Introduction
Thank you for purchasing the SIHOO B300-PRO Ergonomic Office Chair. This manual provides detailed instructions for the assembly, operation, maintenance, and troubleshooting of your new chair. Please read this manual carefully before use to ensure proper function and longevity of the product. Keep this manual for future reference.
Safety Information
- Ensure all components are securely fastened before use.
- Do not stand on the chair or use it as a step stool.
- Avoid placing heavy objects on the chair that exceed its weight capacity.
- Keep hands and fingers clear of moving parts during adjustment.
- Use the chair on a flat, stable surface to prevent tipping.
- Regularly inspect the chair for loose screws or damaged parts. Discontinue use if any damage is found.
Package Contents
Before assembly, please verify that all parts are present and undamaged. If any parts are missing or damaged, contact customer support.
- Backrest assembly
- Seat cushion assembly
- Armrests (2)
- Gas lift cylinder
- Base
- Casters (5)
- Headrest
- Assembly hardware (screws, washers, tools)
- Instruction Manual
Setup and Assembly
Assembly is required for this chair. It typically takes about 30 minutes. We recommend assembling with two people for easier handling of certain parts, especially the lumbar support attachment.
- Attach Casters to Base: Insert each of the five casters into the holes at the end of each leg of the chair base until they click securely into place.
- Insert Gas Lift: Place the gas lift cylinder into the center hole of the assembled base.
- Attach Armrests to Seat: Secure the armrests to the underside of the seat cushion using the provided screws. Ensure they are oriented correctly.
- Attach Backrest to Seat: Align the backrest with the seat cushion and secure it using the designated screws.
- Place Seat Assembly on Gas Lift: Carefully place the assembled seat and backrest onto the gas lift cylinder, ensuring it is centered and stable.
- Attach Headrest: Slide the headrest into the designated slots at the top of the backrest.
For a visual guide to assembly and initial setup, please refer to the video below:
Video: SIHOO B300-PRO Assembly and Feature Overview. This video demonstrates the step-by-step assembly process and highlights key adjustable features of the chair.
Operating Instructions
The SIHOO B300-PRO chair offers extensive adjustability to customize your seating experience. All primary adjustments are conveniently located via levers under the seat.
1. Chair Height Adjustment
To adjust the chair height, locate the lever on the right side under the seat. Pull the lever upwards while seated to lower the chair, or pull it upwards while standing to raise the chair. Release the lever to lock the height. The chair features a 5-stage lift adjustment.
2. Recline Function and Lock
The chair's smart mechanism automatically adjusts recline resistance based on your body weight. To recline, lean back. To lock the recline angle, use the lever on the left side under the seat. The backrest can be locked in three positions: 110°, 123°, and 135°.
Image: The SIHOO B300-PRO chair allows for a deep recline up to 135 degrees, suitable for relaxation or napping.
3. Multi-Directional Lumbar Support
The lumbar support is designed to adapt to your spine's natural curve, providing support in various postures. It offers 4-way adjustment:
- Up/Down: Adjust the height of the lumbar support by sliding it vertically to match your lower back curve.
- Front/Back: Adjust the depth of the lumbar support to increase or decrease pressure on your lower back.
- Micro-Precision Adjustment: Fine-tune the support with 50mm vertical, 20mm horizontal, 10mm forward, and 3° left/right adjustments.
Image: The 4-way adaptive lumbar support adjusts to provide optimal comfort and spinal alignment across various sitting postures.
Image: Detailed view of the 4D micro-precision lumbar support, illustrating its extensive range of motion for personalized comfort.
4. 6D Linked Armrests
The 6D armrests provide comprehensive support for your arms and shoulders, moving in conjunction with the chair's recline. Adjustments include:
- Up/Down: Adjust the height of the armrests.
- Front/Back: Slide the armrest pads forward or backward.
- In/Out (Width): Adjust the distance between the armrests.
- Rotation: Pivot the armrest pads horizontally.
- Rebound: Allows for slight spring-back movement.
- Recline-Linked: Armrests move with the backrest when reclining.
Image: The 6D linked armrests offer versatile adjustments to support various arm and shoulder positions, including movement synchronized with recline.
5. 3D Bionic Wide Headrest
The headrest is designed to cradle your head and neck, supporting various resting positions. Adjustments include:
- Bracket Rotation: 20° rotation for optimal angle.
- Headrest Rotation: 45° rotation for fine-tuning support.
- Up/Down Slide: 11cm vertical adjustment to match your height.
Image: The 3D bionic wide headrest provides comprehensive head and neck support with multiple adjustment points.
6. 5-Stage Backrest Height Adjustment
The backrest height can be adjusted in 5 stages to ensure proper spinal support for users of different heights. To adjust, lift the backrest to the desired height until it locks into place.
Image: The 5-stage backrest height adjustment ensures consistent support for the entire back, regardless of user height.
7. 3-Stage Adjustable Seat Cushion
The 48.5cm wide seat cushion can be adjusted in 3 stages to suit different activities:
- Stage 1: Focused work
- Stage 2: Relaxed reading
- Stage 3: Napping/Rest
Use the lever to change the seat position freely.
Image: The adjustable seat cushion provides comfort and support for various activities, from intense work to relaxed reading.
For a comprehensive demonstration of the chair's adjustments and features, please watch the video below:
Video: SIHOO B300-PRO Detailed Adjustments. This video illustrates how to operate each adjustable feature of the chair, including height, recline, lumbar, armrests, and headrest.
Maintenance
Regular maintenance will help preserve the appearance and functionality of your SIHOO B300-PRO chair.
- Cleaning: For the mesh backrest and seat, gently wipe with a damp cloth and mild soap. Avoid harsh chemicals or abrasive cleaners. For plastic and metal parts, wipe with a soft, dry cloth.
- Inspection: Periodically check all screws and bolts to ensure they are tight. Re-tighten if necessary.
- Casters: Clean casters regularly to remove dust and debris that may hinder smooth movement.
- Gas Lift: Do not attempt to disassemble the gas lift cylinder. If it malfunctions, contact customer support.
Troubleshooting
If you encounter issues with your SIHOO B300-PRO chair, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Chair height adjustment not working | Gas lift cylinder malfunction or control wire issue. | Ensure the height adjustment lever is fully engaged. If the issue persists, the gas lift or its control mechanism may be faulty. Contact customer support for replacement parts or assistance. |
| Chair wobbles or feels unstable | Loose screws or uneven floor. | Check and tighten all assembly screws. Ensure the chair is on a flat, level surface. |
| Casters not rolling smoothly | Debris caught in casters. | Turn the chair over and remove any hair, dust, or debris from the caster wheels. |
| Backrest recline is too stiff or too loose | Recline tension not adjusted correctly. | The chair features an automatic weight-sensing recline resistance. If you experience issues, ensure the recline lock lever is disengaged. If problems persist, contact support. |
| Squeaking noises | Loose connections or friction between parts. | Tighten all screws. Apply a small amount of silicone lubricant to moving joints if necessary, avoiding contact with mesh fabric. |
Specifications
- Brand: SIHOO
- Model: B300-PRO (Model Numbers: B300-PRO-M102-JT, B300-PRO-JT-1)
- Color: Gray
- Material: Polypropylene, Mesh
- Product Dimensions (D x W x H): 72 cm x 73.5 cm x 110-135 cm (adjustable height)
- Seat Cushion Width: 48.5 cm
- Item Weight: 19.8 kg
- Reclining Stages: 3 (110°, 123°, 135°)
- Backrest Height Adjustment: 5 stages
- Lumbar Support: Multi-directional (4-way, 4D micro-precision)
- Armrests: 6D Linked
- Headrest: 3D Bionic Wide (20° bracket rotation, 45° headrest rotation, 11cm up/down slide)
- Included Components: Casters
- Country of Origin: China
Warranty and Support
The SIHOO B300-PRO chair comes with a 3-year quality guarantee. This warranty covers manufacturing defects and significant malfunctions under normal use. For warranty claims, technical support, or replacement parts, please contact SIHOO customer service through your purchase platform or the official SIHOO website. Please retain your proof of purchase for warranty validation.