Office Chair Gas Lift Cylinder Replacement, Class 4 Hydraulic Piston | 4.7" Lift Universal Fit Pneumatic Chair Lift Replacement for Desk Chairs, Gaming Chairs, Executive Office Chairs

I received my office chair cylinder replacement quickly. I'm usually impressed by the fast delivery by Amazon and its vendors. I was cautiously optimistic regarding taking the old cylinder apart from the chair after reading reviews by peoples experiences. I' a good sized cro-magnum 6'3" 230 lbs and the chair had worked well 5 or more years so the cylinder was well seated into the chair frame and base. I had necessary tools pipe wrench, rubber mallet, WD-40 etc... watch a few videos before attempting to remove the defective cylinder, it will help and set some expectations. Put an old blanket or large piece of cardboard down so the WD-40 doesn't get on your floor or carpet or better do it in the garage. After spraying the chair base where the cylinder goes in to it, I firmly tapped each leg of the chair to start loosening things, then turned the chair over and beat it quite hard 8-10 times and the base of the chair came free. Don't be shy about banging on that base. Some videos suggested using a hammer to separate the cylinder from the chair back? not easy to do and a small surface to get at with a hammer. The disks provided with your new cylinder were a great idea. Start by getting some WD-40 around the cylinder. I put one of the round rings around the cylinder as close the the chair bottom as possible, using the longer screws provided, you use the allen wrench to tighten the screw till you feel it's quite snug, then do the same with the other longer screw. It is a slow process but each time you tighten the screw it is slowly pulling the cylinder away from the chair bottom. Be patient and just keep turning the screws in a little on each side. I was not able to use that process to remove the cylinder completely, but I got enough of it away from the chair bottom to use the pipe wrench to twist it enough to remove the cylinder. Don't worry about scaring the old cylinder up get the pipe wrench on it good and if you can't move it with one hand you can hit the wrench with a hammer or get another person to hold the chair bottom so you can use two hands and keep using the WD-40. Once the old cylinder is removed the rest the process is very easy. Put the chair base on the floor with the casters or wheels on the floor. Put the new cylinder in make sure the clip on the cylinder is pointed at the floor. On the other end (MAKE SURE YOU REMOVE THE BLUE PLASTIC CAP) on the top of the cylinder before putting the chair on top of the new cylinder very important. Once you've done that you should be good to go. As others have mentioned and in my situation, this after market cylinder is longer than original cylinder in my chair, it works fine but at its lowest point it is where my original chair would be at the highest point. Just depends how much leg room you have under a desk. One other tip I read was every week or two, raise and lower your chair to move the cylinder up and down, that will keep the cylinder and seals lubricated. Trust me I'm not an engineer, but that makes sense that leaving your chair in the same position for years the seals could dry out, you get a crack and lose pressure in the cylinder. OK Mates... sorry for the long review best of luck. In all it took me maybe 40 minutes to do this

During the pandemic, safer at home days, I started to notice that my posture was a little off and my lower back was starting to hurt. I then noticed that the chair wasn't in the proper position any longer and I was not able to raise it any higher. I knew immediately that I needed a new chair or the back pain would progressively start getting worse. However, knowing that Amazon sells everything, I decided to see if they sold just the cylinder replacement since a new chair would cost me about $200 (and my current chair was in really good condition other than the cylinder height). I opted to purchase this item due to it being a full kit as well as offering a coupon discount. When the kit arrived, my initial install try failed miserably. First, I was not able to remove the chair as I couldn't slip the hex key between the bottom collar and the stock plastic sleeve that covers the "unsightly" cylinder. I know I could've cut the sleeves off, giving me the clearance. But, I wanted to maintain the original look of the chair as much as possible. Second, no matter how hard I hammered at the bottom of the cylinder with the rubber mallet, it refused to budge and I couldn't get it to detach from the base. I even soaked the seam with WD-40 and let it sit overnight. Still, no movement at all. Try number two. I turned back to Amazon to see if they sold stubby hex keys, which I immediately ordered. Day number two, the stubbies were delivered and voila, fit perfectly between the collars and the plastic sleeves. Next thing you know, the chair was detached. I then turned my attention back to the base... I took the base and placed it on top of a five-gallon bucket and again, soaked the seam with WD-40. After an hour, I hammered the cylinder again with the mallet and to no avail. I finally turned to a metal hammer and used the side of the hammer to equally disperse the energy to the edge of the cylinder base. After a couple of strong strikes, the cylinder popped right out. Excitedly, I cleaned off the WD-40 from the base, installed the new cylinder on the base, removed the plastic button cap, and installed the chair. The cylinder worked perfectly and at its highest height, I couldn't even place my feet flat on the ground (and I'm 6'1"). This cylinder replacement, even with the stubby hex key set purchase, saved me about $140. For those who prefer a tl;dr version/tips: 1.) Buy a stubby hex key kit if the included hex key will not work between the bottom collar and plastic cylinder sleeves 2.) Remove the chair using the included collars 3.) Place chair base and cylinder upside down into a five-gallon bucket 4.) Hammer the cylinder through using the flat side of the hammer (or use a block of wood between the cylinder and hammer) 4a.) A rubber mallet was not strong enough

1- The piston itself works great, is large and sturdy. An inch or two longer than the one that came with the original chair so if you are using your chair's lowest setting this may not work well for you. 2- The replacement tool works well enough and is not difficult to use if the piston you're removing is fully expanded. The chair I was fixing was several years old the old piston firmly embedded in the seat's mounting plate. I have an electric heat gun and with a little heating of the seat's mounting plate the old piston slid right out. 3- The instructions for the removal tool are terrible. Assemble the first collar right against the seat's mounting bracket. DO NOT tighten it to clamp onto the piston, it has to slide and rotate freely. Clamp the second collar directly below the first but DO NOT line up the holes between the two collars. Make sure they are offset and clamp the second tightly to the old piston shaft. Now when you tighten the long hex bolts through the second clamp it will press against the first and force the piston out of the seat's mounting plate. If you line them up you will only fasten the two clamps to each other. 4- The first time I used this product I found that the height adjustment did not work. I thought it was because the chair's adjustment rod would not press the adjustment button on the top of the piston. THAT WAS NOT CORRECT. It turns out that the piston is shipped with a small safety cap covering the height adjustment button at the end of the piston. It keeps the button from accidently being depressed and expanding the piston during shipping. You kind of need to take that off BEFORE you assemble the seat onto the new piston. When properly assembled the product works great but only gets a 4 star review. The product gets 5 stars, the instructions get -1.

Works perfect, extends way higher than original. Makes my office chair almost able to extend as high as a draft chair which is awesome.. Couple of possibly helpful tips though if you are taking on changing out your cylinder.. There is a video by The Office Oasis, which is basically the same product type and with the same replacement tools. The how-to steps in their video are slightly different than the instructions that come printed with this, and I highly recommend following the video directions versus the written ones. Also, my chair is a few yrs old so the cylinder was good and stuck in the chair & base. The video & written directions both say for the removal tool to attach both the collars, and line up the holes on both collars to thread the 2 long screws thru, but that did NOT work for me and ended up being a pain to back out the screws. What I did that ended up working though to remove the old cylinder was to tighten the bottom collar (to use as the anchor), attach the 2nd collar on top of the bottom one and leave it loose/moveable, BUT to NOT line up the holes for the long screws, meaning that the screws were threaded thru the bottom collar, but instead of threading thru the holes on the top collar the screws would just bump up against the top collar itself to push it upward, and that worked to pop off the cylinder from the chair base. The other good advice that comes from the office oasis video is to use a trash barrel to set the wheel base on upside down so that you can hit the cylinder with a hammer or mallet, and it will then pop out and land in the trash barrel. I did have to use some penetrating oil, and also used a flat head screwdriver to use as a wedge and tap the top w/the hammer to loosen the sides up, and after a LOT of hard smashes with a hammer the old cylinder finally popped out of the wheel base. That is all the hard parts, once thats done its just putting the new cylinder in and chair back on top! So I will say that it was a bit harder than they make it look, but its understandable since again my chair is a few years old at this point, but its also WELL worth the money and effort.. $15 versus a whole new chair is a no brainer for me.. So definitely recommend the product, but if you are NOT someone whos willing to put some elbow grease into it, and have some extra tools to use as needed or improvise if needed, then you may want to just get a new chair if you can afford it.

I purchased one of your lift repair kits on Amazon yesterday. I removed the old lift and installed the replacement. Removing the old lift was not as easy as I expected. After applying some WD-40, I was able to remove the lift from the base. However, removing it from the chair was more difficult. I let the WD-40 soak in for a few minutes, and then it finally came out. I also found an adjustment on YouTube involving a set screw that the release lever operates. It needed to be adjusted, and after making that adjustment, the chair worked great. Thank you for the kit-it saved me a lot of money by not having to purchase a new chair.

Poor quality kit and removal collars. My kit was missing one M6 hex head screw needed to hold one of the two collars together, so I had to order an assortment of hex head screws from Amazon to find a screw that fit. It would have been a little more helpful if the kit manufacturer listed the screw sizes on their instruction sheet. The cut threads for one of the longer hex head screws were not cut cleanly and I had to force the screw through the hole, stripping the threads on the screw off. The collars did not budge the shaft from the seat bracket, so I found it easier to remove the bracket and roller assembly from the bottom of the seat and disassemble the piston by removing the retaining clip. Once the piston was disassembled I put some 3 in 1 penetrating oil on the seat bracket, let it sit overnight then wacked the end of the piston shaft with a carpenter's hammer. The piston popped right out of the bracket with one hit. This was the second kit that I purchased from this supplier. I purchased the first kit used and when it arrived one of the collars were missing, there were no screws, and there was a loud rattling sound coming from inside the piston. I returned it to Amazon as is, but somebody should have examined this used kit before it was resold to make certain all the parts were there.

First of all. The piston itself is fantastic and sturdy. It is a little longer/taller than my old one so it makes my chair taller at the full extension. I don't mind this, I like my feet to dangle since I put my feet on a footstool. Do make sure to take off the small plastic cap at the top of the metal rod of the cylinder before installing or the mechanism to lift and lower will not work. That being said, the cons have nothing to do with the product itself. The hardest part of this whole process is getting your old cylinder out of your chair. At least, it was for me. After watching a couple videos of how to remove the old cylinder from the chair, I set down to take it apart. Mind you, I'm no small girl at 5'5" and 250+ lbs. Taking the star base of the chair and cylinder apart was easy. I just alternated pounding the bottom part of the cylinder and the star itself until I could pull it off. The casters came off during the process, making my cats scatter in pure terror. So...pro tip. Take off the casters. Next came the detachment of the cylinder from the bottom of the chair. I used the items they gave. The two collar type mechanism where one is supposed to be loose against the bottom of the chair and the second one is tight on the cylinder itself. In essence and theory, the tight collar is supposed to stay still while you thread the bolts through the threads and push the cylinder out of its snug little home. Sounds easy right? It should have been but the tight collar kept slipping for me. Threading the bolts only pushed the tight collar down the cylinder rather than pushing the cylinder out of the bottom of the chair. It was a rather ineffective way to pull the cylinder out for me. Frustrated and with the might of Thor running through me, I got a mallet and tried to lift the chair as I hammered the bottom of the chair. Much to my chagrin, the cylinder would not budge. Even after the application of penetrating oil. I even tried a regular wrench but only succeeded in scratching up the old cylinder. Fast forward two days later and I went to Lowe's and bought myself a 14" pipe wrench. Who doesn't need a pipe wrench in their tool box? I felt like a true, diy woman of distinction as I bought these heavy inches home. As I sat down and put the wrench to the old cylinder, I knew I was going to make it my new female dog. It was reluctant at first and I had to figure out the best position for leverage and I pushed and pulled with all my weight. After about a minute, the cylinder was out. As I belted my yell of victory and raised my hammer...er wrench above my head, I stood over my defeated enemy. My cats could finally live without the fear of loud pounding and they swarmed the enemy to further humiliate the old cylinder. Attaching the new one was easy, simply slipping into place so that I could finally claim my throne. So...tl;dr. Get yourself a pipe wrench, some penetrating oil and some brawn. The product itself is great but the tools provided may or may not work.

I purchased this item in October 2023 to replace the leaking original gas cylinder on my computer chair. Installation was very convenient thanks to the included tools; however, its lifespan fell far short of my expectations. The original cylinder lasted four years before it began to leak oil, whereas this product started slowly losing air after just two years of use—meaning it is unable to maintain its set height. Given that this gas cylinder was not inexpensive, I am extremely disappointed.

After battling with it and finally getting it done it sags. 160lbs on a heavy day, all installed correctly, and I can literally feel it going down as I sit here. I had to bust the retainer clip on the bottom of my old piston to get it off so....now what do I do? Replace and get a refund on this waste of time and effort and leave my chair out of action or just suck it up?? Pfft not impressed.

Quality, Packing, Instructions and even the accessories were perfect and top quality. Recommended +++

I was able to successfully replace my chair cylinder with this kit and nothing else. Instructions were clear. The cylinder works wonderfully and does not sink. Will buy again if I need one for another chair.

I asked a question about this, and got some feedback that it might not fit my chair, as the taper at the bottom of the cylinder might not be pronounced enough. I saw that the seller offered free returns if the lift didn't fit, and that it fits 95% of chairs out there, so I thought that I had nothing to lose. I've given it Comfort 5*, as it's made such a difference to my chair. The old lift had a cracked bushing, so flopped backwards and forwards, and side to side, and made a hideous clank noise when you sat down or stood up. I gave it 5* value for Money, as it's half the price of the next closest lift, and comes with a fitting kit and gloves. I gave it 5* ease of assembly, as once you've got the lift off the old chair, it's literally a case of dropping it in to the base and then putting the chair seat on top and pushing down. I didn't even have to adjust the offset screw for the height adjuster lever. One thing I will say is that this is *slightly* wider than the standard Aeron lift taper. This has the advantage that the bottom of the lift isn't 3mm off the floor (which is something that always bothered me). It has the disadvantage (if you can call is that) of the height of the chair being ~3-4cm higher on the minimum than it used to be. For me, this isn't a problem at all, and I have a fairly low desk. As with other reviewers, I did have a bit of an issue getting the old lift out - this is nothing to do with this new lift, so I can hardly mark them down for it. I had the same problem that everyone else had, in that the top of the lift won't come out of the chair base. The locking ring slid down the lift slightly as the bolts were tightened. Unlike others, the ring didn't slide down too far - the bolts themselves deformed the top ring, making deep holes in it. In the end, I removed the clip from the bottom (to remove the base and lower shroud). A standard hammer had no effect at all, so I ended up using a sledgehammer. It popped out with a single blow. I removed the seat from the top of the lift using a plumbers wrench. I was unable to do it by hand, but again, a quick smack from a sledgehammer took it right off. At that point it was a case of wiping out the upper and lower holes, putting the new lift into place, taking the plastic cap off, and putting the seat on top. My getting on for 25 year old Aeron is now as good as new!

The removal collar works perfectly, and the new cylinder is very strong, adding another 5cm to the total heigh if my chair which is perfect.