Fault phenomenon of hydraulic pump, reason analysis and improvement method

Abstract: Hydraulic pump failure phenomenon, reason analysis and improvement methods. First, the hydraulic pump failure phenomenon and analysis 1. Check the boom cylinder leakage situation. The easiest way is to raise the boom to see if there is a clear free fall. If the whereabouts of obvious removal of the fuel tank inspection, seals have been worn should be replaced; 2. Check the control valve. First clean the safety valve, check whether the spool wear, such as wear and tear should be replaced. If there is no change after the installation of safety valve, and then check the control valve spool wear, the gap limit of use is generally 0.06mm, serious wear and tear should be replaced; 3. Measurement of the pressure of the hydraulic pump. If the pressure is low, then make adjustments, the pressure is still not adjustable, the serious damage to the hydraulic pump. In general, the hydraulic pump caused by the boom can not lift the main reasons are: a. Hydraulic pump serious wear and tear. The pump leaks seriously at low speed. When the pump runs at high speed, the pump pressure slightly increases, but due to the pump wear and leakage, the volumetric efficiency drops significantly and it is difficult to reach the rated pressure. Hydraulic pump work for a long time has exacerbated the wear and tear, oil temperature rise, resulting in wear and tear of hydraulic components and seal aging, damage, loss of sealing ability, hydraulic oil deterioration, and finally lead to failure; b. Hydraulic components unreasonable selection . Boom cylinder specifications for 70/40 non-standard series, the seals are also non-standard parts, high manufacturing costs and seal replacement inconvenience. Boom cylinder bore is small, the system is bound to set high pressure; c. Hydraulic pump system design is not reasonable. As can be seen from Figure 1, the control valve and full hydraulic steering gear for a single pump in series, safety valve setting pressure points 16MPa, while the hydraulic pump rated working pressure is also 16MPa. Hydraulic pump often at full load or prolonged overload (high pressure) work, and the system has a hydraulic impact, long-term oil does not change, the hydraulic oil contaminated, exacerbating the hydraulic pump wear and tear, resulting in hydraulic pump shell burst (was found Such failure). Second, the hydraulic pump to improve and effect 1. Improve the hydraulic system design. After several demonstrations, the final use of advanced priority valve and load sensing hydraulic steering gear form, the new system can follow the steering requirements, give priority to the distribution of traffic, regardless of the size of the load, the steering wheel speed can ensure adequate oil supply, the remaining part Can be fully supplied to the working device circuit, thus eliminating the power loss caused by excessive oil supply to the steering circuit, improving the system efficiency and reducing the working pressure of the hydraulic pump. 2. Optimizing the design of the boom cylinder and the hydraulic pump and reducing the system Work pressure. Through optimization calculation, the boom cylinder adopts standard series 80/4. Hydraulic pump displacement increased from 10ml / r to 14ml / r, the system set pressure of 14MPa, to meet the boom cylinder lifting force and speed requirements; 3. In the course of the process should also pay attention to the correct use and maintenance of the loader hydraulic pump , Regular addition or replacement of hydraulic oil to maintain the cleanliness of the hydraulic oil to enhance routine inspection and maintenance.

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