Office Chair Descending Issues

The most common reasons for an office chair to keep descending are the failure of the internal seal in the gas lift, leading to slow air leakage, followed by improper operation or issues with the locking mechanism. Here are the specific causes and solutions:

1. Gas Lift Aging and Pressure Loss
   As a consumable part, the gas lift's internal seals gradually age after repeated lifting and lowering, causing high-pressure gas to slowly leak and weakening the locking ability, resulting in the chair slowly descending. If the gas lift shows signs of oil leakage, unusual noises, or significant looseness, it should be immediately stopped from use and replaced. Do not continue using it to avoid danger.

2. Seal Wear Leading to Air Leakage
   The gas lift has multiple layers of sealing structures. Dust, moisture, and aged lubricant entering the interior can degrade the sealing performance, causing micro-leaks and preventing locking. Check the gas lift for oil leakage or unusual noises. If such issues exist, replace the gas lift; if there is no obvious damage, try cleaning the surface of the gas lift and applying specialized lubricant to see if the situation improves.

3. Adjusting Rod Continuously Pressing the Valve
   The metal rod connecting the adjusting handle and the gas lift under the chair may continuously press the pin, keeping the valve in a semi-open state if its installation position is offset, screws are loose, or plastic parts are worn, causing the chair to slowly descend continuously. Check whether the installation position of the adjusting rod is correct, whether the screws are loose, and whether the plastic parts are worn, and make corresponding adjustments or replacements.

4. Base Mechanism Deformation
   Prolonged overweight use or violent impacts to the chair may cause slight deformation of the base steel plate, affecting the lifting function. Check whether the base has obvious deformation or damage. If such issues exist, replace the base or the entire chair.

5. Operational and Environmental Factors
   To raise a pneumatic lifting chair, it should be unoccupied (the person leaves or lightly lifts the seat); to lower it, it should be weighted (the person sits on it). An uneven floor may cause the chair to be unevenly stressed, affecting the lifting function. Ensure correct operation and check whether the floor is level. Adjust the chair's position if necessary.

6. Loose Screws and Bolts
   Loose screws and bolts at the connections of the base, five-star foot, armrests, etc., may also cause the chair to descend. Check whether all connecting screws and bolts are tightened and make corresponding adjustments.

7. Locking Mechanism Issues
   Some chairs have a locking knob at the bottom of the gas lift or beside the adjusting handle. If accidentally tightened, it can lock the lifting function; if overtightened, it may also affect normal use. Check whether the locking knob is in the correct position and make corresponding adjustments.

8. Seat Installation Issues
   For models where the seat can be separated from the base, if the seat is not installed properly or the buckles are not locked, the chair may also descend. Check whether the seat is installed properly and whether the buckles are locked, and make corresponding adjustments.