挖掘机在工作时无力的原因与维修技术

挖掘机在工作时无力的原因与维修技术

Reason and maintenance technology of excavator at work powerless

1发动机功率足够，运转正常，而挖掘机作业速度缓慢，挖掘无力。

1 engine power is sufficient, in normal operation, while the excavator is slow, weak mining.

2挖掘机的液压泵多为变量柱塞泵，工作一定时间以后，泵内部零件不可避免的产生磨损，造成内 漏，各参数数据不协调，导致流量不足、油温过高，速度缓慢，不能建立起高压，所以动作 缓慢无力。对于这类问题须卸下液压泵进行数据测量，确认问 题所在，更换不能继续使用的配件，或修复可一己续使用的配件，重新组装后上校验台调试，匹配各 回路参数(压力、流量、功率及变量等)。

The hydraulic pump 2 excavator multi variable piston pump, some time later, inevitably produce wear parts inside the pump, resulting in leakage, the parameter data is not harmonious, resulting in insufficient flow, high oil temperature, slow speed, cannot build up high, so slow to. For this kind of problem must remove the hydraulic pump to measure data, confirm the problem, can not continue to use the replacement of parts, or repair their continued use of accessories, re assembled after the test bench, the Colonel debugging, the circuit parameters (pressure, flow, power and variable etc.).

3挖掘机上一个重要液压元件－多路分配阀，上面有主安全阀、二次阀、溢流阀、补油阀等。若这 些阀所设定的压力达不到标准压力则导致挖掘无力。另外，若阀杆与阀孔之间因为磨损而间隙过大， 阀杆回位不完全、换向不到位，则大量内漏，导致流量不足，速度缓慢。此类问题，应当卸下多路分 配阀，送到实验台进行调试，重新设定所有阀的压力至标准压力，消除阀杆与阀孔之间的间隙即可。

An important assignment of hydraulic components multi valve 3 excavator, above the main safety valve, two valve, relief valve, oil supply valve etc.. If the valve set pressure not up to standard pressure leads to mining weakness. In addition, if the valve stem and valve hole between the gap is too large because of wear, the stem return incomplete, change is not in place, a large amount of internal leakage, resulting in insufficient traffic, slow speed. This kind of problem, should remove the multi-channel distribution valve to the experimental platform for debugging, re set the pressure to all standard valve, can eliminate the gap between the valve stem and valve hole.

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