1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your RAREELECTRICAL Alternator. This alternator is designed as a compatible replacement part for various Yanmar compact tractor models. Please read this manual thoroughly before installation and use to ensure optimal performance and longevity of the unit.
2. Product Description and Features
The RAREELECTRICAL Alternator is a 12-volt, 15-amp unit designed for specific Yanmar compact tractor applications. It features an external regulator, a single-groove pulley, and a permanent magnet design with a "T"-shaped plug for electrical connection. Its robust construction ensures reliable power generation for your tractor's electrical system.
- Voltage: 12 Volts
- Amperage: 15 Amps
- Regulator Type: External
- Pulley Grooves: 1
- Pulley Outer Diameter: 2.559 inches (65 mm)
- Mounting Ear 1: 11.1 mm Unthreaded
- Mounting Ear 2: M8-1.25 Threaded
- Electrical Connection: "T"-shaped plug
- Weight: Approximately 4.72 lbs (2.14 kg)
Figure 2.1: Front view of the RAREELECTRICAL Alternator, showing the pulley and main body.
Figure 2.2: Rear view of the RAREELECTRICAL Alternator, showing the mounting ears and electrical connections.
3. Specifications
| Attribute | Value |
|---|---|
| Manufacturer | RAREELECTRICAL |
| Brand | Rareelectrical |
| Item Weight | 6 pounds (2.72 kg) |
| Product Dimensions | 9 x 9 x 9 inches (22.86 x 22.86 x 22.86 cm) |
| Manufacturer Part Number | 121450-77200*1 |
| OEM Part Number | 121450-77200, 12145077200 |
| Voltage | 12V |
| Amperage | 15 Amps |
| Regulator | External |
| Grooves | 1 |
| Pulley OD | 2.559 inches (65mm) |
| Mounting Ear 1 | 11.1mm Unthreaded |
| Mounting Ear 2 | M8-1.25 Threaded |
| Special Specifications | Permanent Magnet, "T"-Shaped Plug |
4. Compatibility and Applications
This RAREELECTRICAL Alternator is compatible with a wide range of Yanmar compact tractor models. It is crucial to verify your original equipment manufacturer (OEM) part number to ensure proper fitment before installation.
Compatible Yanmar Compact Tractor Models:
- 140, 142, 146, 147
- 169, 180, 186, 187
- 220, 226, 250, 276
- 1401, 1502, 1510
- 1601, 1602, 1610
- 1702, 1720
Note: Always cross-reference the OEM part number (121450-77200 or 12145077200) from your original unit with the specifications provided to confirm compatibility.
5. Installation and Setup
Installation of an alternator requires mechanical aptitude and familiarity with automotive electrical systems. If you are not confident in your abilities, it is highly recommended to seek professional assistance from a qualified mechanic or technician.
Safety Precautions:
- Always disconnect the negative battery terminal first before beginning any work on the electrical system to prevent accidental short circuits or electrical shock.
- Ensure the engine is off and cool before starting work.
- Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Keep all tools and loose clothing away from moving parts.
General Installation Steps (Consult your tractor's service manual for specific instructions):
- Disconnect Battery: Disconnect the negative (-) battery cable, then the positive (+) battery cable.
- Locate Alternator: Identify the existing alternator on your Yanmar compact tractor.
- Disconnect Wiring: Carefully disconnect all electrical connections from the old alternator, noting their positions for reinstallation. This typically includes the main battery cable, field wire, and possibly a sense wire.
- Remove Belt: Loosen the tensioner pulley and remove the serpentine belt or V-belt from the alternator pulley.
- Remove Mounting Bolts: Unbolt the old alternator from its mounting brackets. Note the type and location of each bolt (e.g., 11.1mm unthreaded, M8-1.25 threaded).
- Install New Alternator: Position the new RAREELECTRICAL Alternator into the mounting brackets. Secure it with the appropriate bolts, ensuring proper alignment.
- Install Belt: Reinstall the belt onto the alternator pulley and adjust the tension according to your tractor's specifications.
- Reconnect Wiring: Reconnect all electrical wires to the new alternator, ensuring secure and correct connections.
- Reconnect Battery: Reconnect the positive (+) battery cable, then the negative (-) battery cable.
- Test System: Start the tractor and check the charging system. Observe the battery light on the dashboard and use a voltmeter to confirm proper charging voltage (typically 13.5-14.5 volts).
6. Operating Considerations
Once installed, the alternator operates automatically to maintain the tractor's battery charge and power the electrical system. While there are no specific "operating instructions" for the alternator itself, it is important to monitor your tractor's charging system indicators.
- Battery Warning Light: If the battery warning light on your dashboard illuminates while the engine is running, it indicates a potential issue with the charging system, which could be related to the alternator.
- Voltage Gauge: If your tractor has a voltage gauge, ensure it reads within the normal operating range (typically around 13.5V to 14.5V) when the engine is running.
- Unusual Noises: Listen for any unusual noises (e.g., grinding, squealing) coming from the alternator, which could indicate a problem with the bearings or pulley.
7. Maintenance
Alternators are generally low-maintenance components. However, periodic checks can help ensure their longevity and proper function.
- Belt Inspection: Regularly inspect the drive belt for cracks, fraying, or excessive wear. Ensure it is properly tensioned. A loose belt can cause insufficient charging and squealing noises.
- Wiring Connections: Periodically check all electrical connections to the alternator for corrosion or looseness. Clean any corrosion with a wire brush and battery terminal cleaner. Ensure connections are tight.
- Cleanliness: Keep the alternator free from excessive dirt, oil, and debris. A build-up can lead to overheating and reduced efficiency.
- Battery Health: A healthy battery is crucial for the alternator's proper function. Ensure your tractor's battery is in good condition and holds a charge.
8. Troubleshooting
If you experience issues with your tractor's charging system, consider the following common troubleshooting steps:
| Symptom | Possible Cause | Solution |
|---|---|---|
| Battery warning light on | Loose or worn belt, faulty wiring, dead battery, faulty alternator | Check belt tension and condition. Inspect wiring for damage or corrosion. Test battery. Test alternator output. |
| Dim headlights or accessories | Undercharging, weak battery | Check alternator output voltage. Test battery. |
| Squealing noise from engine bay | Loose or worn belt | Inspect and adjust belt tension or replace belt. |
| Burning smell | Overheating alternator, slipping belt, electrical short | Immediately shut off engine. Inspect alternator for signs of overheating. Check belt. Inspect wiring. Seek professional help. |
If troubleshooting steps do not resolve the issue, it is recommended to consult a qualified technician for diagnosis and repair.
9. Warranty and Support
For specific warranty information regarding your RAREELECTRICAL Alternator, please refer to the documentation provided with your purchase or contact RAREELECTRICAL directly through their official channels. Keep your proof of purchase for warranty claims.
For technical support or further assistance, please contact the manufacturer, Rareelectrical. Contact information can typically be found on their official website or through the retailer where the product was purchased.
