The speed of Hitachi ZX360K-5A hydraulic cylinder cannot reach the specified adjustment value. What is the reason for this failure? In fact, there are many reasons that cause the speed of the hydraulic cylinder to fail to reach the specified adjustment value. The following is a brief description.
The speed of Hitachi ZX360K-5A hydraulic cylinder cannot reach the regulated value. Reasons:
1. Check whether the oil supply of the hydraulic pump is insufficient and the pressure is not enough: for example, the internal leakage of the pump due to the wear of the internal parts of the hydraulic pump, and the decrease in volumetric efficiency causes the relevant content of the flow decompression pump delivered to the cylinder by the pump to be excluded. Underspeed.
2. Check whether there is a large amount of oil leakage in the system: oil leakage includes external leakage and internal leakage. The external leakage is mainly due to the loosening of the pipe joints. The tightness of the pipe joints can be referred to the related seal damage in this book, especially the pipeline content in the invisible places in the fuel tank, to ensure that there is special attention; the internal leakage is mainly hydraulic components ( Pumps, valves, and enough flow are provided to the cylinders) The kinematic pair is broken down due to excessive wear clearance and possible hydraulic pressure in the system.
1. Check if the overflow valve is faulty: if the overflow valve spool card is rigidly connected to the open position, a large amount of oil will always overflow from the overflow valve to eliminate the overflow valve failure. The fuel tank will reduce the flow into the cylinder and the under-speed adjustment value (under-speed).
2. Check whether the two cavities (working cavity and oil return cavity) inside the oil cylinder refer to the above treatment. Cavity” should be eliminated slightly in the degree.
5. Check whether the underspeed is caused by the cylinder's awkwardness: This type of failure usually means that the speed of the cylinder decreases with different positions of the stroke, but the degree of the speed decrease varies with the stroke. Most of them can refer to the aforementioned reasons due to the poor assembly and installation quality of the other Jin. The non-operation of the other Jin's oil cylinder will increase the load of the oil cylinder and increase the working pressure. The internal leakage will be eliminated and the leakage will increase. The speed will decrease as much as possible.
