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 still no change after installation of safety valve, and then check the control valve spool wear, the gap limit of use is generally 0.06mm, severe wear and tear should be replaced;
3. Measure 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 main reason causing the hydraulic pump boom to not lift can be as follows:
a. Hydraulic pump is severely worn. 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 prolonged work and aggravated the wear and tear, increased oil temperature, resulting in wear and tear of hydraulic components and seals aging, damage, loss of sealing ability, hydraulic oil deterioration, and finally lead to failure;
b. hydraulic components selection is not reasonable. 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 guarantee sufficient oil supply, the remaining part Can all be supplied to the working device circuit, thereby eliminating the power loss caused by too much oil supply to the steering circuit, improving the system efficiency and reducing the working pressure of the hydraulic pump;
2. Optimization design boom cylinder and hydraulic pump shape, reduce system 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 proper use and maintenance of the loader hydraulic pump, regularly add or replace hydraulic oil, to maintain the cleanliness of the hydraulic oil, to enhance routine inspection and maintenance.
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