Elimination of abnormal noise of excavator main pu

2022-06-23
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Elimination of abnormal noise of excavator main pump preliminary analysis shows that the pump is empty or air is mixed in the oil circuit. Therefore, first adjust the working device to the oil level detection position, and it is found that the oil level of the hydraulic oil tank is below the low level where the oil level indicator changes, which is the position of oil shortage. The driver was informed that the sealing ring of the high-pressure oil pipe leading to the non rod chamber of the stick cylinder was replaced due to oil leakage during operation, but the oil level was not checked in time after replacement. Therefore, firstly, fill the hydraulic oil tank to the standard oil level, and the test machine shows that under the concerted efforts of all member units, the common noise of the XPS special committee has decreased, but it still exists; Then, after exhausting the main pump through the exhaust valve of the main pump, it was found that the abnormal noise still existed, indicating that the noise could not be completely caused by the empty pump

then, even in key construction projects, the oil suction filter element and oil return filter element of the hydraulic oil tank were inspected. It was found that the oil suction filter element was black and there was oil sludge, while there were brown metal particles on the oil return filter element. Therefore, the above filter element was replaced; Considering that there are brown metal particles on the oil return filter element, the oil of the main pump was discharged and checked, and it was found that there are also brown metal particles; At the same time, during disassembly and inspection of the main pump, it was found that the piston, valve plate, swashplate, etc. were not damaged, while the sliding shoes were worn. After replacement, it was assembled in strict accordance with the requirements, the hydraulic system was cleaned and the oil was changed. When the test run was started again, the abnormal noise disappeared and the fault was eliminated

under normal circumstances, the possible causes of abnormal noise around the main pump are as follows:

the main pump is empty due to insufficient hydraulic oil; Air is mixed in the oil suction pipe; The oil suction filter element is blocked, causing the main pump to empty; The internal wear of the main pump causes abnormal noise during the operation of the main pump

the abnormal noise in this case is caused by insufficient hydraulic oil and wear of sliding shoes in the main pump. The reason is that the oil level was not checked in time after the seal was replaced, resulting in insufficient hydraulic oil and empty suction of the main pump; When the oil mixed with air flows through the main pump, the slipper cannot float or does not float sufficiently at some moments, resulting in the failure to form a good lubricating oil film between the slipper and the swashplate, causing the slipper to wear, and finally causing abnormal noise during the operation of the main pump

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