Why Does Office Chair Keeps Sinking? [Full Guide]

Your office chair keeps sinking because the chair cylinder (also known as the valve) is no longer working.

You’re sitting in your office chair, minding your own business and getting some work done, when all of a sudden you feel yourself sinking. Your chair seems to be slowly swallowing you whole, and no matter how much you adjust, you just can’t seem to get comfortable. Sound familiar? If so, then you’re not alone. Many people have experienced the same thing, and it can be quite frustrating. But don’t worry, there is a solution. In this blog post, we’ll explore why office chairs sink and how to fix them.

There are several reasons why an office chair might sink. The most common reason is that the gas lift mechanism is faulty. The gas lift is what allows you to adjust the height of your chair, and over time it can wear out. Another possible reason is that the seat base is too small for the weight of the person sitting in the chair. This problem is most likely to occur in chairs that are not designed for heavy-duty use. Finally, it’s possible that something is wrong with the tension control knob. This knob controls the amount of tension in the springs of your chair, and if it’s not set properly, your chair will sink.

How to Fix an Office Chair That Keeps Sinking

  1. Using Lubricant

    If your office chair is starting to sink, one quick and easy fix is to use a lubricant. All you need is a can of WD-40 or another type of lubricant. Just spray it onto the gas cylinder (the part of the chair that controls how high or low it goes) and give it a few pumps. The lubricant will help the cylinder move more smoothly, which should stop the sinking.

  2. Using Hose Clamp

    If the lubricant doesn’t do the trick, try using a hose clamp. First, unscrew the base of the chair from the gas cylinder. Then, put the hose clamp around the cylinder and screw the base back on. The hose clamp will act as a stopper, preventing the cylinder from moving too far down. Just be careful not to make it too tight you still want to be able to adjust the height of your chair!

  3. Using PVC Pipe

    This next fix is similar to the one before, but instead of using a hose clamp, you’ll be using a piece of PVC pipe. Just cut a small section of pipe that’s slightly wider than the diameter of the gas cylinder. Then, put it over the cylinder and screw the base back on. The PVC pipe will act as a stopper just like the hose clamp did.

  4. Replacing the Office Chairs Gas Cylinder

    If none of those fixes worked, then chances are you need to replace your office chair’s gas cylinder. Fortunately, this is a fairly easy fix that you can do yourself with just a few tools. First, unscrew the base of the chair from the gas cylinder. Then, remove any remaining pieces (hose clamps, PVC pipe, etc.) and set them aside. Next, take out the old gas cylinder and insert the new one. Finally, screw the base back on, and voila! You should have a brand-new office chair that doesn’t sink.

  5. Bonus Fix for Sinking Office Chair

    Here’s a bonus tip for anyone who wants to prevent their office chair from sinking in the future: try adding some sand to the gas cylinder before screwing on the base. This will add weight to the bottom of the chair and help keep it from sinking over time. Just be sure not to add too much sand you don’t want your chair to be too heavy to move.

Extra Steps to Follow

  1. Check the gas lift for leaks. The first thing you’ll want to do is check the gas lift for any leaks. If there are any cracks or holes in the gas lift, air will escape and cause the chair to sink. To check for leaks, unscrew the gas lift from the bottom of the chair and inspect it for any damage. If you find any cracks or holes, you’ll need to replace the gas lift.
  2. Replace the O-ring. If there are no leaks in the gas lift, then the problem may be with the O-ring. The O-ring is a small rubber ring that sits on top of the gas lift and seals it shut. Over time, O-rings can become brittle and crack, which will cause air to escape and make the chair sink. To replace the O-ring, simply remove the old one and put a new one in its place.
  3. Adjust the tension knob. If your chair is still sinking after checking for leaks and replacing the O-ring, then it’s time to adjust the tension knob. The tension knob is located under the seat and controls how much pressure is required to raise or lower the chair. If you turn the knob clockwise, it will increase the tension and make it harder to sink; if you turn it counterclockwise, it will decrease the tension and make it easier to sink. Try adjusting the knob until you find a setting that works for you.
  4. Contact customer support. If none of these solutions solve your problem, then you may need to contact customer support for your office chair manufacturer. They should be able to help you troubleshoot your specific issue and get your chair working properly again in no time!


If your office chair keeps sinking, don’t despair! There are some easy solutions to this problem. Most likely, the issue is with the gas lift mechanism or the tension control knob. These parts are readily available and easy to replace. Or, if you prefer an easier fix, you can try using a thicker cushion or placing a board under the seat fabric to provide more support. With these simple fixes, you should be able to stop your office chair from sinking!

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