Bafang RM G020.350.D Rear Hub Motor Instruction Manual

1. Product Overview

This manual provides essential information for the safe and efficient use of your Bafang 36V/48V500W RM G020.350.D Rear Hub Motor. This geared rear drive motor is designed for electric bicycles, offering robust power and compatibility with disc brake systems and cassettes. It features a rated power of 350W/500W, a reduction ratio of 1:5, and a maximum torque of 55 N.m, weighing 3.6 kg.

2. Specifications

The following table details the technical specifications of the Bafang RM G020.350.D Rear Hub Motor:

3. Setup and Installation

This section outlines the general steps for installing your Bafang rear hub motor. Professional installation is recommended if you are unfamiliar with e-bike conversions.

3.1 Unpacking and Inspection

Carefully unpack all components and inspect for any damage. Ensure all listed accessories are present:

• Bafang RM G020.350.D Rear Hub Motor
• 9-pin extension cable
• Necessary nuts and washers for mounting

3.2 Motor Installation Steps

1. Prepare the Bicycle: Remove the existing rear wheel from your bicycle. Ensure your frame's rear dropout spacing (open size) is compatible with the motor's 138mm dimension.
2. Mount the Motor: Insert the Bafang hub motor into the rear dropouts of your bicycle frame. Ensure the motor cable exits on the right side as specified.
3. Secure the Motor: Use the provided nuts and washers to securely fasten the motor to the frame. Tighten all nuts to the manufacturer's recommended torque specifications (refer to your bicycle's manual or a professional for specific torque values).
4. Install Cassette and Disc Brake: Mount your bicycle's cassette onto the motor's cassette body. Install your disc brake rotor onto the motor's disc brake mounting points.
5. Connect the Motor Cable: Connect the motor's 9-pin waterproof connector to the provided extension cable, and then connect the extension cable to your e-bike controller. Ensure a firm and secure connection.

Important: Always ensure all connections are secure and waterproof before operating the e-bike.

4. Operating Instructions

Once the motor is correctly installed and connected to a compatible e-bike controller and battery (36V or 48V), you can begin operating your electric bicycle.

1. Power On: Turn on your e-bike battery and controller system.
2. Select Assist Level: Use your e-bike display/controller to select the desired pedal assist level.
3. Pedal or Use Throttle: Begin pedaling, and the motor will provide assistance based on your selected level and pedal input (if using a pedal-assist system). If your system includes a throttle, you can use it to engage the motor directly.
4. Monitor Speed: The motor is capable of speeds between 45-55 km/h. Always adhere to local regulations regarding e-bike speed limits.
5. Braking: The motor is compatible with disc brakes. Ensure your braking system is fully functional and properly adjusted for safe operation.
6. Power Off: After your ride, turn off the e-bike system and battery.

5. Maintenance

Regular maintenance ensures the longevity and optimal performance of your Bafang hub motor.

• Keep Clean: Periodically clean the motor casing to prevent dirt and debris buildup.
• Check Connections: Regularly inspect all electrical connections, especially the 9-pin waterproof connector, for tightness and signs of wear or corrosion.
• Inspect Spokes: Ensure spokes are properly tensioned. Loose spokes can lead to wheel damage.
• Brake System: Regularly check your disc brake system for proper function, pad wear, and rotor condition.
• General Inspection: Perform a general visual inspection of the motor and surrounding components for any loose parts, cracks, or unusual noises.

Do not attempt to open the motor casing unless you are a qualified technician, as this may void your warranty and cause damage.

6. Troubleshooting

If you encounter issues with your Bafang hub motor, consider the following basic troubleshooting steps:

• Motor Not Engaging:
  • Check if the battery is charged and properly connected.
  • Ensure all motor cable connections are secure.
  • Verify that the e-bike system is powered on and an assist level is selected.
  • Inspect for any visible damage to the motor cable or connector.
• Unusual Noises:
  • Stop riding immediately.
  • Check for any loose components or foreign objects near the motor or wheel.
  • If noises persist, contact support.
• Reduced Performance:
  • Ensure the battery is fully charged.
  • Check for any drag from the brakes or other components.
  • Verify that the motor is not overheating (though this motor has a noise degree of <65dB, indicating efficient operation).

For complex issues, it is recommended to consult a professional e-bike technician.

7. User Tips

• Compatibility Check: Before purchasing or installing, always verify that the motor's specifications (e.g., 138mm open size, 36V/48V compatibility) match your bicycle frame and existing e-bike system (battery, controller). Questions from other users indicate the importance of checking compatibility with specific bike models like Engwei EP-2 Pro or Moma bicycles.
• Power System: Ensure your battery and controller are rated for 36V or 48V and can supply sufficient current for the 350W/500W motor.
• Professional Assistance: If you are unsure about any installation or maintenance steps, seek assistance from a certified e-bike mechanic to ensure safety and proper function.

8. Warranty and Support

This Bafang RM G020.350.D Rear Hub Motor comes with a 1-year warranty from the date of purchase. The warranty covers manufacturing defects and malfunctions under normal use conditions.

For warranty claims, technical support, or any questions regarding your motor, please contact the seller or authorized service center with your purchase details.

Please retain your proof of purchase for warranty purposes.