Second hand excavators are unable to analyze and solve problems

Second hand excavators, a product of high-speed industrial development, have been updated and replaced with various excavator products. The transaction of second-hand excavators has gradually matured in recent yearsSecond hand excavator maintenanceThe development is relatively fast. With the advancement of technology, Hyundai excavators generally adopt an integrated control mode of electromechanical and hydraulic systems. When the matching of the engine, hydraulic pump, distribution valve, and external load is not coordinated, some problems may occur. The weakness of excavators is one of the typical accidents of second-hand excavators. Today, we will analyze the causes and solutions of the weakness of second-hand excavators.

There are two types of situations where second-hand mining is ineffective: the first is when the engine is not holding up the car and the load feels light; The second type is when the boom or stick extends to the bottom, causing severe engine stalling or even stalling.

Firstly, let's analyze the first scenario, which is when there is no power to mine but the engine is not holding up the car. The magnitude of excavation force depends on the output pressure of the main pump, while whether the engine is stuck or not is determined by the relationship between the torque absorbed by the oil pump and the output torque of the engine. The engine is not stalling, which indicates that the oil pump absorbs less torque and the engine load is light. If there is no obvious abnormality in the working speed of the excavator at this time, the maximum output pressure of the main pump, that is, the system overflow pressure, should be checked as a priority. If the relief pressure value is lower than the specified value, it indicates that the overload relief valve setting of the hydraulic circuit of the mechanism is incorrect. At this time, it is necessary to turn the adjustment screw to adjust the machine.

The second scenario is when the excavation is powerless and the engine is stalling. Compared to idling the engine, idling the engine indicates that the absorption torque of the oil pump is greater than the output torque of the engine, resulting in engine overload. This type of malfunction should first be checked to see if the engine speed sensing system is functioning properly. After a detailed inspection, the problem can be resolved, and the engine speed sensing system will resume normal function, thus eliminating the phenomenon of stalling.
Improper modification of the broken hammer connection resulted in excavator stalling Stuck up caused by excavator nozzle issues
There are many faults encountered by second-hand excavators in daily work. In order to reduce the occurrence of faults, we need to pay attention to the daily maintenance of excavators, so as to prevent them in advance. Only by focusing on both maintenance and upkeep can we ensure that excavators work better and reduce maintenance costs and time for us.