1. Introduction
Thank you for choosing the WOLTU Ergonomic Office Chair BS161. This manual provides essential information for the safe assembly, operation, and maintenance of your new office chair. Please read these instructions carefully before use and retain them for future reference.
Safety Information
- Do not exceed the maximum weight capacity of 150 kg (330 lbs).
- Ensure all components are correctly assembled and securely tightened before use.
- Use the chair on a stable and level surface to prevent tipping.
- Exercise caution when adjusting the chair's mechanisms while seated to avoid injury.
- Keep hands and fingers clear of moving parts during adjustment.
- This chair is designed for adult use. Keep children away from the chair during assembly and adjustment.
2. Package Contents
Before beginning assembly, please verify that all parts are present and undamaged. The package should contain:
- Office Chair Components (Backrest, Seat, Armrests, Base, Wheels, Gas Lift)
- Accessory Kit (Screws, Washers, Allen Key)
- Assembly Instructions (this manual)
If any parts are missing or damaged, please contact WOLTU customer service for assistance.
3. Assembly Instructions
Follow these steps carefully to assemble your WOLTU Ergonomic Office Chair. An illustrated guide is included in the package for visual reference.
- Attach Wheels to Base: Insert the five caster wheels into the holes at the end of each leg of the chair base. Push firmly until they click into place.
- Insert Gas Lift: Place the gas lift cylinder into the central hole of the assembled chair base. Ensure it sits securely.
- Attach Armrests to Seat: Secure the armrests to the underside of the seat cushion using the provided screws and Allen key. Pay attention to the 'L' (left) and 'R' (right) markings if present.
- Attach Backrest to Seat: Align the backrest with the mounting points on the seat mechanism. Secure it with the appropriate screws.
- Attach Seat Assembly to Gas Lift: Carefully place the assembled seat and backrest onto the gas lift cylinder. The tapered end of the gas lift should fit into the central mechanism under the seat.
- Attach Headrest: Slide the headrest into the designated slots at the top of the backrest. Ensure it is securely seated.


4. Operating Instructions
Your WOLTU Ergonomic Office Chair BS161 offers multiple adjustment options to customize your seating experience for optimal comfort and support.
4.1. Seat Height Adjustment
To adjust the seat height (up to 8 cm range), locate the lever on the right side beneath the seat. While seated, pull the lever up to lower the seat. To raise the seat, stand up slightly and pull the lever up. Release the lever at your desired height.

4.2. Backrest Recline Adjustment
The backrest can be continuously reclined between 90° and 110° and features a double safety lock. To recline, pull the recline lever (usually on the left side) and lean back. Release the lever to lock the backrest in your preferred position. To return to an upright position, lean forward slightly while pulling the lever.

4.3. Headrest Adjustment
The headrest is adjustable by 30° and has an 8 cm height range. To adjust the angle, gently tilt the headrest forward or backward. To adjust the height, grasp the headrest and slide it up or down to your desired position.

4.4. Armrest Adjustment
The armrests are foldable and offer 3D adjustment (up/down, forward/backward, rotating). To fold them up, simply lift them. For other adjustments, locate the buttons or levers on the armrests and manipulate them to achieve your desired position.

4.5. Lumbar Support Adjustment
The dynamic adjustable lumbar support is designed to conform to the curve of your spine. While seated, you can gently push or pull the lumbar support area to find the most comfortable position for your lower back.

5. Maintenance
Proper care and maintenance will extend the life of your WOLTU Ergonomic Office Chair.
- Cleaning: Wipe the chair surfaces with a soft, damp cloth. For stubborn stains on the mesh or fabric, use a mild soap solution and then wipe clean with a dry cloth. Avoid harsh chemicals or abrasive cleaners.
- Inspection: Periodically check all screws and bolts to ensure they are tight. Re-tighten if necessary.
- Casters: Keep the caster wheels clean and free of debris (hair, dust) to ensure smooth movement.
- Avoid Overloading: Do not place excessive weight on the chair or use it for purposes other than intended seating.
6. Troubleshooting
If you encounter any issues with your chair, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Chair wobbles or feels unstable | Loose screws; uneven floor | Check and tighten all assembly screws. Ensure the chair is on a flat surface. |
| Seat height adjustment not working | Gas lift malfunction; lever mechanism jammed | Ensure the lever is fully engaged. If the issue persists, the gas lift may need replacement. Contact customer service. |
| Casters not rolling smoothly | Debris in casters; damaged casters | Clean any hair or debris from the caster wheels. If damaged, casters may need replacement. |
| Backrest does not recline or lock | Recline mechanism jammed; lever not engaged | Check the recline lever for obstructions and ensure it is fully engaged. |
If these solutions do not resolve the issue, please contact WOLTU customer service for further assistance.
7. Specifications
Below are the technical specifications for the WOLTU Ergonomic Office Chair BS161:
| Feature | Detail |
|---|---|
| Brand | WOLTU |
| Model Name | BS161 |
| Color | Grey |
| Material | Mesh Fabric (Backrest), Foam (Seat), Metal (Frame) |
| Product Dimensions (DxWxH) | 50P x 62l x 123.5H cm (19.7D x 24.4W x 48.6H inches) |
| Seat Height | Adjustable (46-54 cm / 18.1-21.3 inches) |
| Seat Depth | 50 cm (19.7 inches) |
| Backrest Height | 71 cm (28 inches) |
| Maximum Recommended Weight | 150 kg (330 lbs) |
| Special Features | Adjustable Height, Ergonomic, Adjustable Headrest, Reclining Chair, Adjustable Backrest |
| Assembly Required | Yes |
| Country of Origin | China |

8. Warranty Information
WOLTU provides a standard warranty for its products. For specific details regarding the warranty period and coverage for your BS161 Ergonomic Office Chair, please refer to the warranty card included in your product packaging or visit the official WOLTU website. Please retain your proof of purchase for any warranty claims.
9. Customer Support
If you have any questions, require technical assistance, or need to report a missing/damaged part, please contact WOLTU customer service. You can typically find contact information on the WOLTU official website or through the retailer where you purchased the product.
For online support, visit: WOLTU Store on Amazon