A:
I have located the following information you can try, if this doesn't work the chair may be defective, in which case you have within 14 days for return or exchange:
Tilt Tension- Tilt tension is a great feature most office chairs possess that allows the user to control the rate and ease with which the chair reclines for different weights and strengths of users. This adjustment always comes in the form of a knob that is located directly underneath the seat. By twisting the knob one direction it will allow the user to lean back in the chair much easier and without much pressure. By twisting the knob the opposite direction, the user will have to exert more pressure into reclining back in their chair.
Tilt Lock - A tilt lock control locks out the tilt function when the chair is in the upright position. This feature is advantageous if you want the ability to recline in your chair for a few minutes but want to return it to lock in place in the upright position while tasking. Most office chairs that have tilt tension control will have tilt lock control as well. Tilt lock control is a lever on the chair that when pushed down allows you to recline in the chair, and when the lever is pulled up when your chair is in the upright position you are locked in place.
Answered on 4/16/2013 by Cindy from Staples