我部一台小松PC650－5型正铲挖掘机,使用中因发现主液压泵端面漏油,立即停机处理漏油故障。停机前,机器的一切动作正常。在更换了必要的油封件后试机时发现:机器各动作缓慢、不稳定,存在较大的液压冲击,在上转台回转时尤为明显。为此,进行了多次液压调试,却均未奏效,且 I Komatsu PC650-5 a front shovel excavator, the use of oil leaks found in the end of the main hydraulic pump, immediately shut down to handle oil spills. Before shutting down, all the machine’s movements are normal. After the replacement of the necessary seals after the test machine found: the machine movements are slow, unstable, there is a large hydraulic impact, particularly evident when turning on the turntable. To this end, carried out a number of hydraulic commissioning, but none worked, and