How Do You Disassemble a Hydraulic Bar Stool?

To disassemble a hydraulic bar stool, first release all the pressure by lowering the seat to its lowest setting. Turn the stool upside down on a blanket, unscrew the seat plate from the swivel mechanism, then separate the gas cylinder from the base. The cylinder is held in the base and the mechanism by a tapered friction fit rather than a fixing, so it needs to be tapped or twisted free rather than unbolted. Most stools come apart in fifteen minutes with an allen key, a spanner and a rubber mallet.

Before You Start

A gas lift cylinder contains compressed nitrogen. It is not dangerous in normal use or in normal dismantling, but it must never be cut, drilled, heated or forced open. If a cylinder is damaged or leaking oil, replace it rather than attempting a repair.

Lower the seat fully before doing anything else. A cylinder at its lowest setting has released its extension, which makes separation easier and safer. Clear a space, lay down an old blanket to protect both the floor and the stool finish, and have a small container ready for the fixings.

Tools You Will Need

An allen key set, since most seat plates use hex bolts. An adjustable spanner or socket set. A rubber mallet. A flat headed screwdriver. A pair of pipe grips or a strap wrench for stubborn cylinders. Penetrating oil if the joint has corroded.

Gloves are worth wearing. Chrome columns are smooth until they are not, and a corroded footring can leave a sharp edge. Keep a marker pen handy to note the orientation of parts before you separate them.

Step One: Remove the Seat

Turn the stool upside down so it rests on the seat, with the base in the air. Support the seat on the blanket so the upholstery is not compressed against a hard floor.

You will see a metal plate fixed to the underside of the seat, usually with four bolts, and the swivel mechanism attached to that plate. Undo the four bolts and lift the seat away. If the bolts have been factory tightened, a short burst of penetrating oil and a few minutes of patience saves rounding the heads.

Some designs have a lever or a threaded ring for height adjustment attached to the mechanism. Note how it sits before removing anything, since these parts are easy to refit the wrong way round.

Step Two: Separate the Cylinder from the Mechanism

The top of the gas cylinder tapers slightly and pushes into a matching taper in the swivel mechanism. Years of use makes this a very tight friction fit, which is intentional, as it stops the seat working loose.

Hold the mechanism in one hand and tap the base of the cylinder collar with a rubber mallet, working around the circumference rather than striking one spot. Even, repeated taps break the friction. If it resists, twist the mechanism firmly while tapping, or clamp the cylinder in a strap wrench for better grip. Never strike the chrome column itself, as a dent will stop the seat travelling smoothly.

Step Three: Free the Cylinder from the Base

The lower end of the cylinder sits in the central hub of the base, again on a taper. Stand the base on the floor, hold it down with your foot, and tap the underside of the hub upwards while pulling the cylinder.

A quicker method is to invert the assembly, rest the base on two blocks so the hub is clear, and tap the end of the cylinder down through the hub. Gravity and a few firm taps usually do the work. Keep the plastic sleeve or telescopic cover, as it slides off once the cylinder is free and is easy to lose.

If the joint has rusted, apply penetrating oil around the hub and leave it for half an hour. Corrosion around the base is common in conservatories and utility rooms, and it is worth treating the metal while the stool is apart. The same care applies to any metal framed piece kept in a damp room, including the modern bar stools UK sale designs that live near external doors.

Step Four: Footring and Base

Many gas lift stools have a footring clamped around the column with a single bolt or a split collar. Loosen the bolt and slide the ring off the column. If it will not move, it has usually seized on rust rather than being tightened excessively, so oil and gentle rotation are the answer.

The base itself rarely comes apart further, being either a single casting or a welded assembly. Remove the glides or castors if you are replacing them, prising them out with a flat screwdriver.

Reassembly Notes

Reassembly is the reverse order, and the tapers are self locking, which means they simply need pushing together firmly. Fit the cylinder into the base, place the mechanism on top, then sit the seat on the mechanism and press down with your body weight before bolting the seat plate on.

Do not grease the tapers. Lubricating a friction fit prevents it locking, and the result is a seat that pulls away when someone stands up. A light oil on the sliding portion of the column is fine, and helps the height adjustment run smoothly.

When to Replace Rather Than Repair

A cylinder that sinks slowly under weight has lost its seal and cannot be recharged. Replacements are widely available in standard sizes, so measure the column diameter, the overall closed length and the extension before ordering.

If the base is cracked, the seat plate is bent, or the mechanism has play in it, replacement of the whole stool is usually the sensible course. Structural parts under a person at height are not worth improvising with. Comparing what a repair involves against the current gas lift bar stools UK sale options makes the decision straightforward, and if you would rather avoid mechanisms altogether, our modern bar chairs UK include fixed height designs with no cylinder to fail. Full seating and kitchen collections are available at Furniture in Fashion, and returns are available up to 30 days.

Frequently Asked Questions

Is it safe to take apart a gas lift stool?

Yes, provided you lower the seat first and never cut, drill or heat the cylinder. Ordinary dismantling with an allen key and a mallet releases no pressure and involves no risk.

Why will the gas cylinder not come out?

The joint is a tapered friction fit designed to lock tighter with use, and it may also have corroded. Apply penetrating oil, tap evenly around the collar with a rubber mallet, and twist rather than pull.

Can I replace just the gas cylinder?

Usually yes. Measure the column diameter, closed length and travel, then order a matching replacement. This is often the only part that fails on an otherwise sound stool.

Do I need to grease the parts on reassembly?

No grease on the tapers, as they rely on friction to hold. A little light oil on the exposed sliding column is helpful and keeps the height adjustment smooth.

How do I stop the seat sinking again?

A sinking seat means the cylinder seal has failed and no adjustment will cure it. Fit a new cylinder, and avoid dropping onto the seat from standing, which is what damages seals in the first place.