Judgment of hydraulic system fault location based on foam condition in fluid

In practice, we have found that by observing whether there is foam in the oil out of the pump of the hydraulic oil pump, it can be judged that the agricultural implement cannot raise or upgrade the slow fault section and part, and the method is simple and reliable. The half-split hydraulic suspension system is illustrated below for example. Engage the hydraulic gear oil pump and start the engine to stabilize the engine speed below the medium speed. After 3-5 minutes of operation, gradually loosen the hydraulic oil pump outlet oil pipe joint nut with a wrench until the oil overflows from the outlet pipe nut gap. , Quickly observe the condition of the oil and immediately lock the nut. According to the observed oil condition, roughly estimate the possible fault location, and then do step-by-step inspection. (1) There is a lot of yellow foam overflow in the oil. This condition indicates that the fault may have occurred in the hydraulic circuit in the front section of the oil pump due to air entering the hydraulic system. (2) There is no foam in the oil, but the oil pressure is not great. This condition indicates that the fault may be in the hydraulic pump. (3) There is no foam in the outer stern oil, but the pressure is high, and there is a sound of dripping oil. This situation generally indicates that the oil pump and the oil pump in the previous section of the oil pump are working properly, and the fault is in the hydraulic oil circuit in the rear section of the oil pump.

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