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What are the precautions for installing hydraulic cylinders during hydraulic pump maintenance, and how should they be properly maintained? I. Precautions for the installation of hydraulic cylinders 1. The hydraulic cylinder and its surrounding area should be kept clean. The fuel tank must be kept sealed to prevent contamination. The pipelines and fuel tank should be cleaned to prevent the presence of loose scale and other debris. Use a lint-free cloth or special paper for cleaning. Hemp thread and adhesive cannot be used as sealing materials. Follow the design requirements for hydraulic oil, and pay attention to changes in oil temperature and pressure. When idle, loosen the exhaust bolt to release exhaust gas. 2. The piping connections must not be loose. 3. The base of the hydraulic cylinder must have sufficient stiffness; otherwise, when pressure is applied, the cylinder barrel bends upward in an arch shape, causing the piston rod to bend as well. 4. Before installing the hydraulic cylinder in the system, compare the parameters on the cylinder’s label with those specified at the time of ordering. 5. For a mobile cylinder with its foot fixed, its central axis should be concentric with the line of action of the load force, in order to avoid the generation of lateral forces; such lateral forces can easily cause wear on the seals and damage to the piston. When installing the hydraulic cylinder for a moving object, it is necessary to ensure that the cylinder moves in parallel to the direction of motion of the object on the guide rail, with the degree of parallelism generally not exceeding 0.05 mm/m. 6. Install the sealing gland screws for the hydraulic cylinder block, tightening them to such a degree that the piston can move freely throughout its entire stroke, without any obstruction or uneven forces. Screws that are tightened too much increase resistance and accelerate wear; those that are too loose cause oil leakage. 7. In hydraulic cylinders equipped with exhaust valves or exhaust plugs, these must be installed at the highest point to allow air to be expelled. 8. The axial ends of the cylinder must not be fixed rigidly, and one end must remain free to move in order to account for thermal expansion. Due to factors such as hydraulic pressure and thermal expansion inside the cylinder, there is axial expansion and contraction. If both ends of the cylinder are fixed firmly, it will cause deformation in various parts of the cylinder. 9. The gap between the guide sleeve and the piston rod must meet the requirements. 10. Pay attention to the parallelism and straightness of the cylinder and the guide rails; the deviation should be within 0.1 millimeters over the total length. If the total length of the main busbar on the hydraulic cylinder is out of spec, the bottom surface of the cylinder’s bracket or the contact surface of the machine tool should be trimmed to meet the requirements; if the side busbar is out of spec, the hydraulic cylinder and its fixing screws can be loosened, the positioning lock removed, and the accuracy of the side busbar adjusted. 11. When disassembling or assembling hydraulic cylinders, be careful to avoid damaging the threads at the top of the piston rod, the threads on the cylinder port, and the surface of the piston rod. It is strictly prohibited to strike the cylinder barrel and piston surface with a hammer. If there are damages to the cylinder bore or piston surface, it is not allowed to use sandpaper for polishing; instead, fine emery stones should be used for careful grinding. 1. The hydraulic cylinder and its surrounding area must be kept clean. The fuel tank must be kept sealed to prevent contamination. The pipelines and fuel tank should be cleaned to prevent the presence of loose scale and other debris. Use a lint-free cloth or special paper for cleaning. Hemp thread and adhesive cannot be used as sealing materials. Follow the design requirements for hydraulic oil, and pay attention to changes in oil temperature and pressure. When idle, loosen the exhaust bolt to release exhaust gas. II. Proper maintenance First, during use, the hydraulic oil in the cylinder should be replaced regularly, and the system filters should be cleaned to maintain cleanliness and extend the service life. Second, each time the cylinder is used, it must be tested by moving it through 5 full extensions and retracts before being operated under load. Why is this done? It allows the air in the system to be removed and the various systems to be preheated, thereby effectively preventing the presence of air or water in the system from causing gas explosions (or scorching) within the cylinder body. Such situations can damage the seals and lead to issues such as oil leakage in the cylinder. Third, control the system temperature properly; high oil temperatures can reduce the service life of seals. Prolonged exposure to high oil temperatures can cause the seals to deform permanently or even become completely ineffective. Fourth, protect the outer surface of the piston rod to prevent damage to the seals caused by impacts and scratches. Regularly clean the dust seals on the moving parts of the cylinder as well as the exposed piston rod, in order to stop dirt that is difficult to remove from sticking to the piston rod surface and entering the cylinder, thereby avoiding damage to the piston, cylinder barrel, or seals. Fifth, regularly check all threaded and bolted connections; tighten them immediately if any loosening is detected. Sixth, regularly lubricate the connection points to prevent rusting or abnormal wear in the absence of oil.