Why Is My Office Chair Sinking and Not Holding Height?

An office chair that slowly sinks is usually due to a failed gas cylinder. Replace the cylinder in about 20 minutes with basic tools.

Category:Furniture

Difficulty:Moderate

Time:20 min

Success:50%

Updated:Jun 23, 2026

quick_referenceQuick Answer

For Why Is My Office Chair Sinking and Not Holding Height?, start with "Remove the Seat from the Base": Tilt the chair upside down. Use a screwdriver to remove any screws or clips securing the seat to the gas cylinder mechanism. Lift the seat off. Stop DIY if the chair base is cracked or damaged. This is listed as a moderate recovery and usually takes about 20 min.

verifiedGuide Snapshot

Repair areaFurniture

Estimated time20 min

DifficultyModerate

Stop conditions3

Last updated Jun 23, 2026. Review the stop conditions before continuing.

account_treeRecovery State

DeviceOffice Chair

Current stateSinking

Specific stateGas Cylinder Failure

Failed stepCylinder Seal Leak

Likely failure typeWorn Part

DIY boundaryDIY recovery first

paymentsCost decision

help1. Understand the Problem

If your office chair slowly drops when you sit on it, the pneumatic gas cylinder has lost its ability to hold pressure. The cylinder is a sealed unit and cannot be repaired, but it can be replaced relatively easily with a few common tools.

build_circle2. Try This First

Best First Step

Remove the Seat from the Base

Tilt the chair upside down. Use a screwdriver to remove any screws or clips securing the seat to the gas cylinder mechanism. Lift the seat off.

visibility3. Visual Guidance

See what's happening and how to try the first recovery step.

Remove the Old Gas CylinderPlace the base on the floor. Use a rubber mallet to tap the cylinder out of the wheel base from the top or bottom, depending on design.

Install the New CylinderInsert the new cylinder into the wheel base. Tap it gently with a rubber mallet to seat it fully. Attach the seat mechanism onto the top of the cylinder.

Reattach the SeatAlign the seat bracket with the top of the cylinder and press down firmly. Reinstall any screws or clips that were removed.

Test the Height AdjustmentFlip the chair upright. Sit on it and use the height adjustment lever to raise and lower the chair. It should hold position firmly.

autorenew4. If That Doesn't Work

Try the next recovery options.

Replace the Gas CylinderPurchase a replacement cylinder matching your chair's diameter (usually 1.5 or 2 inches). Remove the old cylinder using a rubber mallet and install the new one.

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