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原文：
一辆上海桑塔纳GLI轿车，累计行驶12.2万km，发动机在怠速运转时，转向助力泵发出“嗡嗡”响声，当左右转动转向盘时异响加重。该车在1个月内更换了2个转向助力泵，换上第1个转向助力泵时使用了约20天噪声便出现，第2个则只用了7天同样的问题便又出现。据维修技术人员介绍，他们进货渠道正规，此配件已售出多台，均未出现过类似问题。 　　经拆检已换的泵体，未发现异常磨损。将车停驶在平坦路面，通过全面的目视检查发现，液压管路、泵体及方向机无漏油现象，储液罐内液压油在上限与下限之间，传动带松紧适度，只是液压油呈黑色有变质现象。通过试车发现，左右转动转向盘，转向加力正常，在行驶中转向稳定且灵活，未出现转向时跑偏、沉重与发飘现象，且转向回位良好。 难道真的是泵内异常磨损产生的噪声？据车主讲换上新泵后，从未发现缺油漏油现象。而此泵只使用了不足10天，应不是泵内磨损所致。如果泵内压力阀与流量阀不良，将会使压力过低，表现为转向沉重；如果压力过高，会因动力缸左右压差过大，行驶中会出现方向自动跑偏现象；如果转向分配阀工作不良或内部泄漏，会出现转向沉重；如果转向分配阀卡滞，会导致转向回位不良；如果分配阀芯与阀套配合间隙不良，也会发生跑偏与发飘现象。经过以上测试与分析，显然不符合以上任何一种情况，看来转向系统各部件工作良好，更不存在不良磨损现象。

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译文：
A Shanghai Santana GLI sedan, total driving 122 000 km, the engine running at idle speed, power steering pump issue "buzzing" sound when turning left when the abnormal sound heavier steering wheel. Car in a month to replace the two power steering pump, replace the first one to use the power steering pump noise will occur about 20 days, the first two only spent 7 days there will certainly disclose the same problem. Maintenance technician, according to their regular purchasing channels, this accessory has sold more than one, there have been no similar problems. Dismantling the unit has changed the pump and found no abnormal wear. The car suspended on a flat surface, was found through a comprehensive visual inspection, hydraulic piping, pump and direction of the machine without leakage of hydraulic oil within the tank at the upper and lower limits, moderate elastic belt, but hydraulic oil there are bad with black. Through the test found that turning left and right steering wheel, steering afterburner normal shift in the driving stability and flexible, does not appear steering deviation, heavy with the phenomenon of waving, and turned back a good bit. Is it really true pump noise generated within the abnormal wear? According to car speakers replaced, after the new pump has never been found lacking fuel leakage. And this pump is only used less than 10 days, should not pump due to wear and tear. If the pump pressure valve and flow valve bad, will make the pressure too low, the performance of the steering heavy; If the pressure is too high, so because of power cylinder pressure is too large, driving directions will appear automatically deviation phenomenon; If the shift distribution working poor or the internal valve leakage, there will be a heavy shift; if shift distribution valve catching position will lead to turn back bad; if assigned with the spool and valve cover poor gap, deviation also occurs with the phenomenon of waving. After more testing and analysis, clearly does not meet any of the above case, it appears steering system components work well, but there is no bad abrasion.