How To Fix An Adjustable Chair That Keeps Sinking

Are you tired of constantly readjusting your chair throughout the workday because it keeps sinking? It can be frustrating and distracting to be constantly shifting your weight and disrupting your focus.

Luckily, fixing an adjustable chair that keeps sinking is a relatively easy and straightforward task that can save you time and energy in the long run.

In this article, we will guide you through the steps of identifying the problem, gathering the necessary tools, and replacing the faulty parts to restore your chair to its proper height. We’ll also cover how to tighten loose screws and provide tips for preventing future problems.

With a little bit of effort and some basic tools, you can have your chair working like new again in no time.

Identify the Problem

To properly diagnose the issue, it’s important to identify why the adjustable chair keeps sinking. The first thing you should check is the gas cylinder. This is the part that controls the height of the chair. Over time, the cylinder can lose pressure or become worn out, causing the chair to sink. If this is the case, you may need to replace the gas cylinder.

Another possibility is that there is a problem with the tilt mechanism. The tilt mechanism is the part of the chair that allows you to adjust the angle of the seat and backrest. If this mechanism is not functioning properly, it can cause the chair to sink. To check the tilt mechanism, you should first make sure that all of the levers and knobs are properly tightened and adjusted. If this doesn’t solve the problem, you may need to replace the tilt mechanism.

It’s possible that the problem is simply due to wear and tear. Over time, the various parts of the chair can become loose or worn out, which can cause the chair to sink. To check for this, you should inspect the chair carefully, looking for any signs of damage or wear. If you notice any issues, you may need to replace the affected parts or consider getting a new chair altogether.

Gather the Necessary Tools

Before we get started, let’s make sure we have all the tools we need to tackle this annoying problem with our favorite seat. Here’s a list of the things you’ll need to fix an adjustable chair that keeps sinking:

  • A screwdriver (both flathead and Phillips may be needed depending on the type of screws on your chair).
  • A pair of pliers (you’ll need these to grip and twist certain parts of the chair).
  • A replacement gas cylinder (this is the part of the chair that holds it up and prevents it from sinking).

Make sure you have these tools on hand before you begin. You don’t want to start the process and then realize you’re missing something important. Having everything ready will make the process smoother and faster.

Once you have gathered all the necessary tools, you’re ready to start fixing your chair. Remember to take your time and follow the instructions carefully. With the right tools and a little bit of patience, you’ll have your chair fixed in no time.

Don’t let the sinking seat ruin your productivity any longer. Get those tools and get ready to fix your chair like a pro!

Replace the Gas Cylinder

Now it’s time to replace the gas cylinder. Don’t worry, it’s easy! Here’s what you need to do:

  • Remove the old gas cylinder.

  • Install the new gas cylinder.

That’s it!

Remove the Old Gas Cylinder

First, you’ll need to locate the lever that releases the gas cylinder. This lever is usually located under the seat, towards the front of the chair. Once you’ve found it, pull it outwards to release the gas cylinder from the base of the chair.

Next, you’ll need to use a wrench to loosen the nut that secures the gas cylinder to the seat. Turn the wrench counterclockwise to loosen the nut, and then use your hands to unscrew it the rest of the way. Be sure to hold onto the gas cylinder as you do this, so it doesn’t fall out of the chair.

Once the nut is removed, you should be able to pull the gas cylinder out of the chair. Congratulations, you’ve successfully removed the old gas cylinder!

Install the New Gas Cylinder

To properly install the new gas cylinder, locate the correct size and model that fits your chair. There are a variety of gas cylinders available on the market, so you’ll want to make sure you choose the right one. Here’s a table to help you narrow down your options:

Brand Model Cylinder Height Cylinder Diameter
A 123 10 inches 2 inches
B 456 8 inches 3 inches
C 789 12 inches 2.5 inches
D 101 9 inches 2.75 inches

Once you’ve identified the right gas cylinder for your chair, it’s time to install it. Here’s how:

  1. Remove the protective cap from the top of the new gas cylinder.
  2. Insert the bottom of the new gas cylinder into the base of the chair.
  3. Align the top of the new gas cylinder with the hole in the seat plate.
  4. Push the new gas cylinder up into the seat plate until it clicks into place.
  5. Sit in the chair and test the height adjustment to ensure it’s working properly.

By following these steps, you should be able to successfully install the new gas cylinder and fix your sinking chair.

Replace the Faulty Lever

One solution could be simply replacing the faulty lever with a new one, which should prevent the chair from sinking.

To do this, first, you need to remove the old lever. Usually, you can do this by turning the chair upside down and looking for the screws that hold the lever in place. Once you locate the screws, use a screwdriver to unscrew them and remove the old lever.

Next, you need to install the new lever. To do this, take the new lever and place it in the same position as the old one. Make sure the screw holes match up with the holes in the chair. Then, use the screws from the old lever or the new screws that came with the new lever to attach it to the chair. Tighten the screws firmly but don’t over-tighten them as it may damage the chair.

Test the chair to ensure that the new lever has fixed the problem. Sit on the chair and adjust it to your desired height. If the chair doesn’t sink anymore, you’ve successfully fixed the problem. If the chair still sinks, you may need to try another solution such as replacing the gas cylinder or checking for other faulty parts.

Tighten Loose Screws

To tighten the loose screws in your adjustable chair, first locate where they are. Check the base, seat, backrest, and armrests.

Once you find the loose screws, use a screwdriver to tighten them.

Locate the Loose Screws

First, you’ll want to check for any loose screws in the chair to identify the root of the sinking issue. Start by flipping the chair over and examining the base. Look for any screws that may be loose or missing. If you find any loose screws, use a screwdriver to tighten them.

If any screws are missing, you’ll need to replace them with new ones. Next, check the seat and backrest of the chair for any loose screws. You may need to remove the cushions or covers to access the screws. Once you locate any loose screws, tighten them with a screwdriver.

It’s important to check all screws in the chair, even if they don’t appear to be loose, to ensure that they are all secure. By checking and tightening any loose screws in the chair, you should be able to prevent the chair from sinking and ensure that it remains stable and comfortable.

Tighten the Screws

After locating any loose screws, simply tighten them with a screwdriver to ensure the chair remains stable and comfortable. Start by turning the chair upside down and examining the base for any screws that may need tightening. Use a screwdriver to turn the screws clockwise until they’re snug and secure.

If the chair still sinks after tightening the screws, check to see if the gas cylinder is functioning properly. If it’s not, you may need to replace it. However, if tightening the screws did the trick, you should be able to enjoy your adjustable chair without any further issues.

It’s always a good idea to periodically check the screws on your chair to ensure it remains stable and safe to use.

Test Your Chair


Test your chair


Check if your chair is sinking by adjusting it to your desired height and seeing if it stays in place or gradually lowers over time. If it sinks, then it’s time to test your chair and see if it’s still working properly.

Here are some steps you can follow to test your chair:

  • Sit on the chair and adjust it to your desired height.
  • Apply pressure to the chair by leaning back and forth, and side to side.
  • Test the height adjustment mechanism by adjusting the chair up and down while applying pressure.

If your chair sinks, it’s possible that the gas cylinder inside the chair is faulty. In this case, you may need to replace it. However, if the chair stays in place and doesn’t sink, then your chair is working properly.

It’s important to test your chair periodically to ensure that it’s still safe and comfortable to use. By following these simple steps, you can easily test your chair and fix any issues that arise.

Prevent Future Problems

To prevent future problems with your adjustable chair, you need to make sure that you perform regular maintenance on it. This includes tightening any loose screws and lubricating any moving parts.

Additionally, you should use and handle the chair properly by not exceeding its weight limit and avoiding any sudden movements that could damage it.

By following these simple steps, you can ensure that your chair lasts for years to come.

Regular Maintenance

Don’t neglect regular maintenance on your adjustable chair if you want to prevent it from sinking. One of the main reasons chairs sink is because the gas cylinder loses pressure over time. To prevent this, make sure to regularly check the gas cylinder for leaks or damage. If you notice any issues, replace the cylinder immediately.

Another important aspect of regular maintenance is cleaning. Dirt, dust, and debris can accumulate in the chair’s mechanisms and cause it to malfunction. Use a soft cloth and mild cleaner to wipe down the chair’s parts, paying special attention to the gas cylinder, base, and casters.

By taking these simple steps, you can extend the life of your adjustable chair and prevent it from sinking.

Proper Use and Handling

Ensure you’re using and handling your chair properly to avoid any potential issues. When adjusting the height, make sure you’re doing it in a controlled manner. Don’t just release the lever and let the chair drop down. This sudden drop can cause damage to the chair’s hydraulic system, leading to it sinking on its own. Instead, gently ease the chair down to your desired height and lock the lever back into place.

Another important aspect of proper use and handling is to avoid overloading the chair. Most chairs have a weight limit, and exceeding it can cause damage to the hydraulic system. This can lead to the chair sinking or not staying in place at the desired height. Be mindful of the weight of the person using the chair and any additional weight from items such as bags or books.

By following these simple tips, you can prolong the life of your adjustable chair and avoid any sinking issues.


Congratulations! You’ve successfully fixed your sinking adjustable chair. By following the steps outlined in this article, you were able to identify the problem, gather the necessary tools, replace the gas cylinder or faulty lever, tighten loose screws, and test your chair.

However, it’s important to note that preventing future problems is just as important as fixing current ones. Make sure to regularly inspect your chair for any signs of wear and tear and address any issues as soon as possible.

By taking proactive measures, you can ensure that your chair remains in good working condition, providing you with comfort and support for years to come.