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bbear2
Premium
join:2003-10-06
94045
kudos:5

Hydraulic Chair Doesn't Stay in Place

It's a regular office chair that has a hydraulic height adjustment. When I pull the lever, it will go all the way up (or down). However, after it is raised all the way up, in a little while (sooner nowadays than before) it sinks down to the lowest level. I barley notice it moving down, but it does move.

Is this just the hydraulic cylinder that has gone back? Can they be replaced? Could it be something else?

garys_2k
Premium
join:2004-05-07
Farmington, MI
If it's a name brand chair, like Herman Miller or Steelcase, then yes, you can buy replacement parts. If it's a $99 special from Office Max then no, it's a disposable Chinese item.


jjoshua
Premium
join:2001-06-01
Scotch Plains, NJ
kudos:3
reply to bbear2
I would just get a new chair.

»ask-a-chinese-guy.blogspot.com/2···now.html

bbear2
Premium
join:2003-10-06
94045
kudos:5
reply to garys_2k
It's a Bodybilt. Not the $99 variety for sure.
How can I be sure it's the cylinder and not something else?

garys_2k
Premium
join:2004-05-07
Farmington, MI
Reviews:
·Callcentric
Oh, those are good chairs!

The hydraulic cylinder's job is to hold it's vertical position, your doesn't so it has an internal leak. Not sure where you'd buy replacement parts but they should be available. You may find an equivalent part here: »www.echairparts.com/servlet/the-···tegories


leibold
Premium,MVM
join:2002-07-09
Sunnyvale, CA
kudos:10
Reviews:
·SONIC.NET
reply to bbear2
said by bbear2:

I
How can I be sure it's the cylinder and not something else?

It is the only part on the chair responsible for the chair height. Yours is either leaking internally (bypass on the cylinder walls) or the valve doesn't close properly. The valve is integrated into the cylinder assembly and it would be dangerous to attempt taking the assembly apart.

About the only other possibility that you can check is whether the handle on the chair for the up - down motion is traveling freely and that it doesn't somehow continue to put pressure on the valve (bend handle / mechanics, dirt or foreign objects between handle and valve) causing the valve into a partially open state.

Whatever you do, do it carefully without applying strong forces to the hydraulic cylinder (many are pressurized). Those chair lift mechanisms have been known to cause injury and even death!
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jack b
Gone Fishing
Premium,MVM
join:2000-09-08
Cape Cod
kudos:1
reply to bbear2
It should be under warranty unless it's 15 years old.