Introduction
The Osaki OS-4000T massage chair incorporates advanced air massage technology, designed to provide a comprehensive and relaxing experience. This model features a streamlined airbag system that enhances massage volume and surface area, contributing to the chair's mechanical reliability. Key functionalities include Zero Gravity positioning, a unique foot roller system, and a user-friendly remote control for personalized massage sessions.
This manual provides essential information for the safe and effective use, setup, operation, and maintenance of your Osaki OS-4000T massage chair.
Safety Information
- Do not use the massage chair for more than 1-2 hours per day to prevent overstimulation or potential strain.
- Always plug the chair into a surge protector to safeguard against electrical fluctuations.
- To prevent damage to the product, avoid stepping on the calves part when sitting down or exiting the chair.
- After each use, ensure the calves part is adjusted back to its original position.
- Do not place arms between the shoulder and arm massage mechanisms to prevent injury when the backrest rises or reclines.
- Keep children and pets away from the chair's moving parts.
- Consult a physician before use if you have any medical conditions, are pregnant, or have a pacemaker.
Setup
The Osaki OS-4000T massage chair requires some assembly. Due to its size and weight (213 pounds), it is recommended to have at least two people for assembly and placement. The product is delivered via curbside delivery.
Unpacking and Placement
- Carefully remove all packaging materials. Retain packaging for future transport or returns.
- Place the chair in its desired location, ensuring sufficient space around it for reclining and leg extension.
- Connect the power cord to the chair and then to a surge protector, which should then be plugged into a grounded electrical outlet.
Initial Assembly Steps
While specific assembly instructions are typically provided in a separate guide with the product, general steps may include attaching the leg rest, armrests, and headrest/back cushions. Ensure all connections are secure before operating the chair.
Operating Instructions
Remote Control Overview
The Osaki OS-4000T features a full-size, easy-to-use remote control. It allows you to select massage types, adjust intensity, speed, and pinpoint massage locations. A compact wireless remote is also located on the back of the main remote for convenient control while reclined.

Image: The remote control for the Osaki OS-4000T massage chair, displaying buttons for different massage programs (Muscle Relief, Thai, Stretching, Anti-stress, Full Air, DEMO), body areas (Neck & Shoulder, Back & Lumbar), and controls for Zero-G, Timer, Pause, Back Speed, and Air Intensity. The remote also features a flip-down cover for additional manual functions.
Key Features and Functions
- Zero-Gravity Massager: This position supports the complete weight of your back, maximizing massage intensity and promoting a feeling of weightlessness and deep relaxation.
- Body Scanning: Equipped with advanced technology, the chair's rollers map your back curvature for a precise and customized massage experience.
- Unique Foot Roller: Two rows of spinning reflexology massagers provide a kneading-style application, stimulating acupuncture points and enhancing the massage with inflating airbags.
- Lumbar Heating Pads: Two heating pads in the lower back region provide soothing warmth to enhance the massage experience.
- Calf and Foot Massage: Airbags and rollers adjust according to leg length to ensure targeted massage on the correct areas of the calves and feet.
- Arm Air Massagers: Airbags compress the tops and bottoms of the forearm and hands, with durable spandex lining and small rubber bumps to invigorate the senses.
- Auto Recline and Leg Extension: The chair automatically adjusts the foot extension, leg rest, backrest recline, and zero-gravity position for effortless movement.
- Seat Vibration: A vibration plate in the seat base provides a gentle vibration massage to the back of the thighs.
- Shoulder, Lumbar & Hip Squeeze: Airbags inflate at independent times to gently twist the body, creating a deep stretch in the shoulders, lower back, hips, and thighs.

Image: Visual representation of the chair's core technologies including Zero Gravity, S-track roller system, hand-like massage rollers, computer body scanning, and the unique foot roller mechanism.

Image: A detailed diagram highlighting the placement of airbags for shoulder, side seat, arm & hand, low back, neck, hip, calves, and feet, along with their respective quantities, totaling 38 airbags.

Image: A close-up view of the arm air massagers, showing the design for forearm and hand compression.

Image: A side profile of the massage chair, indicating the auto recline and leg extension capabilities, the uniquely designed S-track, and the location of the wireless controller.

Image: Visuals demonstrating the calf and foot massage mechanism, the placement of lower back heating pads, and the body-twisting action of the shoulder, lumbar, and hip squeeze airbags.
Maintenance
Cleaning
The faux leather material of the Osaki OS-4000T massage chair can be easily cleaned by wiping it down with a damp cloth. Avoid using harsh chemicals or abrasive cleaners, as these may damage the material. Ensure the chair is unplugged before cleaning.
Storage
When not in use for extended periods, store the chair in a cool, dry place away from direct sunlight and extreme temperatures. Ensure the leg rest is in its original, retracted position to prevent damage.
Troubleshooting
If you encounter any issues with your Osaki OS-4000T massage chair, please refer to the following general troubleshooting steps:
- Chair not powering on: Ensure the power cord is securely plugged into both the chair and a functional electrical outlet (preferably with a surge protector). Check if the power switch on the chair is in the 'ON' position.
- Massage rollers not moving: Verify that a massage program has been selected on the remote control. Ensure no obstructions are present in the backrest or leg rest areas.
- Airbags not inflating: Check if the air intensity setting is adjusted to a desired level on the remote. Ensure all connections are secure.
- Unusual noises: Discontinue use immediately and contact customer support if you hear any abnormal sounds.
For persistent issues or technical support, please contact Osaki customer service.
Specifications
| Feature | Detail |
|---|---|
| Model Name | OS-4000T |
| Brand | Osaki |
| Color | Black |
| Material | Faux Leather |
| Product Dimensions (L x W x H) | 52" x 31" x 34" |
| Item Weight | 213 Pounds |
| Maximum Weight Recommendation | 250 Pounds |
| Included Components | Remote |
| Required Assembly | Yes |
| Air Bag Quantity (Total) | 38 (Shoulder: 2, Side Seat: 6, Arm & Hand: 8, Low back: 2, Neck: 3, Hip: 3, Calves: 8, Feet: 6) |

Image: The Osaki OS-4000T massage chair in black, with its overall dimensions (height, width, depth) clearly indicated.
Warranty and Support
The Osaki OS-4000T massage chair comes with a 30-day money-back guarantee, excluding the cost of shipping. Please note that items with damages caused by the buyer are not eligible for return.
For detailed warranty information, technical assistance, or to inquire about repairs, please contact Osaki customer support directly. Contact information can typically be found on the manufacturer's official website or in the product packaging.





