The excavator looks tough on the surface, but the internal components are actually very fragile. Therefore, we need to maintain, so that we can better use the mechanical equipment, improve the performance of the mechanical equipment, improve work efficiency, and reduce costs. However, improper maintenance is prone to problems, which will affect the normal use of the excavator.
For example, a master named Li in Zhaotong, Yunnan, found his Hitachi ZX330-3 excavator's forearm movement was slow and sluggish when operating the excavator. At the beginning, he was going to report to the Hitachi excavator after-sales department for inspection and repair. However, due to the long wait, the work cannot be performed normally. Mr. Wang decided to call the local Zhaotong Hitachi excavator repair point-Meiruite Repair Factory. Master Lei of Zhaotong Hitachi Excavator Repair Factory explained this reason with four points!
According to the analysis, Master Lei of the excavator repair center initially judged the reason for the slow and sluggish movement of the forearm of the ZX330-3 excavator:
1. The forearm action handle plunger wears and leaks, which will cause the forearm to move slowly and weakly. Because once the handle plunger is worn, the pressure of the forearm control oil circuit cannot reach the state of opening the forearm valve stem, which will directly cause the flow of the forearm to decrease, which will cause the speed to be slow and weak.
Treatment: In this case, replace the handle plunger, or directly replace the handle assembly if it is serious.
2. The main control valve arm stem is worn or stuck. This phenomenon is common. It is usually caused by the valve stem not sliding smoothly back and forth in the valve body, and the stem spring is broken.
Treatment: If it is determined that the stem spring is broken, the situation can only be solved by replacing the stem.
3. The forearm oil port relief valve (overload valve) wears out, causing the forearm to move slowly and weakly
Treatment: In this case, adjust the overflow valve first. If there is no change in the adjustment, disassemble and clean the oil port overflow valve. If it is worn, it must be replaced with a new one. Do not polish it and continue using it.
4. If the piston oil seal of the forearm cylinder is damaged, no matter how you adjust the relief valve and clean the valve stem in this case, it will be ineffective. Usually the oil seal is damaged, and the forearm will fall off, and both ends will An arm drop has occurred.
Treatment: In this case, you can directly replace the oil seal of the forearm cylinder to solve the problem of slow movement and lack of force.
The above 4 points are the reason why the forearm movement of Hitachi ZX330-3 excavator is slow and boring. Tips: Every old driver should deal with it as soon as he discovers that the excavator is malfunctioning. The most direct way is to contact the local Zhaotong Hitachi excavator repair point, so that someone will come to repair and troubleshoot.
