When operating the excavator, users often find that there are various faults in the excavator, such as "weakness of limbs" in the excavator. If there is any disease, it should be treated in time, otherwise the condition will further deteriorate. Yesterday, someone in the excavator group asked him that when he was working with the sk210lc-8 excavator of Kobelco, he showed a phenomenon of continuous weakness. When the excavator is weak, you need to check the engine power of the excavator and whether the internal parts of the excavator are worn. The following are two factors that affect the weakness of the excavator. You can watch carefully.
Question 1: does the engine have enough power and operate normally, but the excavation is weak?
Two situations:
1. The excavation is weak, but the engine does not hold the car. I feel the load is very light.
Cause: the setting value of the overload overflow valve of the hydraulic circuit is incorrect, which causes the mechanism to work weakly.
2. The excavation is weak. When the boom or stick is extended to the bottom, the engine will be seriously blocked or even shut down.
Cause: Engine holding indicates that the absorption torque of the oil pump is greater than the output torque of the engine, resulting in engine overload.
Countermeasure: check whether the engine speed sensing system is normal.
Problem 2: the excavator is weak after working normally for a certain time
Causes: the internal parts of the main pump (mostly variable piston pump) are worn / the wear clearance between the valve stem and the valve hole of the multi-way distribution valve (main safety valve, secondary valve, overflow valve, etc.) is large / the pilot gear pump is excessively worn, resulting in internal leakage, resulting in insufficient flow and high oil temperature, and stable oil pressure cannot be established.
Countermeasures: replace / repair worn parts, recombine and debug, and match the parameters of each circuit.
Summary: through this small fault performance, it seems that the problem is very simple, but in fact, it is not. There are many reasons for a fault performance, but we should not worry. As long as we understand its working principle, have a clear mind, and conduct troubleshooting in order, we believe that the fault point of the problem will be quickly found.
In addition, we should also remind everyone that the excavator has complex working conditions and heavy load, and it still needs to be maintained and tested on time. In this way, the fault phenomenon can be found in time, and the maintenance can be carried out quickly, saving time and maintenance costs. Of course, how to remove the traveling weakness fault of the excavator must be solved one by one according to the actual situation. First, determine whether the working device and the slewing structure work normally. The best way is to contact the local excavator maintenance factory, which is also the fastest and most convenient way.
