2010-03-02
One customerKomatsu 200-7The excavator starts working from 5am every day, takes a 1-hour break at 12pm, and works until 8pm. During this period, there will be 2 to 3 instances of slow movement of the large and small arms around 9am to 10am, 3pm to 4pm, and 5pm. After each malfunction, simply release the operating handle for about 1 minute and the machine can resume normal operation
From the service diagnosis, it can be seen that the reason for the slow movement of the large and small arms is obviously caused by the action of the P2 unloading valve. However, the reason why the P2 unloading valve will move when the large and small arms overflow is still unclear. Due to the fact that two 200-7 type cars had exchanged CPUs on site, the fault still existed after the low-pressure sensor was replaced. Finally, after replacing the high-pressure sensor, as it was a machine operator who had never operated the car before, he said that there were still two brief slow movements after the replacement, but I did not observe it. The second time, the machine operator who had operated the car before continued to work, and he said that there was no further fault phenomenon until now
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