( Grid squares measure 1x1 inch )

Key-Rocking, Lh 139-6644

Manufactured by:
Toro
ERP Number:
ERP16285180
Part Number:
139-6644
Original Equipment Manufacturer ?
Special Order

Easy 

30 - 60 mins 

(8 rated repairs) ?

Does this part fit my model?

Need help finding your model number?

Frequently Purchased Together

?

Troubleshooting

This part works with the following brands:
  • Toro
  • Lawn Boy
This part works with the following products:
  • Lawn Mower
  • Engine

Customer Part Reviews

?
5.0
Average Rating (out of 5):
★★★★★
★★★★★
(3 Reviews)
Click to filter by ratings:
  • 5 stars
    3
  • 4 stars
    0
  • 3 stars
    0
  • 2 stars
    0
  • 1 star
    0
  • 1
Sort by:  
Sorry, we couldn't find any existing reviews that matched. Try using some different or simpler keywords.

Questions & Answers

?

Our customer Service team is at the ready daily to answer your part and product questions.

We're sorry, but our Q&A experts are temporarily unavailable.
Please check back later if you still haven't found the answer you need.

Ask our Team

We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.

Does this fit my product?

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.

Easy 

30 - 60 mins 

(8 rated repairs) ?
  • 1
Sort by:  
Sorry, we couldn't find any existing installation instruction that matched.

Lawn mower left drive wheel was not driving properly.

Patrick from HUBBARD, Ohio

4 of 4 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers, 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.
Did you find this story helpful?
Thank you for voting!

Products okay but internet schematic was poor.

Russell from Merrill, Wisconsin

1 person found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers, 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.
Did you find this story helpful?
Thank you for voting!

Old Gear and related parts displaced while mowing

Mike from Bartlett, Illinois

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
Less than 15 mins
Tools:
Pliers, Socket set
Installed new purchased parts. Used schematic provided on ereplacement parts website
Did you find this story helpful?
Thank you for voting!

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

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Pliers, Screw drivers, 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 th 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.
Did you find this story helpful?
Thank you for voting!

No problem with product!

Leslie from Kingston, Michigan

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
15 - 30 mins
Tools:
Socket set, Wrench set
Removed rear wheel replaced lost parts!
Did you find this story helpful?
Thank you for voting!

The drive shaft key way was worn on one side and did not engage properly

Roderick from Lansdale, Pennsylvania

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
1- 2 hours
Tools:
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.
Did you find this story helpful?
Thank you for voting!

Toro Personal Pace 15 years old self propel really weak

Robert from Overland Park, Kansas

0 of 1 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
1- 2 hours
Tools:
Screw drivers, Socket set
Replaced Transmission, drive belt and all the parts related to the self propel mechanism.
Did you find this story helpful?
Thank you for voting!

Rear axle broke, lost the end nuts etc..

VINCENT from Columbia, Maryland

0 of 1 people found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
15 - 30 mins
Tools:
Pliers, Screw drivers, 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.
Did you find this story helpful?
Thank you for voting!
  • 1

Model Cross Reference

This part works with the following models:
ERP Number: ERP16285180
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