If the excavator is not maintained in time, various failures may occur. The following is an analysis of the excavator's inability:
（1） The engine has sufficient power and operates normally, while the excavator operates slowly and is unable to excavate.
The hydraulic pumps of excavators are mostly variable piston pumps. After a certain period of operation, the internal parts of the pump will inevitably wear, causing internal leakage. The data of various parameters are not coordinated, resulting in insufficient flow, high oil temperature, slow speed, and failure to establish high pressure, so the action is slow and ineffective. For such problems, it is necessary to remove the hydraulic pump for data measurement, confirm the problem, replace the parts that can no longer be used, or repair the parts that can continue to be used. After reassembly, perform bench testing and debugging, and match the parameters of each circuit (pressure, flow, power, variable, etc.).
An important hydraulic component on the excavator, the multi way distribution valve, has a main safety valve, a secondary valve, an overflow valve, a makeup valve, etc. If the pressure set by these valves does not reach the standard pressure, the excavation will be weak.
In addition, if the clearance between the valve stem and the valve hole is too large due to wear, the valve stem return is incomplete and the direction of rotation is not in place, a large amount of internal leakage will occur, resulting in insufficient flow and slow speed.
For such problems, the multi way distribution valve should be removed and sent to the test bench for debugging, and the pressure of all valves should be reset to the standard pressure to eliminate the gap between the valve stem and the valve hole.
（2） Everything is normal when the engine is cold, but the action is slow when the engine is hot, and the excavation is weak.
The occurrence of such a problem indicates that the internal accessories of the hydraulic pump are seriously worn. The wearing parts in the pump must be replaced, and the test bench shall be reassembled and adjusted for calibration and commissioning.
Another main reason for the slow and weak operation of the excavator is the deterioration of the hydraulic oil. Therefore, we should pay attention to monitoring the quality of the hydraulic oil (viscosity, fluidity and whether there are suspended solids, etc.), and replace the hydraulic oil that meets the requirements on time, which can largely avoid such failures.
There are two main reasons for the excavator's inability to work, which are explained above. If you want to know anything about this, please come to our website http://www.ycgjglcl.com Look!