Office Chair Leaking Black Oil

The leaking of black oil from an office chair is usually caused by the failure of the sealing system of the gas lift rod, resulting in the seepage of hydraulic oil or lubricating oil. Targeted treatment measures need to be taken according to the warranty period and the oil leakage situation.

Preliminary Troubleshooting Steps

1. Observe the Location and Extent of the Oil Leakage
   Check whether the oil stains are concentrated at the connection between the gas lift rod and the base or the seat, or whether they are seeping out over a large area along the surface of the rod. Use a mobile phone to take photos and record the initial state. If the oil leakage point is fixed and accompanied by poor lifting and lowering, it may be due to the aging or wear of the sealing ring (such as an O-ring). If there are obvious offset marks at the installation site, it may be due to improper alignment during installation, resulting in poor sealing. If there are scratches or dents on the rod, there may be physical damage.

2. Check the Lifting Function
   Try to adjust the height of the chair and observe whether the lifting process is smooth. If there is stuttering, weakness, or an inability to lock the height, it indicates that the hydraulic system has been damaged, and the chair should be stopped from being used immediately.

3. Clean and Observe After Standing Still
   Thoroughly dry the oil stains on the surface of the gas lift rod with a clean soft cloth. After letting it stand for half a day or overnight, check again for any new oil stains. If there is still oil leakage, it indicates that the sealing failure is relatively serious.

4. Investigate External Causes
   Review your usage habits to confirm whether the chair has been used overweight for a long time (usually, the weight limit of an office chair is 100-120 kg) or whether it has been subjected to severe impacts or tilting. These factors may accelerate the damage to the sealing system.

Treatment Path Selection

• Within the Warranty Period
  Immediately contact the official after-sales service of Deli, provide the purchase invoice, and clearly describe the oil leakage phenomenon and functional abnormalities. Make an appointment for on-site inspection and repair or replacement of the gas lift rod. Do not disassemble it yourself to avoid the risk of high-pressure nitrogen leakage or explosion due to improper operation.

• Outside the Warranty Period
  For safety reasons, you must stop using the chair immediately and replace the entire hydraulic rod with a new one. The gas lift rod of an office chair is a high-pressure sealed structure and is a disposable part that cannot be disassembled for repair. Continuing to use it may lead to lifting failure, an inability to lock the height, slow automatic sinking, and even accidents due to the loss of stability. When replacing, note the following:

  • It is strictly prohibited to drill, saw, heat, or attempt to disassemble the old gas lift rod. It is filled with high-pressure nitrogen, and improper operation may cause an explosion.
  • Use appropriate tools such as a large pipe wrench to ensure a stable operation.
  • When purchasing replacement parts, pay attention to key parameters (such as stroke, diameter, and weight capacity) to ensure they match the original chair.
  • The replacement cost is usually relatively low, making it a safe and economical solution to completely solve the problem.