My chair cannot be raised and lowered.

Because the height adjustment function requires the cooperation of the tilt mechanism and the gas cylinder to take effect, please try again after separating the gas cylinder and the tilt mechanism, and shake it after sitting on the chair to ensure that gas cylinder and the tilt mechanism are tightly combined. If the problem is still not solved after trying, please send the video that the chair cannot be raised or lowered to our after-sale mailbox. Our professional customer service will serve you