Introduction
This manual provides detailed instructions for the safe and efficient use of your Shark EVOPOWER SYSTEM CS401J cordless stick vacuum cleaner. Please read this manual thoroughly before operating the appliance and keep it for future reference.
The Shark EVOPOWER SYSTEM CS401J is a versatile cleaning solution designed for both stick and handheld use, offering powerful suction and smooth maneuverability for a comfortable cleaning experience throughout your home.
Safety Information
Always follow basic safety precautions when using electrical appliances to reduce the risk of fire, electric shock, or injury.
- Do not use outdoors or on wet surfaces.
- Do not allow to be used as a toy. Close attention is necessary when used by or near children.
- Use only as described in this manual. Use only manufacturer's recommended attachments.
- Do not handle plug or appliance with wet hands.
- Do not put any object into openings. Do not use with any opening blocked; keep free of dust, lint, hair, and anything that may reduce airflow.
- Keep hair, loose clothing, fingers, and all parts of body away from openings and moving parts.
- Turn off all controls before unplugging.
- Use extra care when cleaning on stairs.
- Do not use to pick up flammable or combustible liquids, such as gasoline, or use in areas where they may be present.
- Do not pick up anything that is burning or smoking, such as cigarettes, matches, or hot ashes.
- Do not use without dust cup and/or filters in place.
Product Components
Familiarize yourself with the components of your Shark EVOPOWER SYSTEM CS401J.

This image displays the charging dock, two removable batteries, and the mini motor head accessory. These are essential components for charging and specialized cleaning tasks.

This image illustrates the accessory dock, crevice tool, multi-tool, and upholstery tool. These accessories enhance the vacuum's versatility for various cleaning needs.
- Main Unit: The core of the vacuum cleaner, housing the motor and dust cup.
- Extension Wand: Connects the main unit to the floor nozzle for stick vacuum mode.
- Floor Nozzle: Equipped with the Brushless PowerFins for efficient cleaning on various floor types.
- Batteries (2): Rechargeable lithium-ion batteries for cordless operation.
- Charging Dock: For convenient charging and storage of the vacuum and accessories.
- Mini Motor Head: Specialized attachment for cleaning futons, mattresses, and fabrics.
- Crevice Tool: For cleaning tight spaces and corners.
- Multi-Tool: A versatile tool for various surfaces.
- Upholstery Tool: Designed for cleaning upholstered furniture.
Setup
Assembly
- Unpack Components: Carefully remove all parts from the packaging.
- Attach Floor Nozzle: Insert the extension wand into the floor nozzle until it clicks securely into place.
- Attach Main Unit: Insert the main unit into the top of the extension wand until it clicks securely.
- Install Battery: Insert a charged battery into the battery slot on the main unit until it clicks.
Charging the Battery
Before first use, fully charge the battery. The charging dock allows for easy charging and storage.
- Place the assembled vacuum cleaner onto the charging dock. Ensure the charging contacts align.
- Alternatively, remove the battery from the main unit and place it directly into the charging slot on the dock.
- The battery indicator lights will illuminate to show charging status. A full charge is indicated when all lights are solid.
- The second battery can be charged simultaneously in the dedicated slot on the charging dock.

This image shows the Shark EVOPOWER SYSTEM CS401J vacuum cleaner and its accessories stored on the charging dock, with a battery charging in its slot. This setup allows for convenient storage and automatic charging.
Operating Instructions
Using as a Stick Vacuum
For general floor cleaning, use the vacuum in stick mode.
- Ensure the battery is charged and installed.
- Press the power button on the main unit to start cleaning.
- The Brushless PowerFins are designed to clean various floor types effectively.
- To activate boost mode for stronger suction, lightly press the boost button located behind the main power button.

This image shows a person operating the Shark EVOPOWER SYSTEM CS401J in stick vacuum mode on a wooden floor, demonstrating its smooth maneuverability.
Using as a Handheld Vacuum
For quick clean-ups or hard-to-reach areas, convert the vacuum to handheld mode.
- Press the release button on the main unit to detach it from the extension wand.
- Attach desired accessories (crevice tool, multi-tool, upholstery tool, or mini motor head) directly to the handheld unit.
- Press the power button to begin cleaning.

This image shows a person using the Shark EVOPOWER SYSTEM CS401J in handheld mode to clean debris from a kitchen countertop, highlighting its ease of use for small spills.
Specialized Cleaning with Accessories
- Mini Motor Head: Ideal for deep cleaning futons, mattresses, and other fabric surfaces. Its high-speed rotation effectively removes dirt and pet hair.
- Crevice Tool: Perfect for narrow gaps, corners, and edges.
- Multi-Tool: Use for dusting shelves, blinds, and other delicate surfaces.
- Upholstery Tool: Designed for cleaning pet hair and debris from sofas and chairs.

This image demonstrates the mini motor head being used to clean a futon, showcasing its effectiveness on fabric surfaces.

This image illustrates the vacuum's ability to reach far under furniture, ensuring thorough cleaning in hard-to-reach areas.
Maintenance
Regular maintenance ensures optimal performance and extends the life of your vacuum cleaner.
Emptying the Dust Cup
- Ensure the vacuum is turned off.
- Press the dust cup release button to detach it from the main unit.
- Hold the dust cup over a trash bin and press the empty button to release debris.
- Reattach the dust cup until it clicks securely.
Cleaning Filters
The filters should be cleaned regularly to maintain suction power. The dust cup and filters are washable.
- Remove the dust cup.
- Remove the foam and felt filters from the dust cup.
- Rinse filters with cold water until the water runs clear.
- Allow filters to air-dry completely for at least 24 hours before reinstalling. Do not use a hairdryer or other heating methods.
- Reinstall dry filters into the dust cup, then reattach the dust cup to the main unit.

This image shows a person rinsing the dust cup and filter under running water, demonstrating the easy maintenance process to keep the vacuum clean.
Cleaning the Brushroll
The Brushless PowerFins are designed to prevent hair tangles, but occasional inspection is recommended.
- Turn off the vacuum and disconnect it from the charging dock.
- Inspect the brushroll for any debris, hair, or blockages.
- If necessary, use scissors to carefully cut away any tangled hair or string.
- Ensure the brushroll spins freely before resuming use.

This image illustrates the innovative Brushless PowerFins design, which effectively prevents hair from tangling around the brushroll, ensuring consistent cleaning performance.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Vacuum not turning on | Battery not charged or not properly installed. | Ensure battery is fully charged and clicks securely into place. |
| Loss of suction | Dust cup full, filters clogged, or blockage in nozzle/wand. | Empty dust cup. Clean filters. Check for and remove any blockages. |
| Brushroll not spinning | Obstruction in brushroll, or brushroll not properly engaged. | Turn off vacuum and remove any obstructions. Ensure the floor nozzle is correctly attached. |
| Battery not charging | Charging dock not powered, or battery not properly seated. | Ensure charging dock is plugged in. Re-seat the battery firmly in the dock. |
Specifications
- Model: CS401J
- Brand: Shark
- Color: Metallic Gray
- Power Source: Battery-powered
- Battery Type: Lithium-ion
- Other Features: Compact, Lightweight
- Filter Type: Cartridge
- Recommended Use Location: Futon, various floor types
- Package Size: 56.4 x 30.4 x 19.2 cm
- Package Weight: 5.21 kg
- ASIN: B08DYBPSPM
- First Available Date on Amazon.co.jp: 2020/08/06
Warranty and Support
Manufacturer's Warranty
The manufacturer's warranty applies only to products purchased from "SharkNinja" or our authorized retailers. Product registration is required to receive warranty service. Please register your product after arrival. The warranty period varies by product; please check the instruction manual for details.
Customer Support
For further assistance, troubleshooting, or to inquire about replacement parts, please contact Shark customer support. Refer to the official Shark website or your purchase documentation for contact information.