Introduction
This manual provides instructions for the assembly, operation, maintenance, and troubleshooting of your FAMSINGO Ergonomic Mesh Office Chair, Model FS-803. Please read this manual thoroughly before assembly and use to ensure proper function and longevity of your chair.
Safety Information
- Ensure all components are securely fastened before use.
- Do not stand on the chair.
- Do not use the chair if any parts are damaged or missing.
- Keep children away from moving parts during adjustment.
- Maximum weight capacity: 136 kg (300 lbs). Do not exceed this limit.
Package Contents
Verify that all components are present before beginning assembly. If any parts are missing or damaged, contact customer support.
- Backrest assembly
- Seat cushion assembly
- Armrests (2)
- Headrest
- Gas lift cylinder
- Star base
- Casters (5)
- Mechanism plate
- Hardware kit (screws, washers, Allen wrench)
- Assembly instructions
Assembly Instructions
Follow the included step-by-step assembly instructions and video (if provided) for a smooth setup process. Typically, assembly involves attaching the casters to the base, inserting the gas lift, securing the mechanism to the seat, attaching the armrests, and finally connecting the backrest and headrest.
For visual guidance, refer to the general product image below, which illustrates the fully assembled chair.

Adjustments and Operation
Your FAMSINGO office chair offers multiple adjustment features to customize your seating experience for optimal comfort and support.
1. Seat Height Adjustment
To adjust the seat height, locate the lever under the right side of the seat. Pull the lever up while seated to lower the seat, or pull the lever up while standing to raise the seat. Release the lever at the desired height.

2. Rocking Function and Tension
The chair features a rocking function. To engage or disengage the rocking, use the lever located under the seat (often the same lever as height adjustment, pushed in or pulled out). To adjust the rocking tension, turn the round knob located under the front of the seat. Turn clockwise to increase tension (requiring more force to recline) and counter-clockwise to decrease tension.

3. Adjustable Lumbar Support
The adaptive ergonomic lumbar support can be adjusted vertically within a 7.6 cm range. Gently push or pull the lumbar support section on the backrest to move it up or down to your preferred position.

4. 3D Adjustable Armrests
The armrests offer 3-dimensional adjustments:
- Flip-up: The armrests can be flipped up to allow the chair to slide further under a desk, saving space.
- Front & Back: Adjust the armrest pads forward or backward.
- In & Out: Adjust the armrest pads inward or outward.

5. 2D Adjustable Headrest
The headrest can be adjusted in two dimensions:
- Up-Down Adjustment: Slide the headrest up or down to align with your neck and head.
- Tilt Angle: Adjust the angle of the headrest for optimal support.

Care and Maintenance
- Cleaning: For general cleaning, wipe the chair with a soft, damp cloth. For deeper cleaning, dry cleaning is recommended for the fabric components. Avoid harsh chemicals or abrasive cleaners.
- Mesh Fabric: The breathable mesh is wear-resistant and easy to clean. Use a soft brush or vacuum cleaner to remove dust and debris.
- Casters: Periodically check the casters for hair or debris that may impede smooth movement. Clean as necessary. The polyurethane casters are designed to be smooth and silent on various floor surfaces.
- Hardware: Regularly check all screws and bolts to ensure they are tight. Retighten if necessary to maintain stability.

Troubleshooting
- Issue: Chair does not adjust height.
- Solution: Ensure the gas lift lever is fully engaged. Check if the gas lift cylinder is properly installed and not damaged. Contact support if the gas lift is faulty.
- Issue: Chair is wobbly or unstable.
- Solution: Check all assembly screws and bolts. Tighten any loose connections. Ensure the star base is fully seated on the gas lift.
- Issue: Casters are not rolling smoothly.
- Solution: Inspect casters for trapped hair, dust, or debris. Clean them thoroughly. Ensure casters are fully inserted into the star base.
- Issue: Rocking function is too stiff or too loose.
- Solution: Adjust the rocking tension knob located under the front of the seat. Turn clockwise to increase tension, counter-clockwise to decrease.
Specifications
| Feature | Detail |
|---|---|
| Model Number | FS-803 |
| Brand | FAMSINGO |
| Overall Dimensions (L x W x H) | 58.42 x 72.39 x 130.05 cm (23 x 28.5 x 51.2 inches) |
| Seat Dimensions (W x D) | 57.1 x 53.3 cm (22.5 x 21 inches) |
| Backrest Dimensions (W x H) | 49.5 x 63.5 cm (19.5 x 25 inches) |
| Weight Capacity | 136 kg (300 lbs) |
| Item Weight | 15.88 kg (35 lbs) |
| Material | Nylon Mesh (backrest), Memory Foam (seat), Nylon (frame) |
| Color | Black |
| Special Features | Adjustable Headrest (2D), Adjustable Lumbar Support, Ergonomic Design, Reclinable, Memory Foam Seat, 3D Flip-up Armrests, Silent Casters |
| Recommended Use | Office, Home Office |
| Caster Material | Polyurethane |

Warranty and Support
The FAMSINGO Ergonomic Mesh Office Chair comes with a 2-year warranty from the date of purchase, covering manufacturing defects. This warranty does not cover damage caused by misuse, accidents, or unauthorized modifications.
For any questions, concerns, or warranty claims, please contact FAMSINGO customer service. Our team aims to provide a satisfactory response within 24 hours.
Customer Service Contact: Please refer to your purchase documentation or the FAMSINGO official website for the most current contact information.