1. Important Safety Information
Read all safety warnings, instructions, illustrations, and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious injury.
General Power Tool Safety Warnings
- Work Area Safety: Keep work area clean and well lit. Cluttered or dark areas invite accidents. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Power tools create sparks which may ignite the dust or fumes.
- Electrical Safety: Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.
- Personal Safety: Stay alert, watch what you are doing, and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.
- Tool Use and Care: Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.
- Battery Tool Use and Care: Recharge only with the charger specified by the manufacturer. A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
2. Product Overview
The KIMO 1/2-inch Cordless Impact Wrench is a versatile tool designed for various fastening and drilling applications. It features a powerful brushless motor, dual-speed control, and an intelligent braking system for enhanced safety and efficiency.

Figure 2.1: KIMO 1/2-inch Cordless Impact Wrench and included accessories.
Package Contents
- 1x KIMO Impact Wrench
- 1x 4.0Ah Li-ion Battery
- 1x Fast Charger
- 1x Hex Strong Lock Converter
- 4x Sockets (15mm, 17mm, 19mm, 21mm)
- 6x High-Speed Steel Drill Bits
- 3x Chromium Vanadium Steel Screwdriver Bits
Key Features
- Industrial-Grade Brushless Motor: Delivers up to 550 Nm (406 ft-lbs) of torque and 3000 RPM for powerful and efficient operation.
- Dual-Speed Control: Seamlessly switch between high speed (up to 3000 RPM) and low speed (up to 2200 RPM) for precision and power.
- Advanced Intelligent Brake: Prevents nuts from falling during reverse operation, enhancing safety.
- Forward/Reverse Switch & Safety Lock: Easy direction changes and prevents accidental starts.
- 3-in-1 Multi-Impact Wrench: Compatible with wrench, drill, and screwdriver functions using the included hex converter.
- Efficient 4.0Ah Battery: Provides extended runtime and features 5 intelligent protection chips.
- Built-in LED Light: Illuminates the workspace for improved visibility in dark areas.
- Ergonomic Design: Lightweight (3.8 lbs) with a comfortable non-slip grip to reduce fatigue.
- Superior Cooling System: Ensures stable performance and extends tool lifespan by preventing overheating.

Figure 2.2: Industrial-grade brushless copper core motor for enhanced efficiency and lifespan.

Figure 2.3: Ergonomic non-slip grip designed for comfort and reduced fatigue.

Figure 2.4: Premium cooling system for rapid heat dissipation and long-lasting operation.
3. Setup
3.1 Charging the Battery
- Connect the fast charger to a standard power outlet.
- Slide the 4.0Ah Li-ion battery onto the charger until it clicks into place.
- The charger's indicator light will show the charging status. A full charge typically takes 1 hour.
- Once fully charged, remove the battery from the charger.
Note: The battery features a smart power indicator to show the remaining charge level. Always ensure the battery is fully charged before extensive use.
3.2 Installing/Removing the Battery
- Installation: Align the battery with the base of the impact wrench and slide it in until it locks securely.
- Removal: Press the battery release button (usually located on the side of the battery) and slide the battery off the tool.
3.3 Attaching Accessories (Sockets, Drill Bits, Screwdriver Bits)
- Ensure the tool is off and the safety lock is engaged.
- For Sockets: Push the desired 1/2-inch square drive socket onto the anvil of the impact wrench until it clicks into place. To remove, pull the socket firmly off the anvil.
- For Drill Bits/Screwdriver Bits (using Hex Strong Lock Converter):
- Insert the hex strong lock converter into the 1/2-inch square drive anvil.
- Insert the desired hex shank drill bit or screwdriver bit into the converter. The powerful locking ball will secure it.
- To remove, pull the bit out of the converter.

Figure 3.1: Included 9-piece drill and screwdriver set.

Figure 3.2: Hex Strong-Lock Converter for versatile bit usage.
4. Operating Instructions
4.1 Powering On/Off and Safety Lock
- To power on, disengage the safety lock by pushing it to the side.
- To power off and prevent accidental starts, engage the safety lock by pushing it to the center position.

Figure 4.1: Forward/Reverse switch and safety lock mechanism.
4.2 Forward/Reverse Operation
- The switch above the trigger controls the direction of rotation.
- Push the switch to the left for forward rotation (tightening nuts).
- Push the switch to the right for reverse rotation (removing nuts).
- Ensure the tool is stopped before changing direction.
4.3 Variable Speed Control
- The trigger provides variable speed control. Apply gentle pressure for lower speeds and increased pressure for higher speeds.
- The tool also features two adjustable speed settings (High and Low) which can be selected via a button on the tool.
- High Mode: Up to 3000 RPM for demanding tasks.
- Low Mode: Up to 2200 RPM for precision work.

Figure 4.2: Speed selection and power display.
4.4 Advanced Intelligent Brake
When operating in reverse mode, the intelligent brake system will rapidly stop the rotation once the fastener is loose, preventing it from falling off. This feature enhances safety and efficiency, especially when working in tight spaces.

Figure 4.3: Intelligent Brake in action, securing fasteners during removal.
4.5 Using the LED Light
The built-in LED light automatically illuminates when the trigger is pressed, providing visibility in dimly lit work areas. This eliminates the need for additional lighting.

Figure 4.4: Built-in LED light for enhanced visibility.
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your KIMO Impact Wrench.
5.1 Cleaning
- Always disconnect the battery before cleaning.
- Use a soft, damp cloth to wipe down the tool. Do not use harsh chemicals or abrasive cleaners.
- Keep ventilation openings clear of dust and debris to ensure proper cooling.
5.2 Battery Care and Storage
- Store batteries in a cool, dry place away from direct sunlight and extreme temperatures.
- Do not store batteries in a discharged state for extended periods. Recharge them periodically if not in use.
- Avoid dropping or physically damaging the battery pack.
5.3 General Storage
- Store the impact wrench and its accessories in a clean, dry, and secure location, out of reach of children.
- Protect the tool from moisture and dust.
6. Troubleshooting
Refer to this section for common issues and their solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start. | Battery not charged or improperly installed. Safety lock engaged. | Ensure battery is fully charged and correctly installed. Disengage the safety lock. |
| Reduced power or intermittent operation. | Low battery charge. Overheating. Loose battery connection. | Recharge battery. Allow tool to cool down. Re-seat the battery firmly. |
| Accessory (socket/bit) falls out. | Improper installation of accessory or converter. Worn anvil/converter. | Ensure accessory is fully seated and locked. Inspect anvil/converter for wear; replace if necessary. |
| LED light not working. | Faulty LED. | Contact KIMO customer support for assistance. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | 3603 |
| Brand | KIMO |
| Voltage | 20 Volts |
| Max Torque | 550 N.m (406 ft-lbs) |
| No-Load Speed | Up to 3000 RPM (High Mode), Up to 2200 RPM (Low Mode) |
| Drive Size | 1/2 inch Square Drive |
| Battery Capacity | 4.0Ah Lithium Ion |
| Charging Time | Approx. 1 hour |
| Motor Type | Brushless |
| Item Weight | 6.23 pounds (with battery) |
| Material | Metal |
| UPC | 731029233222 |

Figure 7.1: Torque capabilities for different tasks including tightening screws, shelf installation, tire disassembly, and industrial applications.
8. Warranty and Support
KIMO products are manufactured to high-quality standards and are warranted against defects in materials and workmanship. For specific warranty details, please refer to the warranty card included with your product or visit the official KIMO website.
If you encounter any issues or have questions regarding your KIMO 1/2-inch Cordless Impact Wrench, please contact KIMO Customer Support:
- Website: Visit the KIMO Store on Amazon
- Email/Phone: Refer to your product packaging or the KIMO website for the most current contact information.


