译文：
一台PC200-6型全液压挖掘机在启动后，工作装置可实现各种动作，但主泵却发出了异常噪声。 　　初步分析，认为是泵吸空或者是油路中混入了空气所致。故先将工作装置调整至油位检测位置，检查发现液压油箱的油位处于油标的低位以下，属缺油的位置。经询问驾驶员知，通向斗杆缸无杆腔的高压油管的密封圈在工作中因漏油而更换过，但更换后没有及时检查油位。于是，首先给液压油箱加油至标准油位，试机表明异常噪声虽有所降低，但仍然存在;然后，通过主泵排气阀对主泵进行排气后重新试机，发现异常噪声还是存在，说明此噪声不可能xx是由泵吸空而引起的。 　　接下来，对液压油箱的吸油滤芯和回油滤芯均进行了检查，发现吸油滤芯变黑、有油泥，而回油滤芯上粘有褐色金属颗粒，为此更换了上述滤芯;考虑到回油滤芯上粘有褐色的金属颗粒，于是将主泵的油液放出并进行了检查，发现也有褐色的金属颗粒;同时，解体检查主泵时发现，活塞、配流盘、斜盘等无损坏现象，而滑履产生了磨损。将其更换后，严格按要求进行了装配，清洗了液压系统并换油，当再次启动试机时，异常噪声消失，故障已被排除。 　　通常情况下，主泵周围产生异常噪声的可能原因如下： 　　液压油不够造成主泵吸空;吸油管路中混入了空气;吸油滤芯堵塞导致主泵吸空;主泵内部磨损，致使主泵工作出现异常噪声。 　　本例中异常噪声是由于液压油不够和主泵内滑履磨损两方面的原因噪声的。其原因是：更换密封件后没有及时检查油位，导致液压油不够，使主泵产生吸空现象;混入空气的油液流经主泵时，滑履在某些瞬间浮不起来或浮起不充分，导致滑履与斜盘之间不能形成良好的润滑油膜，使滑履磨损，最终引起主泵工作产生异常噪声。

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原文：
A PC200-6-type hydraulic excavator start, the working device can achieve a variety of moves, but the main pump has issued a abnormal noise. A preliminary analysis that is pumping air or asphalt mixes the air. Therefore, first working device to adjust to the oil level detection of position, examination revealed hydraulic oil tank located at the subject of low oil below are short of oil position. Upon inquiry, the driver's knowledge, leading to Stick Rodless cylinder high-pressure pipeline of the ring cavity due to oil spills in the work of changing over, but the replacement did not check the oil level in time. So, first of all to the standard fuel tank to the hydraulic oil level, test machine showed that despite the abnormal noise reduction, but still exist; and then through the main pump exhaust valve to the main pump exhaust and re-test machines, there is still abnormal noise , indicating that this noise can not be completely empty by the pump suction caused. Next, the hydraulic tank and return the oil filter Oil filters were inspected and found black oil-absorbing filter, there is sludge, while the return to the oil filter on a stick with brown metal particles, for which the above-mentioned filter replacement; Taking into account the oil filter back on the sticky brown metal particles and, therefore, the main pump of the oil release and conduct an inspection and found that there are brown metal particles; the same time, the disintegration of inspection found that the main pump, piston, valve plate, inclined plate so no damage phenomena, rather than sliding shoes had worn. Its replacement, in strict accordance with the requirements of the assembly, cleaning the hydraulic system and oil change, when the re-start the test machine, abnormal noise disappeared, trouble has been ruled out. Under normal circumstances, the main pump around the creation of abnormal noise may be the following reasons: Result of a lack of hydraulic oil main pump suction air; Oil pipeline contains a mix of air; Oil filter blockage causes the main pump suction air; main pump internal wear and tear, resulting in abnormal noise, the work of the main pump. Exception in this case the noise is due to inadequate and the main pump hydraulic fluid within the sliding shoe wear two reasons for the noise. The reason is: replace the seals after the failure to make timely check the oil level, causing hydraulic oil is not enough to generate the main pump suction air phenomena; mixed with air, oil flows through the main pump, the sliding shoe floating in some moments, or the failure to float inadequate, resulting in between the sliding shoe and the inclined plate can not form a good lubricating oil film, so that sliding shoe wear and tear, the final work of the main pump causing abnormal noise.