SIHOO Doro C300 Ergonomic Office Chair

1. Safety Information

Please read all safety instructions carefully before assembly and use. Keep this manual for future reference.

• Weight Limit: Do not exceed the maximum recommended weight of 150 kilograms (approximately 330 pounds) on this chair.
• Stable Surface: Always use the chair on a flat, stable surface to prevent tipping.
• Children and Pets: Keep children and pets away from the chair during assembly.
• Proper Use: Use the chair only for its intended purpose as an office chair. Avoid standing on the chair or using it as a ladder.
• Regular Checks: Periodically check all bolts and screws to ensure they are tight. Retighten if necessary.

2. Setup and Assembly

The SIHOO Doro C300 chair is designed for straightforward assembly. All necessary tools are typically included. It is recommended to assemble the chair on a soft, clean surface to prevent damage.

Assembly Steps:

1. Unpack Components: Carefully remove all parts from the packaging and lay them out. Verify all components are present against the parts list (usually found in the included manual).
2. Attach Casters to Base: Insert the casters (wheels) into the holes at the end of each leg of the chair base. Push firmly until they click into place.
3. Insert Gas Lift: Place the gas lift cylinder into the center hole of the assembled chair base.
4. Attach Mechanism to Seat: Secure the control mechanism to the underside of the seat cushion using the provided screws. Ensure the front of the mechanism aligns with the front of the seat.
5. Connect Armrests: Attach the armrests to the seat cushion using the designated screws.
6. Attach Backrest: Connect the backrest to the seat assembly. Ensure proper alignment and secure with screws.
7. Install Headrest: Slide the headrest into its designated slot at the top of the backrest.
8. Connect Seat to Gas Lift: Carefully place the assembled seat and backrest onto the gas lift cylinder, ensuring it is centered and stable.

Figure 2.1: Fully assembled SIHOO Doro C300 chair.

Figure 2.2: Chair dimensions for reference during assembly and setup.

3. Operating Instructions and Adjustments

The SIHOO Doro C300 offers multiple adjustment features to customize your seating experience for optimal ergonomic support and comfort.

3.1. Headrest Adjustment

The 3D mechanical headrest can be adjusted to support your head and neck, reducing muscle fatigue. It allows for 4.5cm up and down movement, 6.5cm back and forth adjustment, and a 20° angle tilt.

Figure 3.1: Adjusting the 3D Mechanical Headrest.

3.2. Lumbar Support

The chair features a self-adaptive dynamic lumbar support system that automatically adjusts to your back's curvature as you move, providing continuous support and eliminating gaps between your back and the chair.

Figure 3.2: Dynamic Lumbar Support in action.

3.3. Armrest Adjustment

The 4D coordinated armrests offer multiple directions for adjustment, allowing you to find the perfect position to reduce strain on your arms and wrists during long periods of sitting. Adjustments include up/down, back/forth, inward/outward rotation, and coordination when reclining.

Figure 3.3: 4D Armrest Adjustment options.

3.4. Recline and Tilt Function

The intelligent gravity mechanism allows for automatic adjustment of resilience based on your weight. The chair offers a 2-step auto-adjustment function and can be tilted up to 20 degrees, with fixed positions at 92°, 100°, and 112° for various activities from focused work to relaxation.

Figure 3.4: Recline function for extended comfort.

3.5. Seat Adjustment

The seat features a waterfall-shaped cushion and pressure-relieving seating design, which supports leg circulation and reduces hip pressure for comfort throughout the day.

Figure 3.5: Seat cushion design for comfort.

4. Maintenance

Proper maintenance will ensure the longevity and continued performance of your SIHOO Doro C300 office chair.

• Cleaning: Wipe clean with a damp cloth. Avoid harsh chemicals or abrasive cleaners that could damage the mesh or plastic components.
• Regular Inspection: Periodically inspect all moving parts, screws, and connections. Tighten any loose fasteners to maintain stability and safety.
• Mesh Care: The premium mesh upholstery is designed for durability and airflow. Avoid sharp objects that could snag or tear the mesh.

5. Troubleshooting

If you encounter any issues with your SIHOO Doro C300 chair, please refer to the following common solutions or contact customer support.

• Squeaking Noises: If the chair makes squeaking noises, check all bolts and screws for tightness and retighten if necessary. A small amount of silicone lubricant can be applied to moving metal parts if the noise persists.
• Instability/Wobbling: Ensure the chair is on a level surface. Check that the gas lift is properly seated in the base and that all connections are secure.
• Adjustment Issues: If an adjustment mechanism is not working smoothly, ensure no obstructions are present and that the mechanism is clean. Do not force adjustments.

For issues not covered here, please contact SIHOO customer support.

6. Specifications

7. Warranty and Support

SIHOO is committed to providing high-quality products and excellent customer service.

• Warranty: This SIHOO chair comes with a three-year warranty from the date of purchase. This covers defects, deficiencies, or uncertainties in the product.
• Returns: Enjoy 30-day easy returns if you are not satisfied with your purchase.
• Customer Support: For any inquiries, assistance, or warranty claims, please contact SIHOO customer support. Response is typically within 24 hours.
• User Guide: A detailed User Guide in PDF format is available for download: Download User Guide (PDF)
• Visit the SIHOO Store: Explore more products and information from SIHOO: SIHOO Amazon Store