1. Introduction
Thank you for choosing the BASETBL Office Chair F051. This ergonomic swivel chair is designed to provide comfort and support for extended periods of use. It features a wide synthetic leather seat, an adjustable high backrest, and a convenient footrest. This chair complies with EN12520 standards, ensuring quality and safety. Please read this manual thoroughly before assembly and use to ensure proper function and longevity of your chair.
Safety Warning: The maximum load capacity for this chair is 200 kg (440 lbs).
2. Package Contents
Before beginning assembly, please ensure all components are present and undamaged. If any parts are missing or damaged, contact customer service.
- Backrest
- Seat Cushion with Footrest
- Armrests (Left and Right)
- Gas Lift Cylinder
- Base (Star Base)
- Casters (5 pieces)
- Mechanism Plate
- Headrest
- Lumbar Pillow
- Hardware Kit (Screws, Allen Key, Washers)
3. Setup and Assembly Instructions
Assembly typically takes 15-20 minutes. All necessary tools are included in the hardware kit. Follow these steps carefully.
3.1. Attach Casters to Base
- Insert each of the five casters into the holes at the end of each leg of the star base. Push firmly until they click into place.
3.2. Install Gas Lift Cylinder
- Place the gas lift cylinder into the center hole of the assembled star base.
3.3. Attach Mechanism Plate to Seat
- Align the mechanism plate with the pre-drilled holes on the underside of the seat cushion.
- Secure the mechanism plate using the provided screws and Allen key. Ensure all screws are tightened securely.
3.4. Attach Armrests to Seat and Backrest
- Attach the armrests to the sides of the seat cushion using the designated screws. Do not fully tighten yet.
- Align the backrest with the armrests and the seat. Secure the backrest to the armrests using the remaining screws.
- Once all screws are in place, tighten all armrest and backrest screws firmly.
3.5. Attach Headrest
- Slide the headrest into the designated slots at the top of the backrest. Adjust to your preferred height.
3.6. Connect Seat Assembly to Gas Lift
- Carefully place the assembled seat and backrest onto the gas lift cylinder, ensuring the center hole of the mechanism plate aligns with the top of the gas lift.
- Press down firmly on the seat to secure it to the gas lift.
Figure 1: Overview of chair dimensions and key components. Ensure the three screws connecting the seat and backrest are tightened to prevent shifting.
Figure 2: Key features including silent PU casters for floor protection, SGS and TUV certified gas lift, 200kg load capacity, and 10cm height adjustment range (suitable for users 160-190 cm).
4. Operating Instructions and Adjustments
Your BASETBL office chair offers several adjustable features to customize your seating experience.
4.1. Seat Height Adjustment
- Locate the lever on the right side, under the seat.
- To raise the seat: Lift the lever while taking your weight off the seat. The seat will rise automatically.
- To lower the seat: Lift the lever while remaining seated. The seat will lower.
- Release the lever to lock the seat at the desired height (range: 45-55 cm).
4.2. Backrest Recline and Rocking Function
- The chair features a rocking function that can be locked at any angle between 90° (upright) and 120° (reclined).
- To recline: Pull the lever on the left side, under the seat, outwards. Lean back to the desired angle. Push the lever inwards to lock the backrest position.
- To unlock and rock: Pull the lever outwards. The chair will now allow rocking motion.
4.3. Tilt Tension Adjustment
- The round knob located under the front of the seat controls the tilt tension.
- Turn clockwise to increase tension (making it harder to recline).
- Turn counter-clockwise to decrease tension (making it easier to recline).
4.4. Headrest Adjustment
- The headrest can be adjusted vertically by sliding it up or down within its slots (range: 9 cm).
- Adjust it to support your neck and head comfortably.
4.5. Footrest Operation
- To extend the footrest: Pull the footrest handle located under the front of the seat. The footrest will slide out.
- To retract the footrest: Push the footrest back under the seat until it is fully stored.
Figure 3: Demonstrates the chair's recline function (90° for work, 120° for relaxation/napping) and the tilt tension adjustment knob. A lumbar pillow is also shown.
Figure 4: Illustrates the 9 cm adjustable height of the headrest, designed to be extra wide and comfortable for optimal neck support.
5. Maintenance and Care
Proper maintenance will extend the life and appearance of your BASETBL office chair.
- Cleaning: Wipe the synthetic leather surfaces with a soft, damp cloth. For stubborn stains, use a mild soap solution and then wipe with a clean, damp cloth. Avoid harsh chemicals or abrasive cleaners.
- Inspection: Periodically check all screws and bolts to ensure they are tight. Re-tighten if necessary to maintain stability and safety.
- Casters: Keep the casters clean from hair and debris to ensure smooth movement.
- Avoid Overloading: Do not exceed the maximum weight capacity of 200 kg (440 lbs).
- Sunlight Exposure: Avoid prolonged direct sunlight exposure to prevent fading and material degradation.
6. Troubleshooting
If you encounter any issues with your chair, refer to the following common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Chair does not rise or lower | Gas lift cylinder malfunction or lever not engaged. | Ensure the height adjustment lever is fully engaged. If the problem persists, the gas lift may need replacement. Contact customer service. |
| Chair is wobbly | Loose screws or improper assembly. | Check and tighten all assembly screws, especially those connecting the seat, backrest, and armrests. Ensure the base is securely attached to the gas lift. |
| Casters do not roll smoothly | Debris caught in casters or damaged casters. | Remove any hair or debris from the caster wheels. If casters are damaged, they may need replacement. |
| Backrest does not recline or lock | Recline mechanism issue or tension too high. | Ensure the recline lock lever is disengaged. Adjust the tilt tension knob counter-clockwise to reduce tension. |
| Footrest is difficult to extend/retract | Mechanism obstruction or lack of lubrication. | Check for any obstructions. Apply a small amount of silicone lubricant to the sliding mechanism if needed. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | DECHAF051B |
| Brand | BASETBL |
| Dimensions (L x W x H) | 66 x 70 x 120 cm (26 x 27.6 x 47.2 inches) |
| Weight | 22.5 kg (49.6 lbs) |
| Maximum Load Capacity | 200 kg (440 lbs) |
| Seat Height Adjustment | 45-55 cm (17.7-21.7 inches) |
| Headrest Adjustment | 9 cm (3.5 inches) vertical |
| Recline Angle | 90° to 120° (lockable) |
| Materials | Metal frame, Synthetic Leather upholstery, Foam filling |
| Casters | 360° Swivel, Silent, Abrasion-resistant PU |
| Gas Lift | SGS and TUV certified Class 4 |
| Compliance | EN12520 Standard |
Figure 5: Illustrates the chair's robust design, capable of supporting up to 200 kg, making it suitable for a wide range of users.
Figure 6: Cross-section of the seat cushion, detailing its construction with skin-friendly PU leather, natural sponge, spring core padding, and a natural wood board for durability and comfort. It also shows pressure distribution comparison between spring and non-spring cushions.
8. Warranty and Support
BASETBL is committed to providing high-quality ergonomic chairs and customer service.
- Warranty: This product comes with a 3-year warranty. This warranty covers manufacturing defects and material failures under normal use.
- Customer Service: For any questions, concerns, or warranty claims, please contact BASETBL customer service. We aim to respond to all inquiries within 24 hours.
- Contact Information: Please refer to the product packaging or the official BASETBL website for the most current customer service contact details.
