Common failure causes of long arm of excavator

With the development of construction projects, the extended arm of excavators is used more and more, especially for municipal construction, subway traffic, sewage reconstruction and other projects, because it can better help excavators realize the excavation operations of building foundations, rivers, deep trenches and other earth and rock, and the performance is self-evident. However, after the use of the long arm of the excavator, there will often be some failures, what are the respectively? The following excavator manufacturers to give you a good introduction.

There is no movement of excavator walking and bucket, and the movement of boom and bucket rod is slow

Many people report that this failure occurs after replacing the seal of the control valve assembly. After the test, the pressure of the pump when the bucket is collected is 1.5Mpa, which is far less than the normal value of 28.5Mpa. Getting ready to exchange two lines of security. When the valve is full, a plug is found on the faulty side, but a safety is installed on the original plug. Full valve. The machine is normal after the correct position is changed. After replacing the seal of the control valve assembly, the original maintenance personnel installed the valve and the plug position of the valve group in reverse.

After being converted into an excavator with a long arm, the whole car is slow and weak

Some people reflect that the pilot pump oil seal has just been replaced, but after the replacement, it has been working normally for more than ten minutes, and then suddenly it is not working. According to this situation, it is suspected that the pilot pressure is insufficient. After testing the pilot pressure of the long arm of the excavator is very low, it is decided to decompose the pilot pump.

It is found that the skeleton oil seal of the input shaft of the pilot pump has been extruded, and there are two reasons for this: one is the installation problem, and the other is the pressure there is too high. It is found that the direction of the oil seal of the pilot pump is reversed. This is the cause of the failure, when the first work, the skeleton oil seal is not completely damaged, can still work normally, because the skeleton oil seal can only withstand low pressure, so the oil seal is quickly damaged, resulting in pilot pressure oil leakage from the damage.

The piston rod of the bucket rod cylinder retracts automatically after the engine starts

After examination, the other movements are normal; The bucket rod sinks faster after the two lifting boom. The fault is still the same after exchanging the pilot pipe of the bucket rod, indicating that the fault is in the control valve or the bucket rod cylinder, in line with the principle of easy first and difficult later. Disassemble the control valve stem and find that the valve stem is stuck in the retracted position of the piston rod. Remove the valve stem after shaking with the rubber beetle head and copper rod. Visible shiny iron dust, contact bucket rod sinking faster. It was determined that the root cause of the fault was the pull of the cylinder of the long arm bucket rod of the excavator, and it was confirmed after dismantling the bucket rod cylinder.

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