JUEMEL KZH 1 Cordless Drill User Manual
Model: M8841
1. Introduction
Thank you for choosing the JUEMEL KZH 1 Cordless Drill. This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your new tool. Please read this manual thoroughly before first use and keep it for future reference.

Figure 1: JUEMEL KZH 1 Cordless Drill with included accessories, including the drill, battery, charger, and various bits.
2. Safety Instructions
Always follow basic safety precautions when using electric tools to reduce the risk of fire, electric shock, and personal injury.
General Safety Rules:
- Work Area Safety: Keep your 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.
- Electrical Safety: Avoid body contact with earthed or grounded surfaces (e.g., pipes, radiators, ranges, refrigerators). Do not expose power tools to rain or wet conditions.
- Personal Safety: Always wear eye protection. Use safety equipment such as dust masks, non-skid safety shoes, hard hats, or hearing protection when appropriate. Dress properly; avoid loose clothing or jewelry.
- Tool Use and Care: Do not force the power tool. Use the correct power tool for your application. Disconnect the plug from the power source and/or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools.
- Battery Pack Safety: Only recharge with the charger specified by the manufacturer. Do not use battery packs with any other power tools.
3. Package Contents
Upon unpacking, please verify that all items listed below are present and undamaged. If any items are missing or damaged, please contact customer support.

Figure 2: Detailed view of the JUEMEL KZH 1 Cordless Drill kit contents.
- JUEMEL KZH 1 Cordless Drill
- 2 x 1500mAh Li-ion Batteries
- Fast Charger
- Carrying Bag (Size: 300 x 200 x 160mm)
- Small Bag (Size: 190 x 105mm)
- Flexible Shaft Driver (190mm)
- 7 x Socket Wrenches (4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm)
- 1 x Carbide Drill Bit (Ø 6mm) for Stone
- 6 x Twist Drill Bits (Ø 2/3/4/5/6/8mm) for Metal
- 4 x Brad Point Drill Bits (Ø 4/5/6/16mm) for Wood
- 10 x Screwdriver Drill Bits (Ø 10mm/190mm*50mm)
4. Product Features & Components
Familiarize yourself with the key features and components of your JUEMEL KZH 1 Cordless Drill for optimal performance.

Figure 3: Key features of the JUEMEL KZH 1 Cordless Drill.
- Keyless Chuck: Allows for quick and easy bit changes without a chuck key. Maximum chuck size is 10mm (3/8").
- 2-Speed Settings: High speed (0-1450 RPM) for drilling and low speed (0-450 RPM) for driving screws.
- Variable Speed Trigger: Provides precise speed control based on pressure applied.
- Soft Grip Handle: Ergonomically designed for comfortable and secure handling, reducing fatigue.
- Built-in LED Light: Automatically illuminates the work area for improved visibility in dark spaces.
- Magnetic Bit Holder: Conveniently located on the back of the drill to hold drill bits and small accessories.
- Forward/Reverse Switch: Easily change the rotation direction for drilling or driving/removing screws.
- 18+1 Torque Adjustment: Allows for precise power control to suit various materials and tasks, preventing over-driving screws or damaging surfaces.
5. Setup
5.1 Battery Charging
The JUEMEL KZH 1 comes with two 1500mAh Li-ion batteries. Ensure batteries are fully charged before first use.

Figure 4: Battery charging process and indicator lights.
- Connect the fast charger to a standard electrical outlet.
- Slide the battery pack onto the charger. Ensure it clicks into place.
- The red light on the charger indicates that the battery is charging.
- The green light indicates that the battery is fully charged. The charger lights will turn from red to green when charging is complete.
- A full charge typically takes approximately 1 hour.
5.2 Battery Installation and Removal
- Installation: Align the battery pack with the base of the drill handle and slide it in until it clicks securely into place.
- Removal: Press the battery release button (usually located on the sides of the battery pack) and slide the battery pack out of the drill handle.
5.3 Installing and Removing Drill Bits/Accessories
- Ensure the drill is off and the forward/reverse switch is in the center (locked) position to prevent accidental starting.
- Rotate the keyless chuck counter-clockwise until the jaws are open wide enough to insert the desired bit.
- Insert the bit fully into the chuck.
- Rotate the chuck clockwise to tighten the jaws securely around the bit. Hand-tighten firmly.
- To remove, rotate the chuck counter-clockwise until the jaws open, then pull the bit out.
6. Operating Instructions
Understand how to effectively use your JUEMEL KZH 1 Cordless Drill for various applications.

Figure 5: Drilling into wood with the JUEMEL KZH 1.
6.1 Selecting Speed
- Use the 2-speed selector switch located on top of the drill:
- Position 1 (Low Speed): 0-450 RPM. Ideal for driving screws, larger drilling diameters, or applications requiring higher torque.
- Position 2 (High Speed): 0-1450 RPM. Suitable for smaller drilling diameters and applications requiring faster rotation.
6.2 Adjusting Torque
The torque adjustment collar allows you to set the amount of rotational force before the clutch disengages, preventing over-driving screws or damaging the workpiece.
- Rotate the torque adjustment collar to select one of the 18 torque settings or the drill mode.
- Lower settings (1-5) are for small screws or soft materials.
- Medium settings (6-12) are for medium screws or materials.
- Higher settings (13-18) are for larger screws or harder materials.
- The drill symbol setting is for drilling applications, providing maximum torque without clutch disengagement.
6.3 Forward/Reverse Operation
- Push the forward/reverse switch to the left for forward rotation (drilling/driving screws).
- Push the forward/reverse switch to the right for reverse rotation (removing screws/backing out bits).
- Center the switch to lock the trigger and prevent accidental starting.
6.4 Drilling and Driving

Figure 6: Various applications of the JUEMEL KZH 1 Cordless Drill.
- Starting: Place the tip of the bit or screw on the workpiece. Slowly press the variable speed trigger to start the drill.
- Controlling Speed: Increase pressure on the trigger to increase speed. Release pressure to decrease speed.
- Applying Pressure: Apply steady, even pressure in line with the drill bit. Avoid excessive force, which can cause the drill to stall or the bit to break.
- Using the LED Light: The built-in LED light will activate automatically when the trigger is pressed, illuminating your work area.
7. Maintenance
Regular maintenance ensures the longevity and optimal performance of your JUEMEL KZH 1 Cordless Drill.
- Cleaning: After each use, wipe down the drill with a clean, damp cloth. Do not use harsh chemicals or abrasive cleaners. Keep ventilation openings clear of dust and debris.
- Storage: Store the drill, batteries, and charger in a cool, dry place, away from direct sunlight and moisture. Ensure batteries are partially charged before long-term storage.
- Battery Care: Do not store batteries in a discharged state. Recharge them periodically if not in use for extended periods. Avoid exposing batteries to extreme temperatures.
- Chuck Maintenance: Periodically clean the chuck jaws to ensure proper gripping of bits.
8. Troubleshooting
This section addresses common issues you might encounter with your JUEMEL KZH 1 Cordless Drill.
| Problem | Possible Cause | Solution |
|---|---|---|
| Drill does not start. | Battery is not charged or not properly installed. Forward/reverse switch is in the center (locked) position. | Charge the battery. Ensure battery is securely installed. Move the forward/reverse switch to the left or right. |
| Loss of power during operation. | Battery is low on charge. Overload protection activated. | Recharge the battery. Reduce pressure on the drill or use a sharper bit. Allow the tool to cool down. |
| Bit slips in chuck. | Chuck not tightened sufficiently. Bit shank is dirty or damaged. | Re-tighten the chuck firmly. Clean the bit shank. Replace damaged bits. |
| Drill overheats. | Continuous heavy use. Blocked ventilation slots. | Allow the drill to cool down. Clear any obstructions from the ventilation slots. |
9. Specifications
Detailed technical specifications for the JUEMEL KZH 1 Cordless Drill.
| Specification | Value |
|---|---|
| Brand | JUEMEL |
| Model Number | M8841 |
| Power Source | Battery Powered |
| Voltage | 20 Volts |
| Battery Type | Lithium Ion (1500mAh) |
| Maximum Rotational Speed | 1450 RPM |
| Number of Speeds | 2 (0-450 RPM / 0-1450 RPM) |
| Maximum Torque | 320 Inch Pounds |
| Torque Settings | 18+1 |
| Maximum Chuck Size | 10 Millimeters (3/8") |
| Item Weight | 2.5 Pounds (with battery) |
| Product Dimensions | 7.1"L x 8"W x 2.9"H |
| Material | Plastic |
| Special Features | Variable Speed, Built-in LED, Magnetic Bit Holder |
10. Warranty and Support
JUEMEL is committed to providing high-quality products and excellent customer service.
Warranty Information:
This product comes with a 2-year warranty from the date of purchase. The warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, abuse, unauthorized modification, or normal wear and tear.
Customer Support:
For any questions, concerns, or warranty claims, please contact JUEMEL customer service. We offer 24/7 hassle-free online service to assist you.
Please visit the official JUEMEL store on Amazon for more information or to contact support: JUEMEL Store

