After a certain period of use of the hydraulic pump of the hydraulic press, the parts of the hydraulic pump will wear and damage, resulting in a decrease in the movement accuracy and working performance of the pump, and various abnormal phenomena such as the inability to push up the oil pressure, the oil supply decreases, the intensification of noise, and the increase in vibration. These imaginations are often a symptom of wear or damage to hydraulic pump parts. Once the parts of the hydraulic pump wear out and exceed the allowable deviation, they must be repaired and restored in time to make the hydraulic pump regain the accuracy and working performance. In some cases, skilled operators can easily improve the working performance of hydraulic pumps through excellent repair and assembly. Causes of hydraulic pump damage There are various reasons for the damage to hydraulic pump, but in its essence, there are mainly two types 1. The wear of wear hydraulic pump parts is the same as that of any equipment, and is the inevitable result of mechanical operation. Under normal use conditions, due to friction and chemical reaction

For four-column hydraulic presses, the viscosity of hydraulic oil has many great impacts on the working state of a machine. So, what impact does the viscosity of hydraulic oil have on the work of the hydraulic system? Viscosity is one of the most important performance indicators of hydraulic oil. Whether it is reasonable or not has a significant impact on the movement stability, working reliability and sensitivity of the hydraulic machine factory system, system efficiency, power consumption, cavitation phenomenon, temperature rise and wear. For example, when the viscosity of hydraulic oil is high, the flow resistance of the hydraulic oil will increase and the flow rate will slow down; and due to friction loss, the consumption of r power will increase; the pressure drop will be added to the valves and pipelines, thereby reducing the efficiency of the system, and the intensification of friction will increase the oil temperature and cause leakage. If the hydraulic viscosity is low, leakage loss will inevitably aggravate, and the oil film between the moving parts will rupture, and the wear of the guide parts will be accelerated. Four-column hydraulic press is in use