Introduction
This manual provides instructions and specifications for the Bafang RM G060.500 Fat Hub Motor Stator Assembly, designed as a replacement spare part for rear-drive freewheel e-bike motors. This assembly includes the motor stator, rotor, nylon gear set, clutch, and freewheel cover. It is available in 48V500W and 48V750W versions.
Please note that there are two engine versions with potentially different PCB shapes; the specific PCB shape may vary. It is crucial to ensure compatibility with your existing e-bike system before installation.
Specifications
48V500W Assembly Unit
The 48V500W assembly unit is designed for 175mm dropout e-bikes. Key specifications are detailed below:
Figure 1: Exploded view of the 48V500W Bafang Hub Motor Stator Assembly.
| Feature | Specification |
|---|---|
| Wattage | 500W |
| Voltage | 48V |
| Dropout | 175mm with spacer |
| Rotor Diameter | 124mm |
| Stator Width | 36mm |
| Nylon Gear Teeth | 36T |
| Nylon Gear Height | 13.6mm |
| Nylon Gear Diameter | 47.8mm |
| Clutch Diameter | 88mm |
| Clutch Height | 10mm |
| Connector | 9 pin waterproof |
| Shaft Diameter | 15mm, Flat 10mm |
| Shaft Length | 232mm |
Figure 2: Motor core with internal wiring and connector.
Figure 3: Motor core with visible nylon gears.
Figure 4: Motor core with gears and partial freewheel cover.
Figure 5: Assembled motor core with freewheel cover and wiring.
48V750W Assembly Unit
The 48V750W assembly unit is also designed for 175mm dropout e-bikes. While specific internal dimensions are not provided, it shares the same general design as the 500W version but features different connectors, making the 500W and 750W versions incompatible with each other due to these connector differences.
Figure 6: Exploded view of the 48V750W Bafang Hub Motor Stator Assembly.
Figure 7: 48V750W motor core with visible nylon gears.
Figure 8: Assembled 48V750W motor core with freewheel cover and wiring.
Setup and Installation
This Bafang motor stator assembly is a complex spare part. Professional installation by a qualified e-bike technician is highly recommended to ensure correct assembly and electrical connections.
Compatibility Check
Before installation, verify the following critical compatibility points:
- Dropout Size: This assembly is designed for 175mm dropout e-bike frames. It is NOT compatible with 190mm dropout motors. Ensure your e-bike frame has a 175mm dropout.
- Voltage and Wattage: Confirm that the replacement motor assembly (48V500W or 48V750W) matches the original motor's voltage and wattage specifications.
- Connector Type: The 48V500W and 48V750W versions have different connectors and are not interchangeable. Ensure the connector on the new assembly matches your e-bike's wiring harness. The connector is a 9-pin waterproof type.
Assembly Steps (General Guidance)
While specific step-by-step instructions are beyond the scope of this general manual, the installation typically involves:
- Carefully disassembling the existing hub motor to remove the damaged stator assembly.
- Transferring any necessary components (e.g., bearings, seals, if not included) from the old assembly or installing new ones onto the new stator assembly.
- Installing the new stator, rotor, nylon gear set, clutch, and freewheel cover into the hub motor casing.
- Ensuring all components are correctly seated and aligned.
- Connecting the 9-pin waterproof connector securely.
- Reassembling the hub motor and mounting it back onto the e-bike frame.
- Performing a functional test to ensure proper operation.
Operating Principles
As a core component of an e-bike hub motor, this stator assembly functions within the broader e-bike system. Once correctly installed, the motor will operate according to the e-bike's controller and battery specifications. Ensure that the e-bike's controller is compatible with the wattage and voltage of the installed motor assembly.
Maintenance
Proper maintenance of your e-bike's hub motor, including this stator assembly, will extend its lifespan and ensure optimal performance:
- Regular Cleaning: Keep the exterior of the hub motor clean from dirt, dust, and debris.
- Connection Checks: Periodically inspect the motor's electrical connections, especially the 9-pin waterproof connector, to ensure they are secure and free from corrosion.
- Gear Inspection: If accessible, periodically check the nylon gears for signs of wear or damage. Replace worn gears as necessary.
- Avoid Overloading: Do not exceed the recommended load capacity or power output of your e-bike system, as this can stress the motor components.
- Professional Servicing: Consider professional servicing annually or bi-annually, especially if you notice any unusual noises, vibrations, or a decrease in motor performance.
Troubleshooting
Most issues related to a replacement motor assembly stem from compatibility or installation errors.
- Motor Not Functioning After Installation:
- Verify all electrical connections are secure and correctly plugged in.
- Double-check that the motor assembly's voltage and wattage match your e-bike's controller and battery.
- Ensure the 9-pin waterproof connector is fully engaged and undamaged.
- Motor Makes Unusual Noises:
- This could indicate improper seating of internal components (stator, rotor, gears, clutch) or damage during installation. Professional inspection is recommended.
- Check for any foreign objects inside the motor casing.
- Compatibility Issues:
- If the motor does not fit your frame, re-verify your e-bike's dropout measurement. This assembly is strictly for 175mm dropouts, not 190mm.
- If electrical connections do not match, confirm you have the correct 500W or 750W version, as their connectors differ.
User Tips
- Speed Sensor: The presence and functionality of a speed sensor are typically integrated into the motor's design. If your e-bike system requires a speed sensor, confirm with the seller or consult your e-bike's original motor specifications to ensure this replacement assembly meets that requirement.
- Bike Model Compatibility: When replacing a motor part for specific bike models (e.g., Fiido T1 Pro cargo bike), always verify the dropout width (must be 175mm for this part) and the motor's voltage, wattage, and connector type to ensure a perfect fit and electrical compatibility.
Warranty and Support
This product comes with a 1-year warranty from the date of purchase. For warranty claims or technical support, please contact your seller with your purchase details.
Important Disclaimer
⚠️ Please mind potential fire risk and strictly follow the instruction manual for charging and storage of your e-bike's battery and overall system. This motor assembly itself does not involve charging or storage, but it is a critical component of an electrical system.
