Flash Furniture Hercules Series GO-99-3-GG Big & Tall Ergonomic Mesh Office Chair Instruction Manual

Introduction

This manual provides essential information for the assembly, operation, maintenance, and troubleshooting of your Flash Furniture Hercules Series GO-99-3-GG Big & Tall Ergonomic Mesh Office Chair. Please read these instructions carefully before assembly and use to ensure proper function and longevity of your product.

Image 1: Front view of the Flash Furniture Hercules Series GO-99-3-GG Big & Tall Ergonomic Mesh Office Chair.

Safety Information

Ensure all parts are present and undamaged before assembly. Do not use if any parts are missing or damaged.
Follow assembly instructions precisely. Improper assembly can lead to instability and injury.
Do not stand on the chair.
Do not use the chair for purposes other than its intended use as an office chair.
Keep children away from the chair during assembly. Small parts may pose a choking hazard.
The maximum weight capacity for this chair is 500 pounds. Do not exceed this limit.

Package Contents

Before beginning assembly, verify that all components listed below are present in your package. Tools for assembly are typically included.

Seat Cushion
Backrest
Armrests (Left and Right)
Chair Base (Chrome)
Casters (5 pieces)
Gas Lift Cylinder
Cylinder Cover
Mechanism Plate
Hardware Pack (screws, washers, Allen wrench)

Setup and Assembly

Assembly typically takes approximately 60 minutes and requires the included tools. It is recommended to have a second person assist with certain steps, particularly when attaching the backrest to the seat and inserting the gas lift into the base.

Attach Casters to Base: Insert each of the five casters into the holes at the end of each spoke on the chair base. Push firmly until they click into place.
Insert Gas Lift: Place the gas lift cylinder into the center hole of the assembled chair base. Cover the gas lift with the cylinder cover.
Attach Mechanism Plate to Seat: Align the mechanism plate with the pre-drilled holes on the underside of the seat cushion. Ensure the front of the mechanism faces the front of the seat. Secure with the appropriate screws and washers from the hardware pack.
Attach Armrests to Seat: Attach the left and right armrests to the sides of the seat cushion using the designated screws. Do not fully tighten yet.
Attach Backrest to Seat and Armrests: Align the backrest with the mounting points on the seat and armrests. Secure the backrest to the seat using the provided screws. Then, secure the armrests to the backrest. Once all connections are made, fully tighten all screws for the armrests and backrest.
Connect Seat Assembly to Base: Carefully place the assembled seat and backrest onto the gas lift cylinder, ensuring the tapered end of the gas lift fits securely into the mechanism plate.

Diagram showing chair features including adjustable lumbar support, height adjustable padded arms, back tilt, tilt tension, height adjustment, and heavy duty chrome base with dual wheel casters.

Image 2: Key adjustable features of the office chair.

Operating Instructions

Your Flash Furniture Hercules Series office chair offers several adjustment options for personalized comfort.

1. Seat Height Adjustment

To Raise: While seated, lift the pneumatic seat height adjustment lever located under the right side of the seat. Shift your weight slightly off the seat, and the chair will rise. Release the lever at the desired height.
To Lower: While seated, lift the pneumatic seat height adjustment lever. Remain seated, and the chair will lower. Release the lever at the desired height.

2. Tilt and Tilt Lock

To Recline/Rock: Pull the tilt lock lever (typically located under the left side of the seat) outwards. The chair back will now allow you to recline or rock.
To Lock Upright: Push the tilt lock lever inwards. The chair will lock in an upright position.

3. Tilt Tension Adjustment

The round knob located under the front-center of the seat controls the tilt tension.
To Increase Tension (harder to recline): Turn the knob clockwise.
To Decrease Tension (easier to recline): Turn the knob counter-clockwise.

4. Lumbar Support Adjustment

The integrated lumbar support can be adjusted. Locate the adjustment mechanism on the back of the chair (often a dial or lever).
Adjust the lumbar support to provide optimal comfort and posture for your lower back.

Close-up view of the adjustable lumbar support mechanism on the back of the chair.

Image 3: Detail of the adjustable lumbar support.

5. Armrest Height Adjustment

Press the button or lever located on the side of each armrest.
While holding the button/lever, move the armrest up or down to your desired height. Release the button/lever to lock it in place.

Maintenance

Regular maintenance helps preserve the appearance and functionality of your office chair.

Cleaning: Wipe down the mesh back and padded seat with a damp cloth as needed. For more stubborn stains, use a mild soap solution and a soft cloth, then wipe dry. Avoid harsh chemicals or abrasive cleaners.
Casters: Periodically check casters for hair or debris that may hinder smooth movement. Clean as necessary.
Hardware: Every few months, check all screws and bolts to ensure they are tight. Re-tighten if loose to maintain stability.
Gas Lift: Do not attempt to disassemble or repair the gas lift cylinder yourself. If it malfunctions, contact customer support.

Troubleshooting

If you encounter issues with your chair, refer to the following common problems and solutions:

Problem	Possible Cause	Solution
Chair does not raise or lower	Gas lift cylinder malfunction or lever not engaged.	Ensure the height adjustment lever is fully engaged. If the problem persists, the gas lift may need replacement. Contact customer support.
Chair sinks slowly	Gas lift cylinder is failing.	The gas lift cylinder needs to be replaced. Contact customer support for a replacement.
Chair is wobbly or unstable	Loose screws or improper assembly.	Check and tighten all assembly screws, especially those connecting the seat, backrest, and armrests. Ensure the gas lift is fully seated in the base.
Casters do not roll smoothly	Debris (hair, lint) caught in casters.	Turn the chair over and carefully remove any debris from the caster wheels.
Chair does not tilt or is too stiff/loose	Tilt lock engaged or tilt tension incorrectly adjusted.	Ensure the tilt lock lever is disengaged (pulled out). Adjust the tilt tension knob (under the seat) to your preference.

Specifications

Key specifications for the Flash Furniture Hercules Series GO-99-3-GG Office Chair:

Model: GO-99-3-GG
Brand: Flash Furniture
Color: Black
Product Dimensions (Overall): 32"W x 29"D x 38.5-45.5"H
Backrest Width: 23 Inches
Arm Height: 9.25 Inches (from seat)
Maximum Weight Recommendation: 500 Pounds
Material: Mesh back, Padded fabric seat, Metal base
Special Features: Adjustable height, Adjustable tilt, Tilt lock, Adjustable tilt tension, Adjustable lumbar support, Height adjustable padded arms, Swivel base, Dual wheel casters
Assembly Required: Yes

Diagram showing the dimensions of the Flash Furniture Hercules Series GO-99-3-GG chair: 38.5-45.5 inches height, 29 inches depth, 32 inches width.

Image 4: Dimensional overview of the office chair.

Warranty and Support

For specific warranty details regarding your Flash Furniture Hercules Series GO-99-3-GG office chair, please refer to the warranty card included with your purchase or visit the official Flash Furniture website. Warranty terms typically cover manufacturing defects.

If you require assistance with assembly, parts, or troubleshooting beyond what is covered in this manual, please contact Flash Furniture customer support directly. Contact information can usually be found on the manufacturer's website or on your purchase documentation.

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Flash Furniture GO-99-3-GG