Small excavator can not lift the big arm
Posted: Nov 27th, '24, 01:32
1. The large arm of a small excavatoris unable to lift
Defect diagnosis
Mini excavator
If there is no strength in the lifting of the big arm when the small excavator is used in the operation, but there is no problem in other parts, and the hydraulic system of the small excavatorhas a satisfactory pressure supply, it will clean up the shortcomings caused by the problems of the operating pump and safety valve of the hydraulic system. Together, it can also clean up the shortcomings caused by the problems of the oil and oil filter selected by the hydraulic system. After cleaning up the above influencing factors, it can be recognized that the problem is mainly in the small excavatorarm. Then we must carefully inspect and check the oil valve, sealing parts and tubing of the large arm of the small excavator to find the specific defect trigger point.
When the specific shortcomings are found, the valve body and tubing of the large arm of the small excavatorare first removed and cleaned, and the oil circuit is carefully inspected to identify whether there is a blockage problem. Secondly, carefully check whether the sealing parts have loose joints, damage and failure phenomenon, but also check whether the oil circuit oil leakage problem. After checking the above mentioned local problems, if the oil pipe in the rodless chamber of the big arm is disassembled, the oil is constantly filled with oil, and carefully check whether there is oil seepage at the gate, and then admit whether there is really a problem with the cylinder. After all, it is also necessary to check whether the sealing parts in the large arm slide valve of the small excavatorare damaged.
Defect repair
After the completion of the above shortcomings diagnosis operation, if the hydraulic system cylinder oil leakage composed of the big arm lifting shortcomings, it is necessary to disassemble the cylinder and use scientific methods to carefully inspect its internal situation, but if the sealing parts are damaged or scratched to cause the problem of the big arm lifting weakness, it is necessary to seize the time to replace the broken parts. In the operation of checking whether the cylinder is leaking, it is best to use the key orientation inspection method to determine the power of the defect points of different systems and equipment, and to recognize the good orientation of the shortcomings in the shortest time: for the piston rod, it is necessary to check whether it is really damaged, and whether the standard accuracy and concentricity are excellent; Check whether the sealing part of the equipment has aging and wear problems, and whether the accuracy of the sealing groove and the compatibility of hydraulic oil are excellent; Check whether the oil quality and category of hydraulic oil are qualified, whether the pressure degree and viscosity are qualified; Check whether its cycle and sliding speed are normal for the key point of the feed equipment; Check whether there are cracks or welds inside the key of the cylinder, and whether the roughness of the surface is qualified.
Diagnosis and repair method of hydraulic system defect of small excavator
2. The large arm of the small excavatoris normal but the bucket is weak
Defect diagnosis
Assuming that such shortcomings occur, the first step is to carefully study and analyze the mechanical schematic diagram of the small excavator, because the large arm of the small excavatoris no problem and the bucket has no strength, so it can be basically determined that the factors such as the oil filter of the hydraulic system, the work pump, the total safety valve and the oil quality constitute this problem. And only the key detection and investigation of the bucket's slide valve and safety valve sealing parts are really shortcomings can be.
Defect repair
The method used to repair the weakness of this type of bucket is the same as the method used to repair the weakness of the big arm lifting, both of which must first detect whether the equipment has oil leakage orientation, and then replace the broken sealing parts. However, if the shortcomings of a single action of a small excavatoroccur, they are generally caused by problems with the parts that control or implement this action, and then the shortcomings of the control and transmission parts of the small excavator may be cleaned.
Diagnosis and repair method of hydraulic system defect of small excavator
3. The large and forearm of the small excavatorare abnormal
Defect diagnosis
When the small excavatorand the forearm are abnormal, it is not only the problem of damage to a single part of the equipment, and the relief valve in the hydraulic system is slightly in front of the local, that is, the public part of the large arm and the forearm of the small excavatoris the most likely to have some obvious abnormal problems. In view of the shortcomings of such problems, the first test and check whether there is a satisfactory amount of oil in the hydraulic system, the transmission equipment of the hydraulic pump and the recommended parts can also be excellent operation, and the guide oil pipe can be normal.
Defect repair
In the process of repairing anomalies in both the upper and lower arms, because the defect is global, the first step to do is to clean the parts that control and perform the individual movements one by one, and then apply useful inspection and repair operations to ensure that the transmission connection between the upper and lower arms is working properly.
Diagnosis and repair method of hydraulic system defect of small excavator
4 There are some obvious abnormal problems in the control actions of a group of operating valves
Defect diagnosis
Assuming that only a group of operating valve control action shortcomings occur, and the function of the whole small excavatoris very good, it can be accurately determined that it is not the public connection part that causes the shortcomings, but the operation valve that controls this group of actions has shortcomings, the first is the main relief valve of the operating valve or the hydraulic pump of the subsystem caused by some obvious abnormal problems.
Defect repair
When repairing such shortcomings, transposition comparison method is generally used to solve the problem, the specific method is to access the overflow valve with excellent operation function in the overflow valve, and carefully query the effect, and then identify whether the main overflow valve caused the shortcomings. At the same time, the transposition and comparison method can also be used normally in the repair process of the subsystem hydraulic pump, which is conducive to the timely withdrawal and repair of the operator after admitting the fault point.
Choose BONOVO 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.bonovogroup.com
contact # : +86 158 6218 2088
email : sales@bonovogroup.com
Defect diagnosis
Mini excavator
If there is no strength in the lifting of the big arm when the small excavator is used in the operation, but there is no problem in other parts, and the hydraulic system of the small excavatorhas a satisfactory pressure supply, it will clean up the shortcomings caused by the problems of the operating pump and safety valve of the hydraulic system. Together, it can also clean up the shortcomings caused by the problems of the oil and oil filter selected by the hydraulic system. After cleaning up the above influencing factors, it can be recognized that the problem is mainly in the small excavatorarm. Then we must carefully inspect and check the oil valve, sealing parts and tubing of the large arm of the small excavator to find the specific defect trigger point.
When the specific shortcomings are found, the valve body and tubing of the large arm of the small excavatorare first removed and cleaned, and the oil circuit is carefully inspected to identify whether there is a blockage problem. Secondly, carefully check whether the sealing parts have loose joints, damage and failure phenomenon, but also check whether the oil circuit oil leakage problem. After checking the above mentioned local problems, if the oil pipe in the rodless chamber of the big arm is disassembled, the oil is constantly filled with oil, and carefully check whether there is oil seepage at the gate, and then admit whether there is really a problem with the cylinder. After all, it is also necessary to check whether the sealing parts in the large arm slide valve of the small excavatorare damaged.
Defect repair
After the completion of the above shortcomings diagnosis operation, if the hydraulic system cylinder oil leakage composed of the big arm lifting shortcomings, it is necessary to disassemble the cylinder and use scientific methods to carefully inspect its internal situation, but if the sealing parts are damaged or scratched to cause the problem of the big arm lifting weakness, it is necessary to seize the time to replace the broken parts. In the operation of checking whether the cylinder is leaking, it is best to use the key orientation inspection method to determine the power of the defect points of different systems and equipment, and to recognize the good orientation of the shortcomings in the shortest time: for the piston rod, it is necessary to check whether it is really damaged, and whether the standard accuracy and concentricity are excellent; Check whether the sealing part of the equipment has aging and wear problems, and whether the accuracy of the sealing groove and the compatibility of hydraulic oil are excellent; Check whether the oil quality and category of hydraulic oil are qualified, whether the pressure degree and viscosity are qualified; Check whether its cycle and sliding speed are normal for the key point of the feed equipment; Check whether there are cracks or welds inside the key of the cylinder, and whether the roughness of the surface is qualified.
Diagnosis and repair method of hydraulic system defect of small excavator
2. The large arm of the small excavatoris normal but the bucket is weak
Defect diagnosis
Assuming that such shortcomings occur, the first step is to carefully study and analyze the mechanical schematic diagram of the small excavator, because the large arm of the small excavatoris no problem and the bucket has no strength, so it can be basically determined that the factors such as the oil filter of the hydraulic system, the work pump, the total safety valve and the oil quality constitute this problem. And only the key detection and investigation of the bucket's slide valve and safety valve sealing parts are really shortcomings can be.
Defect repair
The method used to repair the weakness of this type of bucket is the same as the method used to repair the weakness of the big arm lifting, both of which must first detect whether the equipment has oil leakage orientation, and then replace the broken sealing parts. However, if the shortcomings of a single action of a small excavatoroccur, they are generally caused by problems with the parts that control or implement this action, and then the shortcomings of the control and transmission parts of the small excavator may be cleaned.
Diagnosis and repair method of hydraulic system defect of small excavator
3. The large and forearm of the small excavatorare abnormal
Defect diagnosis
When the small excavatorand the forearm are abnormal, it is not only the problem of damage to a single part of the equipment, and the relief valve in the hydraulic system is slightly in front of the local, that is, the public part of the large arm and the forearm of the small excavatoris the most likely to have some obvious abnormal problems. In view of the shortcomings of such problems, the first test and check whether there is a satisfactory amount of oil in the hydraulic system, the transmission equipment of the hydraulic pump and the recommended parts can also be excellent operation, and the guide oil pipe can be normal.
Defect repair
In the process of repairing anomalies in both the upper and lower arms, because the defect is global, the first step to do is to clean the parts that control and perform the individual movements one by one, and then apply useful inspection and repair operations to ensure that the transmission connection between the upper and lower arms is working properly.
Diagnosis and repair method of hydraulic system defect of small excavator
4 There are some obvious abnormal problems in the control actions of a group of operating valves
Defect diagnosis
Assuming that only a group of operating valve control action shortcomings occur, and the function of the whole small excavatoris very good, it can be accurately determined that it is not the public connection part that causes the shortcomings, but the operation valve that controls this group of actions has shortcomings, the first is the main relief valve of the operating valve or the hydraulic pump of the subsystem caused by some obvious abnormal problems.
Defect repair
When repairing such shortcomings, transposition comparison method is generally used to solve the problem, the specific method is to access the overflow valve with excellent operation function in the overflow valve, and carefully query the effect, and then identify whether the main overflow valve caused the shortcomings. At the same time, the transposition and comparison method can also be used normally in the repair process of the subsystem hydraulic pump, which is conducive to the timely withdrawal and repair of the operator after admitting the fault point.
Choose BONOVO 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.bonovogroup.com
contact # : +86 158 6218 2088
email : sales@bonovogroup.com