What should I pay attention to when disassembling the hydraulic cylinder?

Introduction

In the hydraulic system, the hydraulic cylinder is an indispensable key component, which converts hydraulic energy into mechanical energy and provides power for various mechanical equipment. However, in the process of maintenance, overhaul or replacement of hydraulic cylinders, disassembly is an indispensable link. The following are the matters that we need to pay attention to when disassembling hydraulic cylinders based on our experience.

Disassembly process and precautions

1. Before disassembly, the hydraulic circuit should be depressurized. Otherwise, when the oil pipe joint connected to the oil cylinder is loosened, the high-pressure oil in the circuit will spray out quickly. When depressurizing the hydraulic circuit, first loosen the handwheel or pressure regulating screw at the overflow valve, etc. to unload the pressure oil, and then cut off the power supply or power source to stop the hydraulic device.

2. When disassembling, prevent damage to the top thread of the piston rod, the oil port thread and the surface of the piston rod, the inner wall of the cylinder sleeve, etc. In order to prevent the bending or deformation of slender parts such as the piston rod, use wooden blocks to support balance when placing.

3. Complete the disassembly in sequence. The structures and sizes of various hydraulic cylinders are different, and the disassembly sequence is slightly different. However, it is generally necessary to disassemble in the order of draining oil, removing the cylinder head, and removing the piston or piston rod. When disassembling the cylinder head, special tools should be used for the key or snap ring of the internal key connection, and flat shovels are prohibited; for the flange end cover, it must be pushed out with screws, and hammering or hard prying is not allowed. When the piston and piston rod are difficult to pull out, find out the cause before disassembly, and do not force it out.

4. Before and after disassembly, prevent the parts of the hydraulic cylinder from being contaminated by surrounding dust and impurities. Disassembly should be carried out in a clean environment as much as possible. Cover all parts with plastic cloth after disassembly.

5. After disassembly, carefully check to determine the parts that can continue to be used, can be reused after repair, and must be replaced.

6. All parts must be carefully cleaned before reassembly.

7. Correctly install the sealing devices in various places: When installing the O-ring, do not pull it to the extent of permanent deformation, and do not roll it while installing it, otherwise it may leak oil due to the twisting shape. When installing Y-shaped and V-shaped sealing rings, pay attention to their installation direction to avoid oil leakage due to reverse installation. If the sealing device cooperates with the sliding surface, it should be coated with an appropriate amount of hydraulic oil during assembly. All O-rings and dust rings should be replaced after disassembly.

8. After the piston and piston rod are assembled, measure their coaxiality and straightness over the entire length to see if they are out of tolerance. 9. After assembly, there should be no sense of blockage and uneven resistance when the piston assembly moves.

10. When the hydraulic cylinder is installed on the main engine, a sealing ring must be added between the inlet and outlet joints and tightened to prevent oil leakage.

11. After assembly as required, several reciprocating movements should be performed under low pressure to remove the gas in the cylinder.

Conclusion

Disassembly of hydraulic cylinders is a highly technical job that requires strict compliance with correct procedures and methods. As a hydraulic cylinder manufacturer, we are well aware of the importance of every detail in the disassembly process. If you have any questions, please contact us and we will be happy to help you.