Hydraulic cylinder disassembly and reassembly

Before the hydraulic cylinder is disassembled, the hydraulic circuit should be used to relieve pressure. Otherwise, when the oil pipe joint connected to the hydraulic cylinder is loosened, the high-pressure oil in the circuit will spray out quickly. When depressurizing the hydraulic circuit, loosen the handwheel or pressure regulating screw at the relief valve, etc., to unload the pressure oil, and then cut off the power or power source to stop the hydraulic device. When disassembling, prevent damage to the thread on the top of the piston rod and the oil port, the surface of the piston rod, and the inner wall of the cylinder barrel. In order to prevent slender parts such as piston rods from bending or deforming, you should use cushioned wooden support to balance them when placed. The disassembly must be carried out in order. Due to the different structures and sizes of various hydraulic cylinders, the disassembly sequence is also slightly different. Generally, drain the oil in the two chambers of the cylinder at first, then remove the cylinder head, and finally remove the piston and piston rod. When disassembling the cylinder head, use special tools for the key or the snap ring connected by the inner snap key, but prohibit to use of a flat shovel. For flange-type end caps, use screws to push out, but don’t hammer or hard pry. When the piston and piston rod is difficult to withdraw, don’t force them out but find out the reason before disassembly. Before and after disassembly, try to create conditions to prevent the parts of the hydraulic cylinder from being contaminated by surrounding dust and impurities. For example, to carry out the disassembly in a clean environment as much as possible. After disassembly, cover all the parts with plastic cloth, but not cotton cloth or other working cloth. After the hydraulic cylinder is disassembled, check carefully to determine which parts can continue to be used, which parts can be used after repair, and which parts must be replaced.

How to reassemble a hydraulic cylinder?

To properly install the sealing devices everywhere. After the piston and piston rod are assembled, try to measure their coaxially and straightness over the full length. After completing the assembly, there should be no sense of blocking and uneven resistance when the piston moves.

For more about hydraulic cylinder repair or design, please just feel free to contact lily by WhatsApp or Wechat at 8613964561246.