LONGBOSS LBS-2810 Ergonomic Office Chair Instruction Manual

1. Introduction

Thank you for choosing the LONGBOSS LBS-2810 Ergonomic Office Chair. This manual provides essential information for the proper assembly, operation, and maintenance of your new chair. Please read these instructions carefully before use to ensure safe and optimal performance.

Image 1.1: Front view of the LONGBOSS LBS-2810 Ergonomic Office Chair, showcasing its mesh back, double seat cushion, and adjustable armrests.

2. Safety Information

• The maximum weight capacity for this chair is 350 lbs (158 kg). Do not exceed this limit.
• Ensure all screws and bolts are securely tightened before use. Periodically check and re-tighten as necessary.
• Follow instructions for safe operation of all adjustable mechanisms, including tilt and lock functions, to prevent injuries.
• Avoid standing on the chair or using it as a step stool.
• Keep hands and fingers clear of moving parts during adjustments.
• Use the chair on a flat, stable surface.

3. Package Contents

Please verify that all components are present before beginning assembly:

• Seat Assembly (with double cushion)
• Backrest Assembly (with mesh back and lumbar support)
• Armrests (2)
• Gas Lift Cylinder
• Star Base
• Casters (5)
• Hardware Kit (screws, washers, Allen wrench)
• Instruction Manual

4. Assembly Instructions

Assembly typically takes 20-30 minutes. It is recommended to assemble the chair on a soft, clean surface to prevent damage. Refer to the detailed diagrams in the included paper manual for step-by-step guidance.

Assembly Overview Video

General Assembly Steps:

1. Insert the casters into the holes at the end of each leg of the star base.
2. Place the gas lift cylinder into the center hole of the star base.
3. Attach the armrests to the seat assembly using the provided screws. Ensure they are oriented correctly.
4. Attach the backrest to the seat assembly using the provided screws.
5. Carefully place the assembled seat and backrest onto the gas lift cylinder.

5. Operating Instructions (Adjustments)

The LONGBOSS LBS-2810 chair offers several adjustments to customize your seating experience.

5.1 Seat Height Adjustment

To adjust the seat height, pull the lever located under the right side of the seat upwards. While holding the lever, stand up to raise the seat or remain seated to lower it. Release the lever to lock the height.

5.2 Armrest Height Adjustment

The armrests are height adjustable by 2.76 inches. Locate the button on the side of each armrest support. Press the button and simultaneously move the armrest up or down to your desired height. Release the button to lock it in place.

5.3 Backrest Tilt and Lock Function

The chair features an 18-degree tilt function. To recline, pull the lever located under the left side of the seat outwards. To lock the backrest in an upright position, push the lever inwards. The tension of the tilt can be adjusted by turning the round knob located under the front of the seat.

5.4 360-Degree Swivel

The chair is designed to rotate 360 degrees, allowing for easy movement and access within your workspace.

Image 5.1: Visual guide demonstrating the adjustable seat height, armrest height, and backrest angle of the office chair.

5.5 Ergonomic Support

The chair is designed with ergonomic principles to protect your waist and spine during prolonged sitting. The mesh back provides breathable lumbar support.

Image 5.2: Diagram highlighting the back and lumbar support features designed for ergonomic comfort.

5.6 Double Seat Cushion

The double seat cushion is designed for increased width and depth, providing enhanced comfort and durability without the need for additional cushions.

Image 5.3: An exploded view illustrating the components of the double seat cushion, including styling sponge, 3D seat cushion, and seat plate.

6. Maintenance

• Cleaning: Wipe the chair's surfaces with a soft, damp cloth. For fabric areas, use a mild upholstery cleaner if necessary. Avoid harsh chemicals or abrasive materials.
• Casters: The silent PU wheels are designed for durability. Keep them free of hair and debris to ensure smooth movement.
• Hardware: Periodically check all screws and bolts to ensure they remain tight. Re-tighten as needed to maintain stability and safety.
• Gas Lift: The gas lift cylinder is tested for 120,000 cycles. Avoid excessive force or tampering with the mechanism.

7. Troubleshooting

• Chair Squeaks: Check and tighten all assembly bolts. A small amount of silicone spray on moving metal parts (avoiding the gas lift) may help.
• Seat Height Not Adjusting: Ensure the gas lift lever is fully engaged. If the issue persists, the gas lift cylinder may need replacement.
• Backrest Not Tilting/Locking: Verify the tilt lever is correctly positioned. Check the tension knob under the seat; loosen it for easier tilting.
• Wobbly Chair: Ensure all bolts are securely tightened, especially those connecting the seat, back, and armrests to the mechanism.

8. Specifications

Image 8.1: Detailed product dimensions including seat width, back height, and overall chair height range.

9. Warranty and Support

Your LONGBOSS LBS-2810 Ergonomic Office Chair is covered by a 12-month warranty from the date of purchase. This warranty covers manufacturing defects and material flaws under normal use.

For warranty claims, technical support, or replacement parts, please contact LONGBOSS customer service through your original point of purchase or visit the official LONGBOSS website for contact information.

Please retain your proof of purchase for warranty validation.