1. Introducció
This manual provides essential information for the safe and efficient use of your JGA25-370 Geared DC Motor. This high-torque electric gear motor is available in various RPMs and voltages (6V, 12V, 24V) and is suitable for a wide range of applications requiring controlled rotational speed and power.
Please read this manual thoroughly before installation and operation to ensure proper function and longevity of the motor.
2. Precaucions de seguretat
Failure to follow these safety instructions may result in injury or damage to the motor.
- Match the rated voltage i freqüència.
- Ensure wiring is firm, reliable, and properly grounded.
- Always perform power-off maintenance.
- Strictly prevent stalling and overload; the load must not exceed the rated torque.
- Avoid frequent starting and stopping.
- Install the motor smoothly and securely, ensuring the axis is aligned and concentric.
- Do not strike the shaft end or forcefully push it.
- Monitor temperature, noise, and vibration during operation. Immediately cut off power for troubleshooting if abnormal temperature, noise, or jamming occurs.
- Operate in clean and dry environments. Protect the motor from dust, corrosive substances, and condensation.
- Add lubricating grease according to specifications.
- Do not disassemble the motor unless you are a professional.
- Replace parts with components of the same specifications.
3. Especificacions
The JGA25-370 geared DC motor is available in various configurations. Key specifications are detailed below.
3.1 Especificacions generals
- Número de model: JGA25-370
- Tipus: Motor d'engranatges
- Construcció: Imant permanent
- Commutation: Raspall
- Protect Feature: Alentiment
- Eficiència: IE 1
- Continuous Current (A): 0.03A
- Potència de sortida: <18.65W
- Parell: 9KG.CM (This is a general value; specific torque depends on reduction ratio and voltage)
- Origen: Xina continental
- Certificació: CAP
- Funcionalitat sense fil: No
- Bateria inclosa: No
- Substància química molt preocupant: Cap
3.2 Dimensions
Refer to the diagram below for detailed dimensions of the JGA25-370 motor. Note that the overall length 'L' varies with the reduction ratio.

Descripció de la imatge: A technical drawing illustrating the dimensions of the JGA25-370 geared DC motor. It includes a side view with measurements for overall length (L), shaft diameter (Ø4mm), motor body diameter (Ø25mm), and gearbox diameter (Ø25mm). A front view shows the mounting holes (6-M3, P.C.DØ31) and shaft details. A table above the diagram correlates the 'L' value (length in mm) to different reduction ratios (4.4, 9.6, 21.3, 35.5, 46.8, 78, 103, 171, 226, 377, 500). The diagram notes that 'L' is determined by the reduction ratio, and a slower speed results in a longer 'L'. It also mentions a slight error in manual measurement and advises referring to the actual product.
- Diàmetre de l'eix: 4 mm
- Motor Body Diameter: 25 mm
- Gearbox Diameter: 25 mm
- Forats de muntatge: 6-M3, P.C.DØ31
3.3 Performance Tables
The following tables provide detailed performance characteristics for different voltage and reduction ratio configurations.
3.3.1 ZYTD-520 (12V-3500R) & (24V-5000R) Performance
| Formulari | Relació de reducció | 1/21 | 1/48 | 1/53 | 1/113 | 1/263 | 1/352 | 1/641 |
|---|---|---|---|---|---|---|---|---|
| ZYTD-520 (12V-3500R) | Velocitat sense càrrega (r/min) | 165 | 72 | 65 | 30 | 13 | 10 | 5 |
| Load speed (r/min) | 135 | 59 | 53 | 25 | 11 | 9 | 5 | |
| Load moment (kgf.cm) | 0.95 | 2 | 2.2 | 4 | 8 | 8 | 10 | |
| Power supply positive connection + terminal | CW | CCW | CW | CCW | CW | CW | CW | |
| ZYTD-520 (24V-5000R) | Velocitat sense càrrega (r/min) | 240 | 105 | 94 | 44 | 19 | 14 | 8 |
| Load speed (r/min) | 200 | 87 | 79 | 37 | 16 | 13 | 7 | |
| Load moment (kgf.cm) | 1 | 2.1 | 2.3 | 4.2 | 8 | 8 | 10 | |
| Power supply positive connection + terminal | CW | CCW | CW | CCW | CW | CW | CW |
3.3.2 Reduction Ratio, Length, and Rated Torque
| Relació de reducció | L (mm) | Sèrie | Rated torque (mN.m) | Rated torque (kgf.cm) |
|---|---|---|---|---|
| 1/21 | 22.5 | 3 | 245 | 2.5 |
| 1/48 - 1/53 | 24.5 | 4 | 392 | 4 |
| 1/113 | 26.5 | 5 | 588 | 6 |
| 1/263 - 1/352 | 29.5 | 6 | 784 | 8 |
| 1/641 | 30.5 | 7 | 980 | 10 |
3.3.3 No-Load and Load Characteristics (ZYTD-520)
| Voltage | Sense càrrega | Carrega | Direcció de rotació | ||||
|---|---|---|---|---|---|---|---|
| DC | corrent (mA) | speed (r/min) | moment (gf.cm) | corrent (mA) | speed (r/min) | Direcció de rotació | |
| ZYTD-520 12V | 60 | 3450 | 65 | 250 | 2800 | CCW | |
| ZYTD-520 24V | 40 | 5000 | 70 | 190 | 4150 | CCW | |
3.3.4 Detailed Model Performance (B37RG Series)
| Model | Voltage | Label speed | Sense velocitat de càrrega | Velocitat del motor (rpm) | Relació de reducció |
|---|---|---|---|---|---|
| B37RG981i | 12 V | 2.5R | 2.5R | 2500 | 981:1 |
| B37RG981i | 12 V | 5R | 5.5R | 5000 | 981:1 |
| B37RG516i | 12 V | 10R | 11R | 5500 | 516:1 |
| B37RG314i | 12 V | 15R | 16R | 5000 | 314:1 |
| B37RG221i | 12 V | 20R | 22R | 5000 | 221:1 |
| B37RG148i | 12 V | 30R | 33R | 5000 | 148:1 |
| B37RG111i | 12 V | 45R | 45R | 5000 | 111:1 |
| B37RG94.85i | 12 V | 50R | 52R | 5000 | 94.85:1 |
| B37RG57.7i | 12 V | 60R | 62R | 3500 | 57.7:1 |
| B37RG57.7i | 12 V | 87R | 87R | 5000 | 57.7:1 |
| B37RG47.5i | 12 V | 100R | 105R | 5000 | 47.5:1 |
| B37RG40.6i | 12 V | 120R | 123R | 5000 | 40.6:1 |
| B37RG31i | 12 V | 150R | 160R | 5000 | 31:1 |
| B37RG22i | 12 V | 200R | 227R | 5000 | 22:1 |
| B37RG17.4i | 12 V | 300R | 285R | 5000 | 17.4:1 |
| B37RG11.8i | 12 V | 400R | 422R | 5000 | 11.8:1 |
| B37RG8.7i | 12 V | 570R | 570R | 5000 | 8.7:1 |
| B37RG8.7i | 12 V | 630R | 630R | 5500 | 8.7:1 |
| B37RG3i | 12 V | 1000R | 1000R | 3000 | 3:1 |
| B37RG981i | 24 V | 2.5R | 2.5R | 2500 | 981:1 |
| B37RG981i | 24 V | 5R | 5R | 5000 | 981:1 |
| B37RG314i | 24 V | 10R | 11R | 3500 | 314:1 |
| B37RG314i | 24 V | 15R | 16R | 5000 | 314:1 |
| B37RG221i | 24 V | 20R | 22R | 5000 | 221:1 |
| B37RG148i | 24 V | 30R | 33R | 5000 | 148:1 |
| B37RG0111i | 24 V | 45R | 45R | 5000 | 111:1 |
| B37RG94.85i | 24 V | 50R | 52R | 5000 | 94.85:1 |
| B37RG94.85i | 24 V | 60R | 63R | 6000 | 94.85:1 |
| B37RG57.7i | 24 V | 87R | 87R | 5000 | 57.7:1 |
| B37RG47.5i | 24 V | 100R | 105R | 5000 | 47.5:1 |
| B37RG40.6i | 24 V | 120R | 123R | 5000 | 40.6:1 |
| B37RG31i | 24 V | 150R | 160R | 5000 | 31:1 |
| B37RG22i | 24 V | 200R | 227R | 5000 | 22:1 |
| B37RG17.4i | 24 V | 300R | 285R | 5000 | 17.4:1 |
| B37RG13.48i | 24 V | 370R | 370R | 5000 | 13.48:1 |
| B37RG8.7i | 24 V | 570R | 570R | 5000 | 8.7:1 |
| B37RG3i | 24 V | 1150R | 1165R | 3500 | 3:1 |
4. Configuració i instal·lació
Proper installation is crucial for the motor's performance and lifespan.
- Muntatge: Install the motor smoothly and securely. Ensure the motor's axis is perfectly aligned and concentric with the driven component. Avoid any forceful striking or pushing on the shaft end during installation.
- Cablejat: Connect the motor firmly and reliably to your power source. Ensure proper grounding to prevent electrical hazards. Match the rated voltage and frequency of the motor with your power supply.
- Medi ambient: The motor is designed for clean and dry environments. Take necessary precautions to protect it from dust, corrosive substances, and condensation.
For visual reference, here are images of the motor and its internal components:



5. Instruccions de funcionament
Once installed, the motor is ready for operation. Follow these guidelines:
- Encès: Apply the correct rated voltage (6V, 12V, or 24V) to the motor terminals.
- Direcció de rotació: The motor's rotation direction can be changed by reversing the polarity of the power supply. Connecting the positive terminal to one motor lead and negative to the other will result in one direction; reversing them will result in the opposite direction.
- Gestió de càrrega: Do not exceed the motor's rated torque to prevent stalling or overload. Avoid frequent starting and stopping, as this can reduce motor lifespan.
Watch this video for a demonstration of the motor's operation and how to reverse its direction:
Descripció del vídeo: A short video demonstrating the JGA25-370 geared DC motor. It shows the motor being held and connected to a power source using alligator clips, illustrating its rotation and how reversing the connections changes the direction of spin. A small paper flag is attached to the shaft to clearly show rotation.
6. Manteniment
Regular maintenance ensures optimal performance and extends the motor's life.
- Lubricació: Add lubricating grease according to the specifications.
- Neteja: Keep the motor clean and free from dust and debris.
- Inspecció: Periodically inspect the wiring for firm connections and ensure proper grounding. Check for any signs of wear or damage.
- Servei professional: Do not attempt to disassemble or repair the motor if you are not a qualified professional. Always replace parts with components of the same specifications.
7. Solució De Problemes
Si teniu problemes amb el motor, consulteu els següents problemes i solucions habituals:
- El motor no funciona:
- Comproveu el volum d'alimentaciótage and frequency match motor specifications.
- Ensure wiring connections are firm and reliable.
- Verificar la connexió a terra correcta.
- Check for stalling or overload; reduce load if necessary.
- Abnormal Noise, Vibration, or Overheating:
- Immediately cut off power.
- Inspect for mechanical jamming or misalignment of the shaft.
- Check for excessive load.
- Ensure the motor is operating in a clean and dry environment, free from dust or corrosion.
- Si els problemes persisteixen, es recomana una inspecció professional.
- Rendiment reduït:
- Check for signs of wear on internal components (gears, brushes).
- Ensure adequate lubrication.
- Verify the load is within the rated torque.
8. Consells d'usuari
Based on common user experiences and questions:
- Material de l'engranatge: The gears inside the gearbox are made of metal, ensuring durability and excellent quality.
- Voltage Compatibilitat: A 12V motor can often run on 14.4V without issues, resulting in slightly faster operation. For a 6V motor, a 7.4V battery might work, but consider a 12V motor for higher voltage aplicacions.
- RPM for Applications:
- For heavy-duty electric screwdrivers, 200 RPM or less is often recommended for better control and torque.
- For RC tanks with 120mm tires, 150 RPM at 12V is generally suitable, though 100 RPM might offer more torque if speed isn't the primary concern. For smaller 12mm tires, 6V might be sufficient.
- For applications requiring significant pulling force or smooth operation (e.g., WPL RC vehicles), lower RPMs (e.g., 200 RPM instead of 400 RPM) can provide better torque and control.
- Funcionament continu: The motor can run for extended periods. Some users report motors running warm after 5 minutes of operation, but the gearbox remains cool without load.
- Self-Locking: The motor is generally not self-locking, meaning the shaft can be turned manually when power is off, depending on the reduction ratio and external load.
- Consum d'energia: For a 12V motor, current consumption under load can be around 200-280 mA for a 30 RPM model. Power consumption for a 6V motor is approximately 12W (6V * 2A), and for a 12V motor, it's around 24W (12V * 2A).
9. Garantia i Suport
For any questions, technical support, or warranty claims, please contact your retailer or the manufacturer directly. Refer to the product packaging or purchase documentation for specific contact information.
A user manual in PDF format is also available for download: View Manual d'usuari (PDF).





