Medium
30-60 minutes
Key-rocking, Lh 139-6644
OEM part for: Toro
Part Number: 139-6644
$8.71
In Stock
Ships within 1 business day 
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Compatibility
This Key-rocking, Lh will fit the following 789 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
This item works with the following types of products:
- Lawn Mower Parts
This part replaces obsolete part #: 66-6050 (Not Illustrated), 614446
Customer Part Reviews ?
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Great telephone Agent's experience and assistance...!
She was soooo helpful in the ordering my needed parts followed by a very easy ordering process!!!
Guest -
October 23, 2023
Verified Purchase
Easy repair and the parts were exactly what I needed.
The parts were in perfect condition.
Guest -
June 29, 2020
Verified Purchase
Repair parts 30 year old mower
Received all my parts as ordered on time. Excellent to deal with
Guest -
June 15, 2020
Verified Purchase
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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.
Lawn mower left drive wheel was not driving properly.
Patrick - August 16, 2017
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set
1. Removed the rear wheel assemblies.
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 most everything since the mower was 7-yr old and still running very good.
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 most everything since the mower was 7-yr old and still running very good.
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Old Gear and related parts displaced while mowing
Mike - June 12, 2019
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Pliers, Socket set
Installed new purchased parts. Used schematic provided on ereplacement parts website
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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 - July 22, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Socket set
Removed rear wheel shoulder bolt.
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 the 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.
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 the 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.
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Products okay but internet schematic was poor.
Russell - September 17, 2021
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set
Took parts off and laid them in a line as I removed. Opened the new parts bags and placed the next to the old parts. Then systematically installed the parts substituting new parts for old.
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No problem with product!
Leslie - July 19, 2020
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Socket set, Wrench Set, No additional tools
Removed rear wheel replaced lost parts!
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Toro Personal Pace 15 years old self propel really weak
Robert - April 20, 2020
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Socket set
Replaced Transmission, drive belt and all the parts related to the self propel mechanism.
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Rear axle broke, lost the end nuts etc..
VINCENT - April 13, 2020
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set
Used the repair guide diagram to determine what washers, nuts etc... I was missing. Then ordered them and used the guide to reinstall. Very thankful. Rather than spending several hundred on a new mower. I fixed mine for about 60 all in. eParts were about $20 plus expedited shipping. Considering covid impact, I was mowing again in a week! Love this place.
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The drive shaft key way was worn on one side and did not engage properly
Roderick - October 6, 2019
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Pliers, Socket set, Wrench Set
Remove both rear wheels.
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.
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.
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Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
