal. 6. If the defect still exists after replacing the oil seal, it is necessary to check the arm oil return safety valve. 7. Check the pressure value of the excavator pump valve group.

In view of the particularity of the application scope of small excavators, end users must not conduct preliminary investigation and preparation for the following conditions before operating a small excavator:   1. Before entering the construction site, you need to carefully understand the construction conditions and tasks. After entering the work site, you should strictly abide by the relevant safety regulations of the construction site. The construction conditions and tasks include: the height and depth of filling and excavation, the status and location of exposed cables, various pipes, slopes and wire heights, tombs, tunnels and various obstacles. 2. Carefully check whether the circuit switch contacts and insulation are in good condition. 3. Check whether the fuel, lubricating oil and coolant of the excavator are sufficient. If they are insufficient, add them in time. When adding fuel, it is strictly forbidden to smoke or be close to an open flame to avoid causing a fire. 4. Check the pipelines and operating valves, working cylinders, oil pumps, etc. of the hydraulic system for leaks and abnormal movements. 5. Check whether the wire rope and the clips fixing the wire rope are firm and secure. 6. When the excavator is operating in rocky soil or frozen soil, blasting should be stopped first, and then excavation should be stopped. 7. Inspect, maintain, adjust and tighten the excavator according to daily routine maintenance items. 8. Place the main clutch control lever in the "neutral" position and start the engine (if you start by hand, be careful that the handle may hit someone; if you start with a hand pull rope, do not wrap the pull rope around your hand). Check whether each instrument, transmission mechanism, working device, and braking mechanism are normal. Only after confirmation is correct can you start working. 9. After the engine is started, personnel are strictly prohibited from standing in the bucket, on the arm, on the tracks and in the cab.  

1. Analyze the temperature of the working environment of the small excavator and also analyze the maximum load that the working object of the small excavator can bear. 2. After making an accurate judgment, select the appropriate brand of hydraulic oil based on the ambient temperature of the small excavator's operating area and the load conditions of the small excavator's working object. 3. Replace and maintain the filter element regularly, and pay attention to purchasing genuine hydraulic oil. 4. When the boom phenomenon occurs during operation, you can first reduce the pressure of the boom (less than the normal pressure) and observe whether the boom will fall quickly? 5. If the falling speed is very fast, it is recommended to replace the boom oil seal. 6. If the fault still exists after replacing the oil seal, you need to check the boom oil return safety valve. 7. Check the pressure value of the excavator pump valve group.