Hydraulic system fever for a short time, working device weakness. Hydraulic cylinder, hydraulic motor is the final implementation of hydraulic components, which caused by fever is relatively easy to judge. In most cases, hydraulic cylinders are mostly used for open circuits; hydraulic motors are often used for closed circuits; of course, exceptions are not uncommon, and the failure of these final actuators is easy to determine. Why is it difficult to judge in many cases? This involves the basic principles of hydraulic. First of all: There are many systems that use variable displacement pumps. The purpose of using a variable pump is to prevent the system from overheating and overheating when the required work is done. In recent years, a large number of variable-speed hydraulic system pumps, people gradually realize that this problem is that variable-speed hydraulic pump servo variable body damage can also cause system fever, work components weakness, or system overload (causing the engine, the motor bored cars or even stop working ), So these failures need to be done to test the flow pressure characteristics of the variable displacement pump to determine if the variable characteristics will cause the car to be stalled, ie the engine is turned. Second: the variable displacement pump system in the valve or valve group of the internal leakage, the same will cause the system fever, work weak or overload, which is many maintenance personnel neglect or unexpected. Variable-displacement pump test is more convenient, but the hydraulic valve or valve group in the test bench to do more difficult, because each has its own unique hydraulic system, and the kind of highly integrated hydraulic valve Group is essentially the core technology of foreign companies, in order to decipher the difficulty of these technologies is quite large, so in the face of such failures I advocate to do variable pump and hydraulic valve joint test. Again: to solve the hydraulic system can not rely solely on stress testing to complete, we must use the data to speak. This requires that the amount of flow and leakage of data testing, or even to do dynamic data testing, if the eyes can see the damage, it is still relatively easy to solve, the problem is a problem can not see the problem is indeed very difficult , The above problems are just solutions that are hard to see. In addition, in addition to the hydraulic system outside the working organization sometimes can cause such failures. Such as the coagulation tanker reducer bearing damage.
