Introduction
Thank you for choosing the amseatec Ergonomic Office Desk Chair. This manual provides essential information for the safe assembly, operation, and maintenance of your new chair. Please read these instructions carefully before use and retain them for future reference.
Safety Information
- Ensure all components are present and undamaged before assembly. Do not use if any parts are missing or broken.
- Follow assembly instructions precisely. Incorrect assembly can lead to instability and potential injury.
- Do not stand on the chair. Use it only for sitting.
- Do not exceed the maximum weight capacity (not specified in data, but generally implied for office chairs).
- Keep children and pets away during assembly. Small parts may pose a choking hazard.
- Regularly check all bolts and screws to ensure they are tight. Retighten as necessary.
- Avoid exposing the chair to direct sunlight or extreme temperatures for prolonged periods, as this may damage the materials.
Package Contents
Verify that all the following components are included in your package:
- Mesh Backrest
- Mesh Seat
- Adjustable Armrests (Pair)
- Steel Gas Lift Cylinder
- Tilt Mechanism with Tension Control Knob
- Star Base
- Casters (5 pieces)
- Headrest
- Assembly Hardware (screws, washers, Allen wrench)
Setup and Assembly
Assembly is designed to be straightforward and can typically be completed within 30 minutes by one person. All necessary tools and parts are provided.
- Attach Casters to Base: Insert each of the five casters into the holes at the end of the star base until they click securely into place.
- Insert Gas Lift: Place the steel gas lift cylinder into the center hole of the star base.
- Attach Tilt Mechanism to Seat: Secure the tilt mechanism to the underside of the seat using the provided screws. Ensure the front of the mechanism aligns with the front of the seat.
- Attach Armrests: Fasten the adjustable armrests to the sides of the seat using the designated screws.
- Connect Backrest to Seat: Attach the backrest to the seat assembly, aligning the mounting points and securing with screws.
- Install Headrest: Slide the headrest into the top of the backrest until it is firmly in place.
- Assemble Chair onto Gas Lift: Carefully place the assembled seat and backrest onto the gas lift cylinder, ensuring it is centered and stable.


Operating Instructions
Your amseatec ergonomic chair offers multiple adjustment options to customize your seating experience for optimal comfort and support.
- Seat Height Adjustment: Locate the lever on the right side beneath the seat. Pull the lever up to raise the seat. While seated, pull the lever up to lower the seat. Release the lever to lock the height.
- Armrest Height Adjustment: Press the button located on the side of each armrest and slide the armrest up or down to your desired height. Release the button to lock.
- Headrest Adjustment: The headrest can be adjusted vertically (up/down) to provide optimal neck support. Gently push or pull the headrest to position it.
- Lumbar Support Adjustment: The lumbar support can be adjusted vertically (up/down) to align with the natural curve of your lower back. Gently push or pull the lumbar support mechanism on the backrest to adjust its position.
- Rocking Tilt Function: The chair features a 90–115° rocking tilt. Use the lever on the left side beneath the seat to engage or disengage the tilt. The tension control knob, usually located at the front center beneath the seat, allows you to adjust the resistance of the tilt mechanism. Turn clockwise to increase tension, counter-clockwise to decrease.



Maintenance
Proper maintenance ensures the longevity and performance of your amseatec office chair.
- Cleaning: Wipe clean with a damp cloth. Avoid harsh chemicals or abrasive cleaners, which can damage the mesh fabric or plastic components.
- Regular Inspection: Periodically check all screws, bolts, and connections to ensure they are tight. Retighten any loose fasteners to maintain stability and safety.
- Caster Care: Keep casters free of hair, dust, and debris to ensure smooth movement. Clean them regularly if needed.
- Gas Lift: The gas lift is a sealed unit and requires no maintenance. Do not attempt to disassemble it.
Troubleshooting
If you encounter any issues with your chair, refer to the following common solutions:
- Chair feels wobbly: Check all assembly screws and bolts. Ensure they are fully tightened. Verify that the gas lift is properly seated in the base.
- Chair does not adjust height: Ensure the height adjustment lever is fully engaged or disengaged. If the gas lift is faulty, it may need replacement.
- Casters not rolling smoothly: Inspect casters for debris (hair, lint, etc.) and clean them thoroughly.
- Tilt function not working: Check if the tilt lock lever is disengaged. Adjust the tilt tension knob to ensure it's not too tight or too loose.
If problems persist, please contact amseatec customer support for assistance.
Specifications
| Brand | amseatec |
| Model Name | LY-9025H-BLK-BLK (LY-9025) |
| Color | Blk-blk |
| Product Dimensions | 26.38"D x 26.77"W x 40.94"H |
| Seat Depth | 19.49 inches |
| Item Weight | 34.4 pounds |
| Special Features | Adjustable Backrest, Armrest & Headrest; Aerospace-Grade Frame; Butterfly Design; Triple Certified (BIFMA, SGS, TUV) |
| Included Components | Adjustable Armrests (Pair), Mesh Backrest, Mesh Seat, Steel Gas Lift Cylinder, Tilt Mechanism with Tension Control Knob |


Warranty and Support
Your amseatec Ergonomic Office Desk Chair is backed by a 5-Year Warranty, ensuring long-term support and peace of mind. This warranty covers manufacturing defects and significant functional issues under normal use.
For any questions, concerns, or warranty claims, please contact amseatec customer support. Refer to your purchase documentation for specific contact details or visit the official amseatec website.