Replacing The Herman Miller Aeron Chair Top Activated Gas Cylinder

Replacing The Herman Miller Aeron Chair Top Activated Gas Cylinder

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How to Replace the Cylinder on Your Aeron Chair: A Step-by-Step Tutorial

Replacing the cylinder on your Aeron chair can rejuvenate its functionality, ensuring smooth height adjustments and stable support. This guide details the process, requiring only a few tools.

Tools Needed:

  • Gas Cylinder
  • Hammer or mallet
  • Wrench
  • Power drill
  • Hexagonal screwdriver (for adjustments)

Steps to Replace the Cylinder:

1) Remove the Seat:

  • Start by locating and removing the two screws on each side of the chair that secure the seat and mesh. Use a power drill for efficiency.
  • Lift the seat off the chair frame and set it aside in a safe area to clear your workspace.

2) Loosen the Cylinder:

  • Lay the chair on its side for better access to the cylinder.
  • Using a wrench, twist the cylinder counterclockwise. Continue this motion until the cylinder detaches from the chair with ease.

3) Remove the Cylinder from the Base:

  • Invert the chair's base to reveal the cylinder's bottom.
  • Employ a hammer or mallet to dislodge the cylinder from the base. Exercise care to prevent damage to the base.

4) Inspect and Prepare the Base:

  • With the cylinder removed, it's an opportune moment to inspect and replace any casters if they are worn out or damaged.
  • Position the base upright in preparation for the new cylinder.

5) Install the New Cylinder:

  • Introduce the bottom end of the new cylinder into the base's opening.
  • Align the top of the cylinder with the opening at the bottom of the chair frame and insert it securely.

6) Adjust the Cylinder's Pressure Pin:

  • Remove the tilt mechanism cover to access the black pressure pin.
  • Ensure the pin is horizontally level. If it's not, adjust it using a hexagonal screwdriver by tightening or loosening as necessary. The goal is to achieve a perfectly level position for optimal function.

7) Reassemble the Chair:

  • Place the seat back on the chair frame, aligning it correctly.
  • Start each screw by hand to ensure they're correctly positioned, then tighten them securely using a hexagonal head on a power drill.


Following these steps will ensure your Aeron chair's cylinder is replaced correctly, restoring its functionality and extending its lifespan. This DIY repair can save you the cost of professional services or the need for a new chair, allowing you to enjoy your Aeron's comfort and support once again.

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