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How to Replace a 3.5 Inch Gas Cylinder in an Office Chair

Office chairs use a pneumatic cylinder to allow for height adjustment of the seat. Due to the pressurized gas used inside the cylinders, they cannot be repaired if they become damaged. Instead, you will need to replace them. Cylinders come in a wide variety of shapes and sizes, so double-check that you have the right part for your chair (see Resource section). Contact your chair's manufacturer for specifications on your specific model of gas cylinder.

Things You'll Need

  • Screwdrivers (Phillips and flat-head)
  • Hammer
  • Pipe wrench
  • Water-displacing spray lubrication (e.g., WD-40)
  • Newspaper
  • Paper towels
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Instructions

    • 1

      Flip the chair over so the casters are facing up. Pry up the clip with a flat-head screwdriver and slide it out. Remove the washer, then lift off the casters. Lift off the plastic housing over the pneumatic cylinder.

    • 2

      Spray water-displacing lubrication such as WD-40 around the cylinder as close to the seat of the chair as possible. Firmly strike the cylinder with a hammer from all four sides to provide space for the lubricant to work down into the mechanism. Wait five minutes.

    • 3

      Tighten a pipe wrench around the cylinder as close to the seat as possible. Alternate turning the cylinder clockwise and counterclockwise while lifting up and away from the seat. The cylinder is held in with tapered metal, not screw threads. Work it out like a cork from a bottle. Be firm and patient. Don't force the cylinder because you might break the mechanism in the chair. If you can't get enough grip with the cylinder attached to the seat, unscrew the mechanism from the bottom of the seat and use a bench vise or other clamp to hold the mechanism firmly as you twist out the cylinder.

    • 4

      Insert the tapered end of a new cylinder into the mechanism. Fit it snugly with your hands (no tools). Replace the plastic cover and the casters. Reinstall the washer and then slide the clip in place. Sit down on the chair several times to fully seat the cylinder. Press the lever to raise and lower the cylinder three or four times.

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Home Office Furniture
  1. How to Fix the Pneumatic Adjustment on an Office Chair
  2. How to Adjust the Tilt on an Office Chair
  3. How to Replace an Armrest on an Office Chair
  4. How do I Replace Office Wheels With Glides?
  5. How to Replace the Hydraulic Cylinder on a Computer Chair
  6. How to Fix the Gas Lift Seat Height Adjuster
  7. How to Repair an Office Chair Cylinder
  8. How to Replace a Woven Cane Seat in a Chair
  9. How to Replace Office Chair Casters
  10. How to Lower an Office Chair
  11. How to Repair an Office Chair
  12. How to Replace the Pneumatic Cylinder for an Office Chair

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