Why does your hydraulic system fail?
No matter how good the quality of accessories or equipment, when a certain number of years later, there will be such or such problems, hydraulic system failure is divided into a variety of circumstances, it is Xiaobian according to different circumstances for analysis and summary of solutions, a reference for you.
Check first:
1. Check the control valve. First wash the safety valve, check whether the valve core wear, such as wear should be replaced. If there is no change after the safety valve is installed, check the valve core wear, the clearance limit is generally 0.06mm, wear seriously, should be replaced.
2. Check the inner leakage of the boom cylinder. The easiest way is to raise the boom to see if there is a significant free fall. If the whereabouts is obvious, remove the cylinder inspection, seal ring if worn, should be replaced.
3. Measure the pressure of the hydraulic pump. If the pressure is low, then adjust, and the pressure is still not adjusted up, indicating that the hydraulic pump serious wear and tear.
The main reason why the boom can not be lifted is:
1, the selection of hydraulic components unreasonable
The specification of the boom cylinder is 70 / 40 non-standard series, and the seal is also nonstandard. The manufacturing cost is high and the seal replacement is inconvenient. Boom cylinder bore small, is bound to make the adjustment for high pressure system.
2. Serious wear of hydraulic pump
When the pump is running at low speed, the leakage is serious; when the pump is running at high speed, the pump pressure is slightly improved, but because of the wear and discharge of the pump, the volume efficiency is significantly decreased, it is difficult to achieve the rated pressure. The hydraulic pump for a long time, but also exacerbated the wear, oil temperature rise, resulting in hydraulic components wear and seals aging, damage, loss of sealing capacity, hydraulic oil deterioration, and finally led to failure.
3, the hydraulic system design is unreasonable
The control valve and the full hydraulic steering gear are connected in series with a single pump, and the setting pressure of the safety valve is 16MPa, while the rated working pressure of the hydraulic pump is also 16MPa. The hydraulic pump is often at full load or overload for a long time (high pressure) case, and system hydraulic impact, long-term oil, hydraulic oil pollution, increased pump wear, so pump pump shell burst (after he was found such failure).
Improvement and effect
(L) improvement of hydraulic system design. After many demonstrations, the advanced priority valve and load sensing fully hydraulic steering gear are adopted, as shown in figure 2. The new system will shift in accordance with the requirements, give priority to the distribution of traffic, regardless of load size, the level of the steering wheel speed can ensure adequate supply, the rest can all work equipment supply circuit, thereby eliminating the loop due to the excess oil as losses, improve system efficiency and reduce the work pressure of hydraulic pump.
(2) optimize the design of the boom cylinder and the hydraulic pump, reduce the system working pressure. Through the optimization calculation, the boom cylinder adopts the standard series 80 / 4. The displacement of the hydraulic pump is increased from 10ml/r to 14ml/r, and the system setting pressure is 14MPa, which meets the requirements of lifting force and speed of the boom cylinder.
(3) attention should be paid to proper use and maintenance of loaders, and regular addition or replacement of hydraulic oil during use
，保持液压油的清洁度，加强日常检查和维护。
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