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Excavator main pump abnormal noise exclusion
Excavator main pump abnormal noise ruled out a preliminary analysis that the pump is empty or oil mixed with air caused by. Therefore, first adjust the working device to the oil level detection position, check the hydraulic oil tank found in the oil level below the low, is a lack of oil position. Upon inquiry, the driver knows that the sealing ring of the high-pressure tubing leading to the rodless cylinder cavity of the arm cylinder has been replaced due to oil leakage during the work, but the oil level has not been checked in time after the replacement. So, first of all, to the hydraulic tank refueling to the standard oil level, the test machine showed abnormal noise, although reduced, but still exists; then, after the main pump exhaust valve to vent the main re-test machine and found that abnormal noise exists , Indicating that this noise can not be completely caused by the pump suction empty. Next, the hydraulic oil tank suction filter and return filter were checked and found that the suction filter black, sludge, and the back of the filter stuck with brown metal particles, for which the replacement of the filter; taking into account the oil filter On the sticky brown metal particles, so the main pump oil released and checked and found that there are brown metal particles; the same time, disintegration check the main pump found that the piston, with flow plate, swashplate and other non-destructive phenomenon, and Slides produce wear. After its replacement, the assembly was carried out strictly according to the requirements, the hydraulic system was cleaned and the oil was changed. When the testing machine was started again, the abnormal noise disappeared and the fault was eliminated. Under normal circumstances, the main reason for abnormal noise around the main pump excavator are as follows: hydraulic oil is not enough to cause the main pump suction air; suction pipe mixed with air; suction filter plug causes the main pump suction; internal pump wear, resulting in the Lord Abnormal noise pump work. In this case excavator main pump abnormal noise is due to insufficient hydraulic oil and the main pump wear two reasons slippery noise. The reason is: do not check the oil level after replacing the seal, resulting in insufficient hydraulic oil to make the main pump produce suction phenomenon; when the oil mixed with air flows through the main pump, the shoe can not float or float at some instant Insufficient, resulting in sliding between the swash plate can not form a good lubricant film, so that the wear of the slide, eventually leading to abnormal noise generated by the work of the main pump.