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Komatsu Excavator Repair

Elimination of abnormal noise of main pump of Komatsu excavator

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After starting a PC200 full hydraulic excavator, the working device can realize various actions, but the main pump makes abnormal noise. According to preliminary analysis, it is thought that the pump is evacuated or air is mixed in the oil circuit. Therefore, first adjust the working device to the oil level detection position, and check that the oil level of the hydraulic oil tank is below the low level of the oil mark, which is a position where there is a lack of oil. After inquiring the driver, the seal ring of the high-pressure oil pipe leading to the rodless cavity of the stick cylinder was replaced due to oil leakage during work, but the oil level was not checked in time after the replacement.
Therefore, first fill the hydraulic oil tank to the standard oil level. The test machine shows that although the abnormal noise has been reduced, it still exists; then, after the main pump is exhausted through the main pump exhaust valve, the machine is retested and it is found that the abnormal noise still exists. , Indicating that this noise is impossible (maybe) caused by the pump suction. Repairing the excavator regularly cleans the vehicle of the excavator, inspects and lubricates the components, and replaces and repairs damaged parts. The main purpose is to effectively ensure the working effect and good technical status of the excavator to avoid the occurrence of zero Failures caused by component wear provide a good guarantee for people's safety. The structural principle, disassembly and installation methods, fault diagnosis and elimination methods of maintenance excavator , especially the general and typical fault diagnosis, elimination methods and disassembly of excavator parts are introduced in detail. Next, the oil suction filter and the oil return filter of the hydraulic oil tank were inspected. It was found that the oil suction filter became black and sludge, and brown metal particles were stuck on the oil return filter. Therefore, the above-mentioned filter was replaced. Considering the oil return filter Brown metal particles were stuck on it, so the oil of the main pump was discharged and inspected, and brown metal particles were also found;
At the same time, when disassembling and inspecting the main pump, it was found that there was no damage to the piston, the distribution plate, the swash plate, etc., and the sliding shoes were worn. Excavator repair refers to the technical activities performed to restore the function of the equipment after its technical condition deteriorates or fails, including various planned repairs and unplanned fault repairs and accident repairs. Realizing one-stop high-quality service of maintenance and quality inspection through a complete service chain can help enterprises establish a good brand image and then achieve a good promotion of industrial development. After replacing it, it was assembled in strict accordance with the requirements, the hydraulic systems were cleaned and the oil was changed. When the test machine was started again, the abnormal noise disappeared and the fault was removed. Under normal circumstances, the possible causes of abnormal noise around the main pump are as follows: insufficient hydraulic oil causes the main pump to evacuate; air is mixed in the suction line; oil filter (Filter material: glass fiber filter paper, chemical fiber filter paper) Etc.) The blockage causes the main pump to be evacuated; the internal wear of the main pump causes abnormal noise to the main pump.
The abnormal noise in this example is due to the lack of hydraulic oil and the wear of the shoes inside the main pump. The reason is that the oil level is not checked in time after the seals are replaced, resulting in insufficient hydraulic oil, which causes the main pump to have a suction phenomenon; when the oil liquid mixed with air flows through the main pump, the slipper cannot float or float at some instants. Insufficient results in the formation of a good lubricating oil film between the shoes and the swash plate, which causes the shoes to wear and cause abnormal noise in the main pump operation.
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