Details: Mr. Wang, a Komatsu PC215-10M0 excavator now has more than 8000 hours, and the machine operating environment is road construction. During the operation of the machine, the boom is slowly and weakly lifted, and the bucket is turned over normally. The failure occurs for about half a month, and due to the tight construction period, it has not been dealt with temporarily.
Analysis: The excavator bucket is turned over normally, indicating that the excavator working pump and the main safety valve are working normally, the excavator pressure is sufficient, and it also shows that the oil quantity and quality of the oil filter and the oil tank are no problem. At this time, it is only necessary to check the boom spool valve, boom cylinder, boom oil pipe, and their seals.
an examination:
Komatsu PC215-10M0 excavator is working slowly to lift the boom and the power is slow. On-site test machine, the boom is too slow when the operation is too high; the operation is all normal.
Check the oil removal pipe, remove the valve body, stem and related parts of the boom spool valve for cleaning. Take the piston of the boom cylinder to the bottom and remove the oil pipe without rod cavity to make the boom cylinder with rod cavity continue to be filled with oil. Observe the rodless cavity There is a large withdrawal of working oil from the oil pipe port, indicating that the hydraulic cylinder has an internal leak.
Disassembling the hydraulic cylinder of the boom and inspecting, and found that there is a crack in the cylinder. Repair the hydraulic cylinder, install the re-test machine, and the fault disappears.
The above is the specific cause analysis and maintenance method of the Komatsu PC215-10M0 excavator's slow and heavy lifting of the boom and the weak movement of the arm.
