What is the reason for the broken arm of Sany excavator?

1. Hydraulic oil failure caused the arm to fall off. The cold car is normal, and the hot car has a broken arm. There is probably something wrong with the hydraulic oil.

2. The hydraulic cylinder of the excavator is out of order, especially the oil seal of the hydraulic cylinder is damaged or aged, resulting in internal leakage of the oil seal.

3. The distribution valve hole is blocked, the valve core is worn, the valve core gap is too large, and the main safety valve of the distribution valve is worn and damaged, resulting in the boom of the big and small arms.

4. When the oil seal of the safety relief valve of the boom and the boom is damaged, it will cause a certain leakage, and it will also lead to the phenomenon of arm falling off.

5. It is also called "oil unloading" because the sealing of the distribution pump is not good, so it is necessary to replace the sealing ring of the distribution pump.

6. Poor contact of the hydraulic pump proportional solenoid valve connector will also cause the big and small arms to fall off.

7. Serious arm loss (the oil temperature is about 45℃, and the bucket teeth drop by more than 95mm within 5 minutes) is most likely caused by the main valve being stuck.

The solution of excavator arm falling off;

1. Check the working environment temperature of the excavator, whether the hydraulic oil model is improperly selected, and whether inferior hydraulic oil is used.

2. When the arm falls off, you can first reduce the pressure of the boom and carefully observe whether the boom will fall off soon.

3. Check whether the hydraulic cylinder and cylinder oil seal are faulty. Poor oil seal will lead to oil leakage. Replace the oil seal in time.

4. After replacing the oil seal, if the arm is still missing, check the distribution valve and the boom oil return safety valve.

5. Check whether the working pressure and pilot pressure of the main hydraulic pump of the excavator meet the requirements.

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