In the operation of the excavator, the oil pump plays a vital role. It is like the heart of the entire equipment, providing power for the hydraulic system and ensuring that the excavator can perform various operations normally.
First, you can perform an appearance inspection. This step is intuitive and important. Carefully check whether the outer casing of the oil pump has obvious damage, cracks or signs of oil leakage. If oil leakage is found, it is likely that there is a problem with the seal of the oil pump. At the same time, check whether the connecting pipes of the oil pump are firm and whether there is looseness or leakage at the joints. For second-hand dealers, appearance inspection is the first step when acquiring a second-hand excavator. With their rich experience, they will quickly determine whether there is a problem with the appearance of the oil pump. If there is obvious damage or oil leakage, it is necessary to further evaluate the repair cost and the impact on the overall value of the equipment.
Pressure testing is also a key detection method. Use professional hydraulic testing equipment and connect it to the hydraulic system of the excavator. With the engine running, measure the output pressure of the oil pump. The pressure standards of oil pumps of different models of excavators will be different. At this time, you can refer to the user manual of the equipment or consult the manufacturer to obtain the accurate pressure value range. Then compare the actual measured pressure value with the standard pressure value. If the pressure is too low, it may be caused by internal wear, leakage or pressure regulating valve failure of the oil pump. If the pressure is too high, it may cause damage to other parts of the hydraulic system, and further inspection and troubleshooting are also required. Second-hand dealers usually carry professional testing equipment to conduct comprehensive pressure tests on the second-hand excavators they acquire. They can accurately judge the performance of the oil pump based on the test results, providing a basis for pricing and sales.
Flow testing is also not to be ignored. The flow test can determine whether the output flow of the oil pump is normal. Also use professional testing equipment to measure the output flow of the oil pump under specific working conditions. Compare with the standard flow value. If the flow is insufficient, it may affect the working efficiency of the excavator. The reason may be damage to the internal parts of the oil pump, blockage or poor suction pipeline. When testing the flow, second-hand dealers will combine the actual use of the excavator to evaluate the impact of insufficient flow on the performance of the equipment. If the problem is more serious, they may consider repairing or replacing the oil pump to improve the market competitiveness of the second-hand excavator.
Sound inspection is also an effective method. When the engine is running, listen carefully to the working sound of the oil pump. Under normal circumstances, the oil pump should make a smooth and uniform operating sound. If you hear abnormal noises, such as sharp cries, banging sounds, etc., it may be caused by wear, looseness, or foreign objects entering the internal parts of the oil pump. Second-hand dealers are very sensitive to sound, and they can preliminarily judge the health of the oil pump by listening to the sound. If there is abnormal noise, they will conduct further in-depth inspections to determine the root cause of the problem.
In short, testing the excavator oil pump is crucial to ensure the normal operation of the equipment. Second-hand dealers play an important role in this process. They use professional testing methods to accurately evaluate the status of the oil pump, provide customers with reliable second-hand excavators, and also promote the healthy development of the second-hand excavator market.