Wuhan Hydraulic Pump Repair _ Hydraulic Pump Repair _ Engineering Hydraulic Pump Repair

Wuhan hydraulic pump maintenanceThe causes of faults in mid blade pumps generally include: high noise, pressure oscillation, system pressure drop, no pressure, and high system oil temperature.

1. No pressure refers to the absence of pressure in the system when the vane pump is working. Firstly, check whether the vane pump is discharging hydraulic oil. If not, check whether the working direction of the oil pump is correct, whether the coupling connection between the motor and the vane pump is normal, whether the shaft positioning screw is tightened and working properly, and whether the blades cannot work properly due to the high viscosity of hydraulic oil; If hydraulic oil comes out, it proves that the pump is basically fine. The problem should be severe leakage of the control valve and failure of the total pressure valve (relief valve).

2. The reason for high system oil temperature: It should be due to the small size of the system pipeline, high pressure, and inadequate cooling system, which leads to trapped oil in the vane pump. This is reflected in the high oil temperature of the pump body and system. According to the actual situation, increase the system pipeline or reduce the pump displacement (replace the small displacement pump core), adjust the cooling system to increase the cooling effect.

3. Pressure oscillation: refers to the unstable pressure of the system during the operation of the vane pump. As long as there is no abnormal noise from the oil pump, it should be a problem with the total pressure valve (relief valve). The valve core of the total pressure valve should be checked for wear and whether there are foreign objects blocking the damping; If pressure oscillation is caused by wear of the pump core components, there will be abnormal noise during the operation of the oil pump

4. System pressure drop: refers to the situation where the blade pump can reach the predetermined pressure during operation, but the pressure gradually decreases, causing the system to malfunction. If this phenomenon occurs in a newly installed pump, it should be caused by leakage of the system's control valve or high oil temperature. If the above problems occur again after a period of use, it is necessary to check whether the upper and lower oil distribution plates are worn (very flat wear). If the gap between the upper and lower oil distribution plates is too large and the oil temperature is too high (unable to form a self sealing oil film), the leakage of the control valve will cause the system to drop pressure.

5. Poor oil absorption: A common malfunction of vane pumps is the wear and tear of the inner surface of the stator into wedge-shaped edges, which is mainly caused by poor oil absorption. The reason is that when the oil pump lacks oil suction, the pressure will fluctuate, and the effective contact between the top of the blade and the inner surface of the stator will intermittently detach and contact with the pressure changes. Frequent hard impacts cause the oil suction area of the stator to have edges like a jacket plate. There are several situations where oil suction is not smooth: the oil is too viscous (with a larger grade), the filter is clogged, the suction pipeline is too thin, and the oil level is too low (with insufficient oil volume).

6. Oil absorption leakage: In the process of installing a new oil pump, oil absorption leakage is also a common disease, which is characterized by loud noise, gurgling, cracking sound, and more obvious pressure. The oil in the fuel tank will foam after long-term operation. The main cause of air leakage is poor sealing of the oil pump inlet flange and pipeline.

To make a vane pump work hard for you, maintenance and proper use are essential. If you don't know how to use and protect it, it will only increase your costs. On the contrary, if you put in the effort, it can also make your production process less troublesome and more efficient.

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