1. Introduction
Thank you for choosing the Miuzei Servo RC 45 kg 270 Degree Coreless Digital Servo. This high-performance, waterproof servo is designed for demanding applications in remote-controlled vehicles, robotics, and other mechanical projects. This manual provides essential information for the proper installation, operation, and maintenance of your servo to ensure optimal performance and longevity.
2. Safety Information
- Power Supply: Ensure the power supply voltage is within the specified range (4.8V-8.4V). Exceeding this range can damage the servo.
- Polarity: Always connect the servo wires with correct polarity (Black: Ground, Red: Positive, White: Signal). Incorrect connections can cause damage.
- Overload: Avoid continuously stalling or overloading the servo, as this can lead to overheating and permanent damage.
- Heat Dissipation: While the CNC casing aids in heat dissipation, ensure adequate airflow around the servo, especially during intensive use.
- Waterproof Rating: The servo is IP66 waterproof. While it can withstand splashes and temporary submersion, it is not designed for prolonged underwater operation. Ensure all connections are dry before applying power.
- Children: This product is not a toy. Keep out of reach of small children due to small parts and electrical components.
3. Product Overview
The Miuzei 45 kg 270 Degree Coreless Digital Servo is engineered for precision and durability. It features a robust design suitable for various demanding applications.
Key Features:
- High Quality Construction: Features high-precision metal gear transmission with hard anodizing for improved accuracy and extended lifespan. The CNC central casing enhances heat dissipation.
- High Power Performance: Equipped with a high-precision potentiometer and a high-resolution digital chip, ensuring stable performance, fast response, strong anti-interference capabilities, low noise, and rapid heat dissipation.
- Waterproof Design: IP66 rated for protection against dust and water ingress, making it suitable for various environmental conditions.
- Wide Application: Ideal for robots, mechanical arms, climbing vehicles, RC boats, RC aircraft, and other DIY models.
- Wide Voltage Range: Operates efficiently within a 4.8V to 8.4V power supply range.
Included Components:
- Miuzei 45 kg Digital Servo (2 units for this package)
- Various Servo Horns
- Mounting Screws

Internal view of the Miuzei 45kg servo showing the durable steel gears and coreless digital motor. This image illustrates the high-precision metal gear transmission system, designed for enhanced accuracy and extended lifespan. The CNC central casing aids in heat dissipation, ensuring reliable servo operation.

Miuzei 45kg servo submerged in water, illustrating its IP66 waterproof rating. The Miuzei 45kg servo is designed with IP66 waterproofing, making it suitable for use in environments where exposure to water or moisture is expected, such as RC boats or off-road vehicles.
4. Specifications

Miuzei 45kg servo with key performance specifications listed, including speed, torque, and rotation angle. Key performance data for the Miuzei 45kg servo. It features a no-load speed of 0.10 sec/60° at 8.4V and a stall torque of 51.5 kg/cm at 8.4V, with a 270° rotation angle (PWM 500-2500usec).
| Feature | Specification |
|---|---|
| Model Number | CNGM-K-MS69 |
| Operating Voltage | 4.8V - 8.4V |
| Stall Torque (4.8V) | 40 kg/cm |
| Stall Torque (6.0V) | 45 kg/cm |
| Stall Torque (8.4V) | 51.5 kg/cm |
| No-Load Speed (4.8V) | 0.13 sec/60° |
| No-Load Speed (6.0V) | 0.12 sec/60° |
| No-Load Speed (8.4V) | 0.10 sec/60° |
| Rotation Angle | 270° (PWM 500-2500usec) |
| Dead Band Width | 2 usec |
| Gear Type | Metal |
| Motor Type | Coreless Digital Motor |
| Dimensions (L x W x H) | 40 x 20 x 38 mm |
| Weight | 60 g |
| Cable Length | 50 cm |
| Waterproof Rating | IP66 |

Technical drawing of the Miuzei 45kg servo with detailed dimensions in millimeters and various servo horns. This diagram provides precise measurements of the servo body (40mm x 20mm x 38mm) and various included servo horns, essential for proper installation and fitment in your application.
5. Setup
Follow these steps to properly set up your Miuzei 45 kg digital servo:
- Mounting the Servo: Securely mount the servo in your model using the provided screws and appropriate mounting brackets. Ensure the servo is firmly attached to prevent movement during operation.
- Attaching the Servo Horn: Select the appropriate servo horn for your application. Attach it to the servo output shaft. It is recommended to attach the horn after the servo is centered (see step 3) to ensure correct alignment.
- Connecting to Receiver/Controller: Connect the servo's 3-wire cable to the corresponding channel on your RC receiver or microcontroller. Pay close attention to the wiring polarity:
- Black Wire: Ground (GND)
- Red Wire: Positive Power (VCC)
- White Wire: Signal (PWM)
- Power On and Centering: With your RC transmitter or control system turned on and set to neutral, power on your receiver/controller. The servo should move to its center position. If the servo horn was not attached, you can now attach it in the desired neutral position.
- Calibration (if necessary): Depending on your application, you may need to calibrate the servo's endpoints and travel limits using your RC transmitter or programming software to prevent over-rotation and potential damage.

Wiring diagram for the Miuzei servo, showing black for cathode, red for anode, and white for signal. This image displays the standard wiring color code for the servo: Black wire for Cathode (Ground), Red wire for Anode (Positive Power), and White wire for Signal. Ensure correct polarity during connection.
6. Operating Instructions
The Miuzei 45 kg digital servo operates based on Pulse Width Modulation (PWM) signals from your receiver or microcontroller. The pulse width determines the servo's angular position.
- Control Signal: The servo responds to PWM signals typically ranging from 500 to 2500 microseconds (µs) for its 270-degree rotation. A pulse width of approximately 1500 µs usually corresponds to the center position.
- Movement: Varying the pulse width will cause the servo to rotate to a specific angle. Shorter pulses (e.g., 500 µs) will move it to one extreme, while longer pulses (e.g., 2500 µs) will move it to the other extreme.
- Smooth Operation: For smooth and precise movements, ensure your control signals are stable and free from interference.
- Avoid Stalling: Do not force the servo past its mechanical limits or hold it in a stalled position for extended periods, as this can cause excessive current draw and heat, leading to damage.

Diagram illustrating the 270-degree control angle of the Miuzei MS69 servo. This visual representation shows the full range of motion, from 0 to 270 degrees, achievable by the servo when controlled by appropriate PWM signals.

Collage of various applications for the Miuzei 45kg servo, including robots, RC cars, aircraft models, and ship models. The Miuzei 45kg servo is versatile and can be applied in a wide range of projects, including robotic arms, remote-controlled cars, aircraft models, and ship models, demonstrating its adaptability and robust performance.
7. Maintenance
Proper maintenance will extend the life and performance of your servo:
- Cleaning: Regularly clean the exterior of the servo to remove dust, dirt, and debris. Use a soft, dry cloth. For stubborn dirt, a slightly damp cloth can be used, ensuring no moisture enters the internal components.
- Gear Inspection: Periodically inspect the metal gears for any signs of wear, damage, or foreign objects. While the gears are durable, extreme impacts can cause issues.
- Lubrication: The gears are pre-lubricated. Avoid applying excessive or incorrect lubricants, as this can attract dirt and hinder performance. If re-lubrication is necessary after extensive use or repair, use a specialized plastic-safe grease.
- Cable Inspection: Check the servo cable for any cuts, fraying, or damage. Damaged cables can lead to intermittent operation or short circuits.
- Storage: Store the servo in a dry, cool place away from direct sunlight and extreme temperatures.
8. Troubleshooting
If you encounter issues with your Miuzei servo, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Servo not responding | No power, incorrect wiring, faulty signal, damaged servo. | Check power supply and connections. Verify correct wiring polarity. Test with a different signal source or servo tester. Replace if damaged. |
| Servo jitters or moves erratically | Interference, weak power supply, loose connections, faulty potentiometer. | Ensure proper shielding and distance from noise sources. Use a stable power supply with sufficient current. Check all connections. If problem persists, servo may be faulty. |
| Servo lacks power or torque | Under-voltage, excessive load, worn gears. | Verify power supply voltage and current capacity. Reduce mechanical load. Inspect gears for wear. |
| Servo overheats | Continuous stalling, excessive load, insufficient cooling. | Avoid stalling. Reduce load on the servo. Ensure adequate ventilation around the servo. |
| Servo makes unusual noises | Gear damage, foreign object in gears, internal component issue. | Inspect gears for damage or debris. If noise persists and performance is affected, the servo may require replacement. |
9. Warranty and Support
Miuzei products are manufactured to high standards. For warranty information, technical support, or service inquiries, please contact the retailer where you purchased the product or visit the official Miuzei website for customer service contact details. Please have your product model number (CNGM-K-MS69) and purchase information ready when contacting support.