1. Introduction
Thank you for choosing the Yaheetech Ergonomic Office Chair. 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.
Image: The Yaheetech Ergonomic Office Chair, featuring a mesh back, adjustable headrest, and flip-up armrests, positioned in a contemporary office environment.
2. Safety Information
- Maximum Weight Capacity: This chair is designed to support a maximum weight of 136 kg (300 lbs). Do not exceed this limit.
- Do Not Stand on the Chair: Standing on the chair can lead to injury and damage the product.
- Assembly: Always follow the assembly instructions provided. Ensure all screws and bolts are securely tightened before use.
- Regular Checks: Periodically check all fasteners to ensure they remain tight.
- Children: Keep children away from the assembly area. Small parts may be a choking hazard.
- Intended Use: This chair is intended for office and relaxing use. Do not use it for purposes other than its intended design.
3. Package Contents
Verify that all components are present before beginning assembly. If any parts are missing or damaged, please contact customer support.
- Seat Cushion
- Backrest with Mesh
- Headrest
- Armrests (2)
- Gas Lift Cylinder
- Star Base
- Casters (5)
- Mechanism Plate
- Hardware Pack (screws, washers, Allen wrench)
4. Assembly Instructions
Follow these steps to assemble your Yaheetech Ergonomic Office Chair. It is recommended to assemble the chair on a soft, clean surface to prevent damage.
- Attach Casters to Base: Insert the five casters into the holes at the end of each leg of the star base. Push firmly until they click into place.
- Insert Gas Lift: Place the gas lift cylinder into the center hole of the star base.
- Attach Mechanism to Seat: Align the mechanism plate with the screw holes on the underside of the seat cushion. Ensure the front of the mechanism faces the front of the seat. Secure with screws using the provided Allen wrench.
- Attach Armrests to Seat: Secure the armrests to the sides of the seat cushion using the designated screws.
- Attach Backrest to Seat/Mechanism: Connect the backrest to the seat and/or mechanism plate using the appropriate screws. Ensure a secure fit.
- Attach Headrest: Slide the headrest into the designated slots at the top of the backrest.
- Connect Seat Assembly to Gas Lift: Carefully place the assembled seat onto the gas lift cylinder, ensuring it is centered and fully seated.
5. Operating Instructions
Your Yaheetech Ergonomic Office Chair offers several adjustment features to customize your seating experience.
5.1 Seat Height Adjustment
Image: A close-up of the chair's underside, illustrating the lever for seat height adjustment and the knob for tilt tension control. The seat height lever can also lock the rocking function.
To adjust the seat height, locate the lever on the right side under 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.
5.2 Tilt Function and Tension Control
The same lever used for seat height can also lock or unlock the chair's rocking function. Push the lever in to lock the backrest in an upright position, or pull it out to allow the chair to recline.
To adjust the tilt tension, turn the round knob located under the seat (as shown in the image above). Turn clockwise to increase tension (making it harder to recline) or counter-clockwise to decrease tension (making it easier to recline).
5.3 Adjustable Armrests
Image: The chair's armrests can be flipped up by 90 degrees, allowing the chair to be pushed closer to a desk or used as an armless chair.
The armrests on this chair can be flipped up by 90 degrees. This feature allows you to push the chair closer to your desk or convert it into an armless chair for more flexibility.
5.4 Headrest and Lumbar Support Adjustment
Image: A composite image highlighting the adjustable headrest, flexible lumbar support, flip-up armrests, adjustable balance function, and adjustable seat height, all contributing to the chair's ergonomic design.
The headrest is height-adjustable. Gently push or pull the headrest up or down to find your preferred position for neck and head support.
The flexible lumbar support can be adjusted to provide optimal support for your lower back. Adjust it to match the natural curve of your spine.
Image: An illustration detailing the ergonomic design of the chair, emphasizing support for the head, shoulders (mesh back for breathability), adjustable lumbar area, and forearms.
6. Maintenance
- Cleaning: Wipe the chair with a soft, damp cloth. For mesh and fabric parts, use a mild soap solution if necessary, and then wipe with a clean, damp cloth. Avoid harsh chemicals or abrasive cleaners.
- Caster Care: Periodically clean hair and debris from the casters to ensure smooth movement.
- Fastener Check: Every few months, check all screws and bolts to ensure they are tight. Re-tighten if necessary to maintain stability and safety.
- Avoid Direct Sunlight: Prolonged exposure to direct sunlight can cause fading and material degradation.
7. Troubleshooting
- Chair Squeaks: Check all screws and bolts for tightness. Apply a small amount of silicone lubricant to moving parts if the squeaking persists.
- Chair is Unstable: Ensure all casters are fully inserted into the base and all screws are tightened. Verify the gas lift is properly seated in the base and mechanism.
- Gas Lift Not Adjusting: Ensure the adjustment lever is fully engaged or disengaged. If the issue persists, the gas lift may need replacement. Contact customer support.
- Casters Not Rolling Smoothly: Clean any debris (hair, dust) from the caster wheels. If damaged, casters may need replacement.
8. Specifications
Image: Technical drawing displaying the various dimensions of the office chair, including overall height, width, seat depth, and armrest height, along with recommended user height and weight capacity.
| Feature | Detail |
|---|---|
| Materials | Polyester mesh, foam, plywood, nylon, plastic, iron |
| Overall Dimensions (with headrest) | 66L × 62W × 122-132H cm (25.98"D x 24.41"W x 48.03"-51.97"H) |
| Seat Size | 51 cm wide x 50 cm deep (20.08"W x 19.69"D) |
| Adjustable Seat Height | 47.5-56.5 cm (18.7"-22.24") |
| Armrest to Floor Height | 66-75.5 cm (25.98"-29.72") |
| Maximum Weight Capacity | 136 kg (300 lbs) |
| Item Weight | 11.5 kg (25.3 lbs) |
| Color | Grey |
| Back Style | Mesh Back |
| Special Features | Ergonomic, Head Support, Rolling, Swivel, Adjustable Armrest, Adjustable Headrest, Adjustable Lumbar Support |
9. Warranty and Support
For warranty information or technical support, please refer to the documentation included with your purchase or contact Yaheetech customer service directly. Contact details can typically be found on the manufacturer's official website or on your purchase receipt.
Please have your model number (99504737-decf-4836-ae40-3db794af450a) and proof of purchase ready when contacting support.
