Rebuilding the lift mechanism is a two part process.
Fix wobbly computer chair.
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Remove chair pad screws with cordless screw gun.
Check to see if any screws or bolts are loose.
If the chair is at the wrong height move the clamp higher or lower on the cylinder.
This plate contains several screws and bolts as well as the adjustment lever and hydraulic lift.
Most standard office chairs are controlled by a hydraulic or pneumatic lift mechanism that allows the users to move the seat up and down to suit their body shape and desk setup.
The height of the chair is normally controlled using a lever below the chair.
The chair should now be unable to slide down past the clamp.
Examine the black plate on the bottom of the chair s seat.
If you ve got wooden chairs that wobble follow these steps and fix them for good.
Remove corner blocks tap out with rubber mallet if glued.
When the lever is pulled to one position the lift mechanism of the chair propels the chair to its top height.
I don t see any bolts losened or gone.
If the lift mechanism in your office chair needs repair but the upholstery portion is still in good shape don t toss the chair.
Be sure to take care when removing the corner blocks and joints.
How would i fix this without having to spend another 100 on a computer chair.
The built in height adjustment will still not work properly.
If so tighten with the appropriate type of screwdriver flat head or phillips or with a wrench.
Take apart loose joints with rubber mallet.
Wood shrinks over time and this aging process weakens the joints.
If the clamp slides off fasten it over a strip of rubber to improve the grip or try the pvc pipe method below.