The hydraulic pump is an excavator component of the excavator hydraulic system. Once the hydraulic pump breaks down, the excavator will not work normally. What are the common faults of the excavator hydraulic pump? The excavator maintenance master will show you.
First, most of the common faults of gear pump are caused by the wear of its internal friction pair. Its normal wear increases the radial clearance and axial clearance (i.e. section clearance), and the leakage phenomenon in the gear pump is aggravated. In serious cases, the holes in the pump body or the plates on both sides cannot be repaired. In addition, the shaft seal is often damaged.
Second, vane pump is different from gear pump, its normal wear is very small, and the service life of parts is long. The main cause of vane pump failure is oil pollution, which is because the moving pair of vane pump is closely matched, and when pollutants enter the friction pair, it is easy to produce abnormal stagnation or wear. In addition, the self-priming performance of vane pump is not as good as that of gear pump, especially the vane pump with small displacement. Therefore, whether the oil is clean and whether the oil suction is smooth are two issues that need special attention in the operation of vane pump.
Thirdly, the weakness of the radial piston pump in the structure and motion performance is that the radial force is large, the self-priming ability is poor, and the matching accuracy between the plunger and the plunger hole is high; The machining accuracy of parts of axial piston pump is required to be high. Therefore, piston pump requires high cleanliness of oil, that is, piston pump requires higher filtration accuracy of oil than gear pump.
Correctly analyzing the causes of excavator failures and dealing with them in time, and strengthening the maintenance of excavators are the premise to ensure the efficient and safe work of excavators, which should be paid full attention to in practical work.
