①The hydraulic pump of the excavator is mostly a variable piston pump. After working for a certain period of time, the internal parts of the pump will inevitably wear out and cause internal leakage. The parameter data is not coordinated, resulting in insufficient flow, excessive oil temperature, and slow speed The high pressure is established, so the action is slow and weak. For such problems, the hydraulic pump must be removed for data measurement to confirm the problem, replace the accessories that can no longer be used, or repair the accessories that can continue to be used. Various circuit parameters (pressure, flow, power and variables, etc.).
② An important hydraulic component on the excavator is a multi-way distribution valve, which has a main safety valve, a secondary valve, an overflow valve, a charge valve, etc. If the pressure set by these valves does not reach the standard pressure, it will result in weak excavation. In addition If the gap between the valve stem and the valve hole is too large due to wear, the valve stem is not completely returned, and the commutation is not in place, a large amount of internal leakage will result in insufficient flow and slow speed. Such problems should be removed from the multi-way distribution Send the valve to the experimental bench for debugging, reset the pressure of all valves to the standard pressure, and eliminate the gap between the valve stem and the valve hole.
③The hydraulic pump on the imported excavator is equipped with a pilot gear pump. This pump is mainly involved in the variable of the hydraulic pump and as the pilot oil to open the valve stem of the multi-way distribution valve to change its direction. If the gear pump wears too much, it cannot be established. The pressure or the safety valve setting on the gear pump cannot reach-a fixed pressure will cause the hydraulic pump to always be in a low flow state, and the valve stem cannot be completely reversed, resulting in insufficient flow, slow movement, insufficient pressure, and weak digging For such problems, it is only necessary to change the pilot gear pump or reset the pilot safety valve.
④When the engine is cold-everything is normal, the action is slow when the engine is hot, and the problem of weak excavation indicates that the internal parts of the hydraulic pump are seriously worn out. The wearing parts in the pump must be replaced, reassembled, and tested on the commissioning station.
Another reason why the excavator works slowly and weakly-one of the main reasons is the deterioration of hydraulic oil, so pay attention to monitor the quality of hydraulic oil (viscosity, fluidity and presence or absence of suspended matter, etc.), and replace the hydraulic oil that meets the regulations on time. Can largely avoid the occurrence of such failures.
