Why Is My Bossin Chair Sinking?

On this page (7 sections)

1. Why is my Bossin chair sinking?
2. What should you check before replacing a Bossin cylinder?
3. How do you check if a replacement cylinder fits?
4. Which gas lift options match the measurements?
5. Should you replace the cylinder or keep the chair low?
6. What if your Bossin chair still sinks after a repair?
7. What is the next step for a sinking Bossin chair?

A Bossin chair usually sinks because its gas cylinder can no longer hold the seat at the set height. Check that the height lever isn't stuck or pressing the cylinder valve, then inspect the cylinder and confirm a replacement fits your chair.

If the seat drops while you're sitting, note whether it happens every time or only after moving the lever. That clue helps you distinguish a cylinder problem from a control that stays engaged.

Why is my Bossin chair sinking?

A Bossin chair that keeps dropping under your weight often has a worn gas cylinder. The cylinder supports the seat at a chosen height, and a failing one may slowly lower it after you sit down.

Check the height control before replacing parts. Make sure the lever returns to its usual resting position and isn't caught against the desk, an arm, or another object.

If the seat falls even when you haven't touched the lever, the cylinder is a stronger suspect. See Why Is My Office Chair Sinking? for other common causes and basic checks.

What should you check before replacing a Bossin cylinder?

Check that the lever moves freely and the chair has no obvious damage. Then compare the old cylinder with replacement measurements before ordering.

1. Move the chair away from the desk and check whether the height lever is obstructed.
2. Raise the seat, release the lever, and see if it stays at that height without someone sitting on it.
3. Sit carefully and note whether it lowers slowly or drops quickly.
4. Look underneath the seat for a loose connection or visible damage, without opening the cylinder.
5. Find the chair model information and compare the cylinder's size and connections with the replacement.

A seat that sinks only while occupied can still point to a failing cylinder. Don't try to open, puncture, heat, or cut one; gas cylinders are sealed parts.

If your chair's lever moves normally and the seat keeps sinking, follow a step-by-step guide to fixing an office chair that keeps sinking. It covers the common repair path and checks to make before removing the cylinder.

Can the height lever make a Bossin chair sink?

A lever that stays engaged can press the cylinder valve and let the seat move. Check for an obstruction or a lever that doesn't return fully before assuming the cylinder has failed.

Don't bend or force the lever. If it appears loose, broken, or out of alignment, check the chair instructions or contact Bossin for help with your model.

How do you check if a replacement cylinder fits?

Compare the cylinder's measurements and connection points with the part in your chair. A “universal fit” description doesn't guarantee compatibility with every Bossin model.

Measure the old cylinder's inner and outer diameters, along with its compressed and extended lengths. Also compare how its ends fit into the base and seat mechanism.

The Office Oasis cylinder has a 1-1/8 in piston shaft and a 2 in column. It includes a removal tool, gloves, and installation instructions.

Don't order based on the word “universal” alone. If you can't remove the old cylinder or identify its measurements, ask Bossin or a repair professional to confirm what fits.

Which gas lift options match the measurements?

Both Omyoffice cylinders have a 5.5 in adjustment range, with lengths of 11.4 in compressed and 16.9 in expanded. Compare these measurements with your old part and your chair's required height range.

Omyoffice describes the 5.5 Inch Office Chair Gas Lift as suitable for most office chairs, while noting that it won't fit every chair. Confirm the cylinder measurements and connections before choosing it.

The Omyoffice 5.5” Office Chair Gas Lift Cylinder has the same stated adjustment range and lengths. Its stated outer diameter is 2 in and inner diameter is 1.1 in.

Both Omyoffice options are described for broad chair compatibility, but not every Bossin model. Measure first and check the chair's instructions if you're uncertain.

Should you replace the cylinder or keep the chair low?

Replace the cylinder if the chair sinks during normal use and the lever isn't stuck. Keeping the seat at one fixed height can be a temporary workaround, but it doesn't restore normal height adjustment.

For a chair you don't need to raise, how to keep an office chair at its lowest height explains the fixed-height approach. It won't repair a cylinder that keeps dropping or make an unstable chair safe.

If you want the seat to hold its chosen height again, see how to stop an office chair from sinking permanently. That guide explains cylinder replacement and other ways people address a sinking seat.

What if your Bossin chair still sinks after a repair?

If a correctly sized cylinder is installed and the seat still drops, the issue may be with the lever or seat mechanism. Recheck the chair instructions and confirm the lever isn't pressing the valve when released.

Don't continue using the chair if it moves suddenly, rocks, or has another damaged part. Contact Bossin with the chair model and a clear description of what happens; a repair professional can inspect the connections if needed.

A sinking seat is separate from a backrest problem. If the chair also won't lean back, see Why Won’t My Office Chair Recline? for checks related to its recline mechanism.

What is the next step for a sinking Bossin chair?

If the height lever is clear and the seat still drops, check the cylinder measurements and replace it with a compatible part. If the seat stays up after you release the lever, keep checking for a stuck control before buying a cylinder.

Compare your old part with the dimensions of The Office Oasis or either Omyoffice option, then follow the chair and replacement instructions. For a separate upholstery issue, read Why Is My Leather Office Chair Cracking?.

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Frequently asked questions

Why does my Bossin chair keep sinking?

A Bossin chair that sinks under your weight often has a worn or failing gas cylinder, which can no longer hold the seat at its selected height. First check that the height lever returns fully and isn't pushing the cylinder valve.

If the chair still drops, measure and compare the replacement cylinder dimensions.

Can I fix a sinking Bossin chair without replacing the cylinder?

You can check the height lever and its connection first, since a lever that stays engaged may press the cylinder valve. If the lever moves freely and the seat still sinks while you sit, replacing the gas cylinder is the usual repair.

Follow Bossin's instructions or ask a repair professional if you're unsure.

How do I choose a replacement cylinder for a Bossin chair?

Compare the old cylinder's outer and inner diameters, compressed and extended lengths, and fitting style with the replacement details. “Universal” does not mean every cylinder fits every chair.

Check your Bossin model instructions and measure the part before ordering, especially if the chair has an unusual base or seat connection.

Is it safe to use a chair that keeps sinking?

A chair that drops without warning can make sitting unstable, so stop using it if the movement feels sudden or the chair otherwise seems damaged. Don't open, puncture, heat, or cut a gas cylinder.

Ask Bossin about support or have a qualified repair person replace the part.