1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your Toro Genuine OEM Rear Wheel Drive (RWD) Transmission, part number 139-6561. This transmission is designed for specific Toro 22-inch Recycler Lawn Mower models. Adhering to these instructions will help ensure optimal performance and longevity of the component.
2. Safety Information
Always prioritize safety when working with lawn mower components. Failure to follow safety precautions can result in serious injury or damage to equipment.
- Disconnect Spark Plug: Before performing any maintenance or installation, always disconnect the spark plug wire to prevent accidental engine startup.
- Read Mower Manual: Refer to your specific lawn mower's operator's manual for additional safety guidelines and detailed instructions.
- Wear Protective Gear: Use appropriate personal protective equipment, including gloves and eye protection.
- Secure the Mower: Ensure the lawn mower is stable and cannot move during installation or maintenance.
- Professional Assistance: If you are unsure about any step, consult a qualified service technician.
3. Product Overview
The Toro Genuine OEM RWD Transmission 139-6561 is a critical component for the self-propel function of compatible Toro Recycler lawn mowers. It features a durable design for reliable operation.
Key Features:
- Rear Wheel Drive (RWD) functionality
- Stainless Steel Axle Rod for durability
- Overall length of approximately 20.5 inches
Compatible Lawn Mower Models:
This transmission is compatible with the following 22-inch Recycler Lawn Mower units:
- Model 21462
- Model 21464
- Model 21465 (with SmartStow)
- Model 21466 (Flex-Force Power System 60V MAX)
- Model 21466T (Flex-Force Power System 60V MAX)
- Model 21468 (Flex-Force Power System 60V MAX)
- Model 21771 (55cm Recycler)
- Model 21772 (55cm Recycler)
- Model 21773 (55cm Recycler with SmartStow)
- Model 21864 (Flex-Force Power System 60V MAX 55cm Recycler)
Figure 1: Main view of the Toro RWD Transmission 139-6561. This image shows the complete transmission assembly with the axle rod extending from both sides and the pulley mechanism visible.
Figure 2: Close-up view of the transmission housing, clearly showing the part number label (P) 139-6561 and serial number (S) WB5247496.
4. Setup and Installation
Replacing the RWD transmission requires mechanical aptitude. If you are not comfortable performing this procedure, it is recommended to seek professional assistance.
Required Tools (Typical):
- Wrenches (various sizes)
- Screwdrivers
- Pliers
- Socket set
- Gloves and eye protection
Installation Steps (General Guide):
- Prepare Mower: Ensure the engine is off and cool. Disconnect the spark plug wire. Tilt the mower onto its side with the carburetor facing up to prevent fuel leakage.
- Remove Deck Cover: Carefully remove any deck covers or shields that obstruct access to the transmission area.
- Disconnect Drive Belt: Locate the drive belt connected to the transmission pulley. Release tension and remove the belt.
- Remove Wheels and Axle Supports: Remove the rear wheels. Disconnect any brackets or supports holding the transmission axle in place.
- Remove Old Transmission: Carefully slide the old transmission assembly out of the mower chassis. Note the orientation and routing of any cables or linkages.
- Install New Transmission: Insert the new Toro 139-6561 transmission into position, ensuring the axle rod aligns correctly with the mower's frame.
- Secure Components: Reattach axle supports and brackets. Reconnect the drive belt to the transmission pulley, ensuring proper tension.
- Reinstall Wheels and Covers: Reattach the rear wheels and any removed deck covers or shields.
- Test Operation: Reconnect the spark plug wire. Start the mower and test the self-propel function in a clear area. Ensure smooth engagement and proper drive.
Figure 3: Side view of the transmission, highlighting the pulley mechanism where the drive belt connects.
Figure 4: Close-up of the stainless steel axle rod end, showing the keyway for wheel attachment.
5. Operating Instructions
Once the transmission is correctly installed, its operation is integrated with your lawn mower's self-propel system. Refer to your specific Toro lawn mower's operator's manual for detailed instructions on engaging and disengaging the self-propel feature, as well as general mower operation.
Ensure the drive belt is properly tensioned and free from damage for consistent self-propel performance.
6. Maintenance
Regular inspection and basic maintenance can extend the life of your transmission.
- Periodic Inspection: Annually or every 25 operating hours, inspect the transmission for any signs of damage, leaks, or excessive wear.
- Cleanliness: Keep the transmission housing and surrounding area free from grass clippings, dirt, and debris. This prevents overheating and potential damage to seals.
- Drive Belt Check: Regularly inspect the drive belt for cracks, fraying, or stretching. Replace if necessary, following your mower's manual.
- Axle Rod Condition: Check the stainless steel axle rod for any bends or corrosion. Ensure the wheels rotate freely on the axle.
- Lubrication: This transmission is typically sealed and does not require user lubrication. Do not attempt to open the transmission housing.
7. Troubleshooting
If you experience issues with your mower's self-propel system after transmission installation, consider the following:
| Symptom | Possible Cause | Solution |
|---|---|---|
| Self-propel not engaging or weak drive | Loose or worn drive belt; incorrect belt routing; damaged pulley; internal transmission issue. | Check belt tension and condition, replace if worn. Verify belt routing. Inspect pulley for damage. If issues persist, professional inspection of the transmission may be required. |
| Mower drags when pulling backward | Drive system not fully disengaging; internal transmission issue. | Ensure drive control lever is fully released. Check for obstructions. If problem continues, consult a service technician. |
| Unusual noises from transmission area | Worn gears or bearings; foreign object interference. | Stop mower immediately. Inspect for debris. If noise persists, professional diagnosis is recommended. |
| Wheels not turning evenly or one wheel not driving | Axle keyway damage; wheel attachment issue; internal differential problem. | Inspect wheel attachment and axle ends. If the issue is internal to the transmission, replacement may be necessary. |
8. Specifications
- Part Number: 139-6561
- Type: Rear Wheel Drive (RWD) Transmission
- Axle Material: Stainless Steel
- Overall Length: Approximately 20.5 inches (52 cm)
- Manufacturer: Toro
- Vehicle Service Type: Lawn Mower
- Compatible Mower Wheel Size: 22 Inches
9. Warranty and Support
As a Genuine OEM part, this Toro transmission is covered by Toro's standard warranty for replacement parts. Please retain your proof of purchase. For specific warranty details, claims, or technical support, please contact Toro customer service or visit the official Toro website.
You can find more information and contact details on the Toro Store on Amazon or the official Toro corporate website.
