Office Chair Wobbling Instability

Office chair wobbling instability can be caused by various factors and requires troubleshooting based on the specific situation.

1. Hydraulic rod issues
   If the connection between the seat and the base is loose, the lifting is jerky, and there are black oil stains on the rod, it may be due to a damaged hydraulic rod caused by air leakage from the seal ring. It is recommended to directly replace hydraulic rods that have been in use for more than five years. Do not disassemble them yourself to avoid the risk of explosion. When replacing, choose a compatible model and have it done by a professional.

2. Loose screws
   After long-term use, the screws and bolts at the connection between the seat surface and the chair legs may become loose due to vibration. If you hear a creaking sound when wobbling or there are gaps at the connections, check the screws on the five-star base, chassis, and other parts. Use a screwdriver to tighten all visible connectors one by one, being careful not to over-tighten and cause the screws to strip.

3. Caster issues
   Hair, fibers, and other debris getting tangled in the casters, or the wheels being suspended (such as getting stuck at the edge of a carpet), can cause the chair to wobble. Clean out any foreign objects from the gaps in the casters and ensure that all wheels can rotate freely. If the wheels are damaged, replace them with casters of the same specification.

4. Uneven floor
   Tile joints, sunken wooden floors, or soft floor mats may prevent all four legs of the chair from touching the ground simultaneously. Move the chair to a flat, hard surface for testing. If the wobbling stops, you can solve the problem by adjusting the chair's position or adding adjustable foot pads.

5. Inconsistent leg lengths
   Production errors or long-term uneven stress may cause wear on one side of the legs of wooden or old chairs, resulting in the chair always leaning to one side. Use a ruler to measure the lengths of the four legs. If there is a significant difference, contact the manufacturer for repair or replacement of the chair legs.

6. Worn foot pads
   When the rubber or plastic foot pads fall off or are worn, the chair legs directly contact the ground, making them prone to slipping and wobbling. Check the condition of the foot pads at the bottom of the chair. If they are missing or damaged, replace them with foot pads of the same material to increase friction and stability.

7. Damaged frame structure
   Solid wood chairs with mortise-and-tenon joints may experience loose or cracked tenons due to long-term stress. Observe if the chair feels 'soft' or leans to one side. If so, contact a professional carpenter to reinforce the mortise-and-tenon joints to prevent further damage.

8. Material issues
   If the user weighs more than 100 kilograms or the chair is inexpensive (such as costing two or three hundred yuan), the wobbling may be due to insufficient material strength. Choose a chair with a higher weight capacity (such as one rated for more than 120 kilograms) and avoid prolonged overloading.