Office Chair Hydraulic Rod

Maintenance of the office chair hydraulic rod requires targeted measures based on specific issues. Ensure the chair is stable before operation and seek professional help if necessary.

The office chair hydraulic rod (also known as the hydraulic cylinder) is the core component for adjusting the height. Common faults include inability to raise or lower, strange noises, sinking, and sticking. The maintenance steps are as follows:

I. Fault Diagnosis and Basic Handling

1. Inability to Raise or Lower: This is often due to poor sealing or a faulty control valve. Invert the chair, disassemble the connection between the hydraulic rod and the seat, and check if the sealing rubber ring is damaged. If damaged, replace it with a suitable rubber ring and reassemble. If the rubber ring is intact, clean any impurities from the control valve. If cleaning is ineffective, the valve may need to be replaced.
2. Strange Noises: This is usually caused by a lack of lubrication or loose components. Apply professional hydraulic oil or lubricating oil to the moving parts of the hydraulic rod and repeatedly raise and lower the chair to distribute the oil evenly. Use a wrench to tighten any loose screws to eliminate the noise.

II. Handling Special Issues

1. Insufficient Air Pressure: When the chair sinks or lacks support, locate the air inlet at the bottom (usually covered by a protective cap) and use a matching air pump to slowly inflate it. Keep the pressure within the range of 0.5 - 1.0 MPa, observing continuously to avoid bursting.
2. Internal Sticking: If there is significant resistance during adjustment and the chair does not move, it may be due to debris or rust at the connection. Invert the chair, unscrew the fixing screws between the chair leg and the base of the hydraulic rod, separate the components, and then hold the middle of the hydraulic rod with both hands and shake it left and right, or gently tap the edge of the connection with a rubber mallet to help loosen it. Spray lubricating oil on the surface and in the gaps, and then pull it a few times before reassembling and testing.
3. Aging Sealing Ring: If there are oil stains on the surface of the hydraulic rod, it indicates that the sealing ring is damaged and causing oil leakage. The hydraulic rod needs to be disassembled to replace the sealing ring. Be sure to clean any residual hydraulic oil inside during the operation.

III. Replacing the Hydraulic Rod
If the above methods are ineffective, it indicates severe internal damage, and the entire hydraulic rod needs to be replaced. Raise the chair to its highest position and gently tap to separate the seat from the wheel frame, allowing the old hydraulic rod to detach (lubricating oil can be applied to assist if there is resistance). Insert the new hydraulic rod into its original position, ensuring it is firmly installed (it may be loose initially but will tighten after a few uses). Finally, reattach the chair legs and base and tighten the screws.

Safety Tip: Always keep the chair stable during maintenance to avoid collapse and injury. If you lack experience or the fault is complex, it is advisable to contact a professional maintenance technician for handling.