DUMOS Ergonomic Gaming Office Desk Chair

Introduction

Thank you for choosing the DUMOS Ergonomic Gaming Office Desk Chair. This manual provides detailed instructions for assembly, operation, and maintenance to ensure optimal performance and longevity of your chair. Please read this manual thoroughly before assembly and use.

Key Features:

• Upgraded Spring Cushioning: Features an innovative spring-loaded seat for even pressure distribution and high-density foam for resilience and comfort.
• Ergonomic Design: Back and cushion sides with wing-like support to balance pressure and provide maximum support, allowing for comfortable posture changes. Includes a stretchable footrest.
• Versatile Adjustability: Removable headrest and lumbar pillow, backrest adjustable from 90° to 135°, and seat height adjustable up to 3.9 inches with a durable 3-stage gas lift.
• Premium Materials: Durable PU leather, wear-resistant and crack-resistant. Upgraded 3-stage gas lift supports up to 275 pounds. 360° smooth-rolling rubber casters and sturdy metal base ensure stability and safety.
• Simple Assembly: Comprehensive online installation video and easy-to-follow steps with all necessary parts and detailed instructions included.

Safety Information

Always follow assembly instructions carefully. Do not exceed the maximum weight capacity of 275 pounds. Keep the chair away from water or damp conditions to prevent damage and ensure safety.

Product Dimensions

Figure 1: Product Dimensions and Maximum Weight Capacity.

The chair measures approximately 27 inches deep, 25 inches wide, and 52 inches high. It is designed to support a maximum weight of 275 pounds.

Package Contents

Before beginning assembly, please ensure all parts are present and undamaged. Refer to the diagram below for a visual representation of the components.

Figure 2: All components included in the DUMOS Gaming Chair package.

• Backrest (A) x1
• Seat (B) x1
• Headrest Pillow (C) x1
• Lumbar Pillow (D) x1
• Armrests (E) x2
• Footrest Pad (F) x1
• Footrest Frame (G) x1
• Base Connector (H) x2
• Chair Base Legs (I) x5
• Gas Lift Cylinder (J) x1
• Casters (K) x5
• Gas Lift Cover (L1) x1
• Base Center Piece (L2) x1
• Mechanism (M) x1
• Backrest Plate (N) x1
• Screws (O, P, Q, R, S, T) and Allen Wrench (U)

Assembly Instructions

Follow these steps carefully to assemble your DUMOS Gaming Chair. An online video guide is also available for visual assistance.

Assembly Video Guide:

1. Assemble the Chair Base: Attach the five chair base legs (I) to the base center piece (L2) using the provided screws (R). Ensure they are securely fastened.
2. Install Casters and Gas Lift: Insert the five casters (K) into the ends of the assembled chair base legs. Place the gas lift cylinder (J) into the center hole of the base, then cover it with the gas lift cover (L1).
3. Attach Mechanism to Seat: Secure the mechanism (M) to the underside of the seat (B) using screws (Q). Ensure the 'FRONT' label on the mechanism aligns with the front of the seat.
4. Attach Footrest: Secure the footrest frame (G) to the underside of the seat using screws (O). Then attach the footrest pad (F) to the footrest frame using screws (T).
5. Connect Seat to Base: Carefully place the assembled seat onto the gas lift cylinder, ensuring it is centered and stable.
6. Attach Backrest Plate: Secure the backrest plate (N) to the backrest (A) using screws (P).
7. Attach Backrest to Seat: Align the backrest plate with the corresponding holes on the seat mechanism. Secure the backrest to the seat using screws (Q).
8. Install Armrests: Attach the armrests (E) to the sides of the chair, connecting them to both the seat and the backrest using screws (S).
9. Attach Pillows: Secure the headrest pillow (C) and lumbar pillow (D) to the backrest using their adjustable straps.

Operating Instructions

Your DUMOS Gaming Chair offers multiple adjustment options for personalized comfort.

Adjusting the Chair:

Figure 3: Versatile Adjustability Features.

• Seat Height Adjustment: Use the smooth lift lever located under the seat on the right side to adjust the seat height. Pull the lever up to raise the seat; release to lock. To lower, pull the lever up while seated.
• Backrest Recline: The backrest can be adjusted from 90° (upright) to 135° (reclined). Use the recline lever on the side of the seat to set your desired angle.
• Retractable Footrest: Pull the footrest out from under the seat when you wish to recline and elevate your legs. Push it back in for storage.
• Headrest and Lumbar Pillows: Both pillows are removable and can be repositioned along the backrest to provide optimal support for your head and lower back.
• Linkage Armrests: The armrests are designed to move with the recline of the backrest, providing continuous support for your arms.

Ergonomic Support:

Figure 4: Ergonomic Support Zones.

The chair's design provides segmented support for your head, shoulders, waist, hips, and legs, helping to maintain the natural curve of your spine and reduce pressure during long periods of sitting.

Maintenance

To ensure the longevity and appearance of your DUMOS Gaming Chair, follow these simple care instructions:

• Cleaning: Wipe clean with a damp cloth. Avoid harsh chemicals or abrasive cleaners, as these can damage the PU leather.
• Inspection: Periodically 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 the PU leather to fade or crack.
• Weight Capacity: Do not exceed the maximum weight recommendation of 275 pounds.

Troubleshooting

If you encounter any issues with your chair, please refer to the following common solutions:

• Chair is Wobbly: Check all assembly screws and bolts. Ensure they are fully tightened. Make sure the chair is on a flat, even surface.
• Height Adjustment Not Working: Verify that the gas lift cylinder is correctly installed and not damaged. Ensure the lift lever is fully engaged when attempting to adjust height.
• Casters Not Rolling Smoothly: Check for any debris (hair, dust) caught in the casters. Clean them thoroughly. Ensure casters are fully inserted into the base legs.
• Backrest Not Reclining/Locking: Check the recline mechanism and lever for obstructions or damage. Ensure the lever is fully engaged to lock the backrest in place.

If problems persist after attempting these solutions, please contact DUMOS customer service for further assistance.

Specifications

Warranty and Support

DUMOS is committed to providing high-quality products. For any warranty claims, technical support, or questions not covered in this manual, please contact DUMOS customer service. Keep your purchase receipt for warranty purposes.