Volkswagen models steering pump abnormal sound fault troubleshooting

A Shanghai Santana (Gallery Forum) GLI sedan, a total of 122,000 km drive, the engine idling, steering booster pump issued a "buzzing" sound, when the steering wheel when turning around when the abnormal noise aggravate. The car replaced two steering booster pumps in a month, replaced the first steering booster pump with about 20 days of noise, and the second one took only seven days. The same problem occurred again. According to maintenance technicians, they purchase channels formal, this accessory has sold more than one, have not had a similar problem. After demolition of the pump has been replaced, found no abnormal wear and tear. The car parked on a flat road, through a comprehensive visual inspection found that hydraulic lines, pump body and the direction of no oil leakage, the hydraulic oil storage tank between the upper and lower limits, the drive belt is tight and moderate, but the hydraulic oil Black has deterioration (Figure 1). Found through the test, turn the steering wheel left and right, turn normal afterburner, steering steady and flexible in the absence of steering deviation, heavy and floating phenomenon, and the steering back to good. Is it really caused by abnormal wear and tear of the pump noise? According to the owner to replace the new pump, the lack of oil spill has never been found. This pump is only used less than 10 days, should not be caused by wear and tear inside the pump. If the pump pressure valve and the flow valve is not good, will make the pressure is too low, the performance turned heavy; if the pressure is too high, due to excessive pressure around the power cylinder, driving direction deviation occurs automatically; if the steering distribution Poor valve operation or internal leakage, there will be heavy steering; if the steering valve disturbs the distribution will lead to poor steering back to bit; if the distribution valve spool and valve sleeve gap with poor, deviation and drift will occur phenomenon. After the above test and analysis, apparently does not meet any of the above situations, it seems that all parts of the steering system work well, but there is no bad wear and tear.

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