How to Assemble an Office Chair

It is recommended to assemble the office chair from the bottom up, with the specific steps as follows:

1. Install the Chair Base and Gas Lift
   First, attach the casters (usually five in number) one by one to the chair base, ensuring that each wheel fits tightly into the base's interface to prevent looseness. After assembling the chair base, insert the gas lift vertically into the center hole of the base. The gas lift is the core component for adjusting the seat height, so it must be installed vertically and fit snugly with the base to prevent wobbling or tilting during subsequent use. Some tutorials mention that the top of the gas lift should face upwards in this step for easy connection to the seat plate later.

2. Secure the Seat Plate to the Seat
   Align the seat plate (the seat support structure) with the seat and fix them together using the provided screws (usually four long screws). Pay attention to the tightness of the screws during installation to avoid a loose seat that may wobble or overly tight screws that could damage the threads. Some seat plate designs may include adjustment knobs or buttons; ensure their positions match the seat's functions (such as tilt adjustment, height locking, etc.) before securing.

3. Connect the Backrest to the Seat
   Choose the appropriate installation method based on the connection type between the backrest and the seat:

   • For corner brace connections, align the corresponding holes on the backrest and seat, and secure the corner braces with screws (usually two to four screws).
   • For snap-fit designs, align the bottom of the backrest with the tray or slot on the seat and gently press down until you hear a 'click' sound, confirming that the snap-fit is fully engaged.
     Ensure that the angle between the backrest and seat conforms to ergonomic design (usually between 90° and 105°) to avoid improper installation that may affect comfort.

4. Assemble the Seat Assembly with the Gas Lift
   Insert the seat assembly (with the seat already fixed) vertically into the top of the gas lift, ensuring a complete fit at the connection point. Some gas lifts may have anti-slip designs at the top (such as rubber rings or grooves); confirm that the seat assembly is properly seated. After installation, gently shake the chair to check that the connections between the gas lift, seat assembly, and chair base are secure, with no looseness or unusual noises.

5. Install the Armrests and Headrest (if equipped)
   Finally, install the armrests and headrest (if included):

   • Armrests are usually fixed to the side frames of the seat with screws; use the provided screws (such as No. 3 screws) and install them according to the specified holes in the instructions. Some armrests support height or angle adjustments; adjust them to the appropriate position before securing.
   • For headrest installation, align its bracket with the slot or screw holes at the top of the backrest and secure it with snap-fits or screws. After installation, check that the headrest's adjustment functions (such as up-and-down sliding, angle rotation) are working properly.

Precautions: Read the instructions carefully before installation to confirm that all parts are included; avoid scratching the chair surface when using tools; if the screw holes do not align or connection is difficult, do not force assembly; instead, check if the parts match or contact after-sales service.