Hydraulic cylinder It is the actuating element in a hydraulic transmission system. It is an energy‑conversion device that transforms hydraulic energy into mechanical energy. When used to produce reciprocating motion, it can eliminate the need for a speed‑reducing mechanism, features zero transmission backlash, and delivers smooth operation. Consequently, it is widely employed in various mechanical hydraulic systems.

　　 Hydraulic cylinder Installation Precautions

　　1. The hydraulic cylinder and its surrounding environment shall be kept clean. The oil tank must be sealed to prevent contamination. Piping and the oil tank should be cleaned to remove iron oxide scale and other foreign matter.

　　Clean with a lint-free cloth or dedicated cleaning paper. Do not use hemp thread or adhesives as sealing materials. Hydraulic oil must be selected in accordance with the design specifications; monitor changes in oil temperature and pressure. With the system unloaded, unscrew the bleed screw to vent air.

　　2. There shall be no looseness at pipe joints.

　　3. The base of the hydraulic cylinder must have sufficient rigidity; otherwise, during pressurization, the cylinder barrel will bow upward, leading to bending of the piston rod.

　　4. Before installing the hydraulic cylinder into the system, please compare the parameters on the cylinder’s nameplate with those specified in your order.

　　5. The central axis of a pneumatic cylinder with a fixed base should be concentric with the centerline of the load force to prevent lateral forces, which can lead to seal wear and piston damage.

　　When installing a hydraulic cylinder for a moving object, ensure that the cylinder and the moving object are aligned parallel to the guide rail surface and in the direction of motion, with a parallelism tolerance typically not exceeding 0.05 mm/m.

　　6. Install the sealing gland screws on the hydraulic cylinder body, ensuring they are tightened to the proper torque to guarantee smooth, unobstructed piston movement throughout its entire stroke and prevent uneven loading. Over-tightening increases friction and accelerates wear; under-tightening can lead to oil leakage.

　　7. For hydraulic cylinders equipped with an air bleed valve or an air bleed seat, the air bleed valve or seat must be installed at the highest point to facilitate air venting.

　　8. The axial ends of the cylinder must not be rigidly fixed; one end must remain floating to accommodate thermal expansion. Due to hydraulic pressure within the cylinder and thermal expansion, axial expansion and contraction occur. If both ends of the cylinder are fixed, all sections of the cylinder will deform.