Common fault analysis of long arm of excavator
Posted: Nov 7th, '24, 21:13
Analysis of various faults after the excavator lengthened the arm:
1: Wheeled excavatorwalk right and dig bucket without posture, and the moving arm and bucket rod are slow
According to the boss of the wheeled excavator, this failure occurred after replacing the tightness of the pressure regulator. After the test, the pressure of the pump when collecting the bucket is 1·5Mpa, which is far lower than the standard value of 28·5Mpa. When preparing the safety valve for interchanging two ways in advance, it is found that the safety valve part on the fault side is a plug, but the safety valve is installed in the position of the original plug. The equipment worked fine after the proper parts were exchanged. After replacing the seal of the total process of the pressure regulator, the safety valve of the group of valves is reversed with the plug part.
2: After transforming the excavatorand lengthening the arm, the vehicle is slow and weak
The equipment reflects that the pilot oil valve seal has just been removed, but after the removal, everything has been normal for more than ten minutes, and then suddenly it is not possible. According to this situation, the first suspicion is that the pilot pressure is not enough. After detecting the pilot pressure is very low, the decision is made to dissolve the pilot pump. The first discovery is that the skeleton seal of the pilot pump input shaft has been squeezed, and there are two reasons for this: one is the installation problem, and the other is that the pressure here is too high. Redissolution found that the sealing ring azimuth of the pilot pump was reversed. Here is the real reason for the failure, when the first operation, the skeleton seal is not completely destroyed, can still be conventional work, because the skeleton seal only bear low voltage, so the seal ring is rapidly destroyed, resulting in pilot pressure oil leakage from the damage.
3: After transforming the long arm of the excavator, the piston rod of the bucket rod hydraulic cylinder automatically retracts after the car engine starts, and all other positions are normal.
After inspection, all the other postures are normal; Two mentioned that the moving arm after the bucket rod down faster. The fault persists after the bucket rod pilot tube is exchanged, indicating that the fault is in the pressure regulator or bucket rod hydraulic cylinder, in line with targeted standards. Remove the control valve seat, find the valve seat stuck in the hydraulic cylinder retracted part, vibrate with plastic mantis head and copper rod and remove the valve seat. It can be seen that there is shining iron dust, and the contact bucket rod moves down faster. The root cause of the fault was identified as the contusion of the cylinder liner of the long arm bucket rod of the excavator, and the hydraulic cylinder of the bucket rod was confirmed after disassembly.
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email : sales@bonovogroup.com
1: Wheeled excavatorwalk right and dig bucket without posture, and the moving arm and bucket rod are slow
According to the boss of the wheeled excavator, this failure occurred after replacing the tightness of the pressure regulator. After the test, the pressure of the pump when collecting the bucket is 1·5Mpa, which is far lower than the standard value of 28·5Mpa. When preparing the safety valve for interchanging two ways in advance, it is found that the safety valve part on the fault side is a plug, but the safety valve is installed in the position of the original plug. The equipment worked fine after the proper parts were exchanged. After replacing the seal of the total process of the pressure regulator, the safety valve of the group of valves is reversed with the plug part.
2: After transforming the excavatorand lengthening the arm, the vehicle is slow and weak
The equipment reflects that the pilot oil valve seal has just been removed, but after the removal, everything has been normal for more than ten minutes, and then suddenly it is not possible. According to this situation, the first suspicion is that the pilot pressure is not enough. After detecting the pilot pressure is very low, the decision is made to dissolve the pilot pump. The first discovery is that the skeleton seal of the pilot pump input shaft has been squeezed, and there are two reasons for this: one is the installation problem, and the other is that the pressure here is too high. Redissolution found that the sealing ring azimuth of the pilot pump was reversed. Here is the real reason for the failure, when the first operation, the skeleton seal is not completely destroyed, can still be conventional work, because the skeleton seal only bear low voltage, so the seal ring is rapidly destroyed, resulting in pilot pressure oil leakage from the damage.
3: After transforming the long arm of the excavator, the piston rod of the bucket rod hydraulic cylinder automatically retracts after the car engine starts, and all other positions are normal.
After inspection, all the other postures are normal; Two mentioned that the moving arm after the bucket rod down faster. The fault persists after the bucket rod pilot tube is exchanged, indicating that the fault is in the pressure regulator or bucket rod hydraulic cylinder, in line with targeted standards. Remove the control valve seat, find the valve seat stuck in the hydraulic cylinder retracted part, vibrate with plastic mantis head and copper rod and remove the valve seat. It can be seen that there is shining iron dust, and the contact bucket rod moves down faster. The root cause of the fault was identified as the contusion of the cylinder liner of the long arm bucket rod of the excavator, and the hydraulic cylinder of the bucket rod was confirmed after disassembly.
Choose DIG-DOG for high-quality, customizable brush cutters for skid steers with fast delivery. Contact us today to discover how our superior products can enhance your land management tasks!
for more info just visit our website at www.dig-dog.com
contact # : +86 158 6218 2088
email : sales@bonovogroup.com