This paper describes the maintenance example of Komatsu excavator's inability to lift the boom. The specific model is Komatsu pc215-10m0.
Details: a Komatsu pc215-10m0 excavator now has more than 8000 hours, and the working environment of the machine is road construction. During the operation of the machine, the lifting boom is slow and weak, and the turning bucket overturns normally The fault occurred for about half a month, and it was not handled temporarily due to the tight construction period.
Analysis: the turning of the excavator bucket is normal, which indicates that the excavator working pump and the general safety valve are working normally, and the excavator pressure is sufficient. At the same time, it also indicates that the oil quantity and quality of the oil filter and oil tank are OK. At this time, it is only necessary to check the boom spool valve, boom cylinder, boom oil pipe and its seals.
Check:
Komatsu pc215-10m0 excavator is unable to lift the boom when working, and the action is slow. The on-site test machine is operated too fast, and the boom speed is slow and weak; The operation of rotation or other actions are normal.
Disassemble the oil pipe for inspection, disassemble the boom spool valve body, valve rod and related components for cleaning Close the boom cylinder piston to the bottom, remove the oil pipe without rod chamber, and continue to fill the rod chamber of the boom cylinder Observe that there is a large drain of working oil at the oil pipe port of the rodless chamber, indicating that the hydraulic cylinder has internal leakage.
Disassemble the boom hydraulic cylinder and check it. Cracks are found in the cylinder Repair the hydraulic cylinder, install the retest machine, and the fault disappears.
The above is the specific cause analysis and maintenance methods of Komatsu pc215-10m0 excavator's weak lifting boom and slow action.
