GJEMAX 42700038572
GJEMAX 18V 520Nm Cordless Impact Wrench User Manual
Model: 42700038572
Introduction
The GJEMAX 18V 520Nm Cordless Impact Wrench is a powerful and versatile tool designed for efficient and robust work. Whether for daily tasks like changing tires or for demanding applications in construction and industrial projects, this impact wrench provides exceptional performance. It features a brushless motor and a 2-in-1 chuck that includes both an internal hexagon for bit holders and a half-inch square drive. The included 18V 6.0Ah Lithium battery ensures long-lasting and reliable power without the need for cables.
What's in the Box

The GJEMAX Cordless Impact Wrench package typically includes the following components:
- GJEMAX 18V 520Nm Cordless Impact Wrench
- 1x 6.0Ah Lithium Battery
- 1x Fast Charger
- Storage Case
- Assorted Drill Bits and Screwdriver Bits (as shown in image)
- Various Sockets (as shown in image)
Image Description: A comprehensive view of the GJEMAX impact wrench kit, showcasing the main tool, a blue carrying case, an 18V 6.0Ah battery, a fast charger, and a variety of drill bits, screwdriver bits, and sockets, indicating an 18-piece complete package.
Setup
1. Charging the Battery
Before first use, fully charge the 6.0Ah Lithium battery. Connect the fast charger to a power outlet and then connect the battery to the charger. The charger will indicate when the battery is fully charged (refer to charger's LED indicators for status).
2. Installing the Battery
Align the battery with the battery slot at the base of the impact wrench handle. Slide the battery firmly into place until it clicks, ensuring it is securely seated.
3. Attaching Accessories
The GJEMAX impact wrench features a 2-in-1 chuck. For 1/2 inch square drive sockets, simply push the socket onto the square drive until it locks. For screwdriver bits or drill bits, use the internal hexagon chuck. Insert the bit into the hexagonal opening until it is firmly seated.

Image Description: A close-up view of the GJEMAX 18V 520Nm Cordless Impact Wrench, highlighting its robust design and the 1/2 inch square drive, emphasizing its power capabilities.
Operating Instructions
1. Powering On/Off
To power on the tool, press the trigger switch. Release the trigger to power off. The tool is equipped with an intelligent control panel for mode selection.
2. Adjusting Speed and Torque

The intelligent control panel allows you to switch between different power modes to suit your task. Use the mode selection button (often indicated by a power symbol or mode icon) to cycle through settings such as "HIGH" and "LOW" torque/speed modes. The LED indicators on the panel will show the currently selected mode and battery level.
Image Description: A detailed view of the GJEMAX impact wrench's intelligent control panel, showing LED indicators for battery level and selectable modes labeled "HOCH" (High) and "NIEDRIG" (Low), along with a power/mode switch button.
3. Forward/Reverse Rotation
A switch located near the trigger allows you to select the direction of rotation (forward for tightening, reverse for loosening). Ensure the switch is fully engaged in the desired position before operating the tool.
4. Safety Precautions During Operation
- Always wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Ensure the workpiece is stable and secured before applying torque.
- Do not force the tool; let the impact mechanism do the work.
- Keep hands and loose clothing away from rotating parts.
- Avoid operating the tool in wet conditions or near flammable liquids/gases.
Maintenance
1. Cleaning
Regularly clean the tool's ventilation openings to prevent overheating. Use a soft, damp cloth to wipe down the exterior. Do not use harsh chemicals or abrasive cleaners.
2. Battery Care
- Store batteries in a cool, dry place away from direct sunlight and extreme temperatures.
- Do not store fully discharged batteries for extended periods. Charge them periodically if not in use.
- Avoid dropping or physically damaging the battery pack.
3. Storage
When not in use, store the impact wrench, battery, and charger in the provided carrying case in a secure, dry location, out of reach of children.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not turn on. | Battery not charged or not properly installed. | Ensure battery is fully charged and securely inserted. |
| Low power or insufficient torque. | Battery charge is low; incorrect mode selected. | Recharge battery; switch to "HIGH" torque mode if available. |
| Accessory (bit/socket) does not hold. | Accessory not fully inserted; chuck mechanism worn. | Ensure accessory is pushed in completely. If issue persists, contact customer support for inspection. |
| Tool overheats. | Continuous heavy use; blocked ventilation. | Allow tool to cool down; clear any debris from ventilation openings. |
Specifications
| Feature | Detail |
|---|---|
| Brand | GJEMAX |
| Model Number | 42700038572 |
| Voltage | 18 Volt |
| Max. Torque | 520 Newton-meters |
| Chuck Size | 1/2 Inch (12.7 Millimeters) |
| Chuck Profile | Hexagon (for bits) and Square Drive (for sockets) |
| Battery Capacity | 6.0 Ampere-hours |
| Power Source | Battery Powered |
| Motor Type | Brushless Motor |
| Product Dimensions | 15 x 11 x 20 cm |
Warranty and Support
For information regarding warranty coverage, claims, or technical support, please refer to the documentation included with your product or visit the official GJEMAX website. Keep your purchase receipt as proof of purchase for any warranty-related inquiries.
For further assistance, please contact GJEMAX customer service.
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