- This part is in stock in our warehouse and will ship out within 1 business day of the order being placed.
- New stock is on the way! On order parts usually ship within 7 business days.
- Item is not in stock and usually ships 10-15 business days from the time you place your order.
- This item is no longer being made by the manufacturer, and cannot be added to your shopping cart.
Key-Rocking, Lh 139-6644
- Manufactured by:
- Toro
- ERP Number:
- ERP16285180
- Part Number:
- 139-6644
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- Toro
- Lawn Boy
- Lawn Mower
- Engine
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Customer Repair Instructions
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
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Lawn mower left drive wheel was not driving properly.
Patrick from HUBBARD, Ohio
- Difficulty Level:
- Easy
- Total Repair Time:
- 15 - 30 mins
- Tools:
- Pliers, Screw drivers, Socket set, Wrench set
2. Removed the drive mechanism retaining c-clip on both rear wheels.
3. Removed the drive mechanisms.
4. Replaced the parts listed above and completed the repair on both rear wheels.
Note: Washer-Clutch and Ring-friction are the most common wear problems but, I replaced ... Read more most everything since the mower was 7-yr old and still running very good.
Products okay but internet schematic was poor.
Russell from Merrill, Wisconsin
- Difficulty Level:
- A Bit Difficult
- Total Repair Time:
- 15 - 30 mins
- Tools:
- Pliers, Screw drivers, Socket set
Old Gear and related parts displaced while mowing
Mike from Bartlett, Illinois
Rear drive wheel gear and pinion were engaging intermittently due to the wobbling of the wheels. Wobbling of the wheels was caused by excess wear to the wheel bushings.
Daniel from Erie, Pennsylvania
- Difficulty Level:
- Easy
- Total Repair Time:
- 30 - 60 mins
- Tools:
- Pliers, Screw drivers, Socket set
Removed the rear wheel.
Removed the plastic drive gear housing.
Removed pinion gear retaining clip.
Removed the pinion gear.
I replaced other parts on the ends of the wheel drive shaft, but it was not actually necessary.
Installed the new pinion gear.
Installed th ... Read more e pinion gear retaining clip.
Installed the plastic drive gear housing.
Greased the wheel gears, pinion gears, wheel bushings and shoulder bolts liberally.
Replaced the wheel.
Replaced the shoulder bolt.
No problem with product!
Leslie from Kingston, Michigan
The drive shaft key way was worn on one side and did not engage properly
Roderick from Lansdale, Pennsylvania
- Difficulty Level:
- A Bit Difficult
- Total Repair Time:
- 1- 2 hours
- Tools:
- Pliers, Socket set, Wrench set
Remove belt drive cover.
Remove spring from belt drive.
Remove drive belt.
Remove gear drive cover
Remove shaft
Remove pins in shaft.
Remove gear on shaft.
Install in reverse order.
Toro Personal Pace 15 years old self propel really weak
Robert from Overland Park, Kansas
- Difficulty Level:
- A Bit Difficult
- Total Repair Time:
- 1- 2 hours
- Tools:
- Screw drivers, Socket set
Rear axle broke, lost the end nuts etc..
VINCENT from Columbia, Maryland
- Difficulty Level:
- Easy
- Total Repair Time:
- 15 - 30 mins
- Tools:
- Pliers, Screw drivers, Socket set, Wrench set
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Model Cross Reference
Manufacturer Part Number: 139-6644
| Brand | Model Number | Description |
|---|---|---|
| Toro | 07321 | Engine - 07321/Serial: 220000001-220999999 |
| Toro | 10312 | Lawn Mower |
| Toro | 10313 | Lawn Mower - 10313/Serial: 0000001-0999999 |
| Lawn Boy | 11001B | Lawn Mower - Walk-Behind Mower |
| Toro | 11003 | Lawn Mower - 53cm Lawnmower, 2000 |
| Toro | 20020 | Lawn Mower - Recycler Mower, R-21s1 |
| Toro | 20021 | Lawn Mower - 20021/Serial: 9900001-9999999 |
| Toro | 20022 | Lawn Mower - Recycler Mower, R-21s |
| Toro | 20023 | Lawn Mower - Recycler Mower, R-21sb |
| Toro | 20025 | Lawn Mower - Recycler Mower, With Bag |
| Toro | 20027 | Lawn Mower - Recycler Mower, R-21osb |
| Toro | 20028 | Lawn Mower - Recycler Mower |
| Toro | 20029 | Lawn Mower - Recycler Mower |
| Toro | 20040 | Lawn Mower - Super Recycler Mower, Sr-21os |
| Toro | 20042 | Lawn Mower - Super Recycler Mower, Sr-21s |
| Toro | 20043 | Lawn Mower - Super Recycler Mower, Sr-21sb |
| Toro | 20044 | Lawn Mower - Super Recycler Mower, Sr-21os |
| Toro | 20045 | Lawn Mower - Super Recycler Mower, Sr-21se |
| Toro | 20060 | Lawn Mower - Recycler Mower |
| Toro | 20061 | Lawn Mower - Recycler Mower, With Bag |
| Toro | 20091 | Lawn Mower - 20091/Serial: 290000001-290999999 |
| Toro | 20091C | Lawn Mower - 20091c/Serial: 290000001-290999999 |
| Toro | 20092 | Lawn Mower - Lawn Mower |
| Toro | 20092C | Lawn Mower - Lawn Mower |
| Toro | 20095 | Lawn Mower - Lawn Mower |
| Toro | 20095C | Lawn Mower - Lawn Mower |
| Toro | 20099 | Lawn Mower - Lawn Mower |
| Toro | 20106 | Lawn Mower - Lawnmower |
| Toro | 20107 | Lawn Mower - Lawnmower |
| Toro | 20210 | Lawn Mower - Lawnmower |
Some of the parts we sell are eligible for mail-in rebates since we can recycle them. We will display any applicable rebates in your shopping cart. To redeem your rebate, contact Customer Service after you have received your part.