Whether it is a quasi new machine that has just been bought for more than half a year or an old machine that has been in use for years, it is not uncommon for the whole machine to move slowly and powerlessly from time to time in the aircraft industry. Of course, it is also the number one fault killer that troubles old drivers.
The root cause of this fault is very many, and finding the fault is also time-consuming and laborious. However, it is the most basic common knowledge to check the main relief pressure. Often, the main relief valve is stuck, which leads to pressure relief and insufficient relief pressure.
Fault analysis
The pressure of the main relief valve is not enough, and the internal valve core is worn and stuck. How to judge?
Fault judgment mode
Generally, the main overflow pressure of small excavators is between 23-28mpa, and that of medium excavators is mostly about 32-35mpa. The boosting pressure is 2-5mpa higher than this standard. Therefore, when we repair, we compare the measured data with this standard. If it is lower than this standard, we can check the main overflow valve according to the method in the video.
Fault handling
Treatment methods for problems found in the main relief valve:
First, disassemble for inspection and cleaning first, and then conduct test run after reinstallation to check whether the pressure can be restored to the normal value.
Second, if the normal value cannot be restored, we can also adjust the overflow pressure properly by adjusting the nut, and then check whether it can be raised to the normal value range.
Third, if the above two methods can not be recovered, that is, the internal valve core and other matching parts are damaged. If they can not be recovered, they can only be replaced.
summary
The failure of the hydraulic system is indeed a headache for everyone. On the one hand, friends are willing but not able to repair it themselves, but they are afraid of causing unnecessary damage to precision hydraulic parts.
However, I believe that through the brief introduction of this article, all friends can also understand that precision hydraulic parts such as the main relief valve are not to avoid snakes and scorpions, and they can also be easily solved by mastering skills.
