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　  Maintenance and upkeep of hydraulic cylinders, especially the hydraulic medium and cylinder blocks. Hydraulic transmission has many advantages, such as simple structure, stable quality, high mechanical efficiency, and easy automation. Therefore, many large-scale site maintenance and heavy machinery currently use hydraulic transmission systems, but hydraulic technology also has disadvantages such as oil leakage, oil temperature changes affecting the control of operating speed, and noise. According to the system pressure, operating speed, working oil, and ambient temperature, appropriately selecting, reasonably using, and maintaining hydraulic oil to maintain the good working performance of the oil for a long time and achieve optimal performance is the core of the work. To this end, hydraulic cylinders should be operated according to specifications and scientifically managed on a daily basis.

　　I. Maintenance and Upkeep Steps/Methods for Hydraulic Cylinders

　　(1) Regularly replace the hydraulic oil during the use of the oil barrel, clean the system filter to ensure cleanliness, and extend the service life.

　　(2) Each time the hydraulic cylinder is used, conduct five full extension test runs before transportation and operation. This can exhaust air from the system, preheat the various systems, effectively preventing the presence of air or water in the system and causing gas explosion (or coking) of the cylinder block, damaging the seals, and causing internal cylinder discharge failures.

　　(3) Adjust the system temperature. If the oil temperature is too high, the life of the seal will be shortened. If the oil temperature is high for a long time, the seal will deform or completely fail.

　　(4) Protect the outer surface of the piston rod to prevent collisions and scratches from damaging the seals. Regularly clean the dust ring of the dynamic seal of the cylinder and the sand on the exposed piston rod. Prevent difficult-to-clean dirt attached to the surface of the piston rod from entering the cylinder interior and damaging the piston, cylinder, or seals.

　　(5) Regularly check all threaded connections, bolts, etc., and tighten any loose parts immediately.

　　(6) Regularly lubricate connecting parts to prevent rust or abnormal wear in an oil-free state.

　　II. Precautions for Maintenance and Upkeep of Hydraulic Cylinders

　　According to the system pressure, operating speed, working oil, and ambient temperature, appropriately selecting, reasonably using, and maintaining hydraulic oil to maintain the good working performance of the oil for a long time and achieve optimal performance is the core of the work. To this end, daily operations should follow specifications and be scientifically managed.

　　III. Hydraulic Transmission Principle of Hydraulic Cylinders

　　Using oil as the working medium, motion is transmitted through changes in closed volume, and power is transmitted through the pressure inside the hydraulic cylinder.

　　Power: Converts the mechanical energy of the prime mover into the pressure energy (hydraulic energy) of the oil.

　　Execution: Converts the oil pressure input to the hydraulic pump into mechanical energy to drive the working mechanism.

　　Control: Used to control and adjust the pressure, flow, and flow direction of the oil.

　　Auxiliary: Connects the previous three parts to form a system that performs functions such as oil storage, filtration, measurement, and sealing.