eReplacementParts.com
877-346-4814
Toro Parts
Preferred Partners of
Repair Parts Home  Lawn Equipment Parts  Toro Parts  139-6644 Key-Rocking, Lh
photo thumbnailphoto thumbnailphoto thumbnail360 degree photo thumbnail

Key-Rocking,​ Lh

Part Number: 139-6644
ToroLawn Boy
Availability: 13 in stock
Price: $8.62
Ships within 1 business day

*This part replaces obsolete part #: 66-6050 (Not Illustrated) and 614446.

Product Information
Manufacturer: Toro, Lawn Boy
Product Number: 139-6644
Classification: Part
Weight: 0.01 lbs.
Shipping: Ships Worldwide
Frequently Purchased With
Compatibility

This part is compatible with the following machines:

Toro
20011 (210000001-210999999)(2001) Lawn Mower
20020 (9900001-9999999)(1999) Lawn Mower
20020 (210000001-210999999)(2001) Lawn Mower
20021 (9900001-9999999)(1999) Lawn Mower
20021 (200000001-200999999)(2000) Lawn Mower
20021 (210000001-210999999)(2001) Lawn Mower
20022 (9900001-9999999)(1999) Lawn Mower
20022 (200000001-200999999)(2000) Lawn Mower
20022 (210000001-210999999)(2001) Lawn Mower
20023 (210000001-210999999)(2001) Lawn Mower
20023 (200000001-200999999)(2000) Lawn Mower
20023 (9900001-9999999)(1999) Lawn Mower
20023C (210000001-210999999)(2001) Lawn Mower
20025 (200000001-200999999)(2000) Lawn Mower
20025 (210000001-210999999)(2001) Lawn Mower
20025 (9900001-9999999)(1999) Lawn Mower
20027 (9900001-9999999)(1999) Lawn Mower
20027 (200000001-200999999)(2000) Lawn Mower
20027 (210000001-210999999)(2001) Lawn Mower
20028 (9900001-9999999)(1999) Lawn Mower
20028 (200000001-200999999)(2000) Lawn Mower
20028 (210000001-210999999)(2001) Lawn Mower
20029 (9900001-9999999)(1999) Lawn Mower
20035 (210000001-210999999)(2001) Lawn Mower
20036 (220000001-220999999)(2002) Lawn Mower
20036 (230000001-230999999)(2003) Lawn Mower
20036 (240000001-240999999)(2004) Lawn Mower
20037 (220000001-220999999)(2002) Lawn Mower
20037 (230000001-230999999)(2003) Lawn Mower
20037 (240000001-240999999)(2004) Lawn Mower
20038 (220000001-220999999)(2002) Lawn Mower
20038 (230000001-230999999)(2003) Lawn Mower
20038 (240000001-240999999)(2004) Lawn Mower
20039 (220000001-220999999)(2002) Lawn Mower
20039 (230000001-230999999)(2003) Lawn Mower
20039 (240000001-240999999)(2004) Lawn Mower
20040 (210000001-210999999)(2001) Lawn Mower
20040 (200000001-200999999)(2000) Lawn Mower
20040 (9900001-9999999)(1999) Lawn Mower
20042 (210000001-210999999)(2001) Lawn Mower
20042 (200000001-200999999)(2000) Lawn Mower
20042 (9900001-9999999)(1999) Lawn Mower
20043 (210000001-210999999)(2001) Lawn Mower
20043 (200000001-200999999)(2000) Lawn Mower
20043 (9900001-9999999)(1999) Lawn Mower
20044 (99000001-99999999)(1999) Lawn Mower
20045 (210000001-210999999)(2001) Lawn Mower
20045 (200000001-200999999)(2000) Lawn Mower
20045 (9900001-9999999)(1999) Lawn Mower
20046 (210000001-210999999)(2001) Lawn Mower
20046 (200000001-200999999)(2000) Lawn Mower
20048 (210000001-210999999)(2001) Lawn Mower
20054 (250000001-250999999)(2005) Lawn Mower
20054 (260000001-260999999)(2006) Lawn Mower
20054 (270000001-270999999)(2007) Lawn Mower
20055 (250000001-250999999)(2005) Lawn Mower
20055 (260000001-260999999)(2006) Lawn Mower
20055 (270000001-270999999)(2007) Lawn Mower
20056 (250000001-250999999)(2005) Lawn Mower
20056 (260000001-260999999)(2006) Lawn Mower
20056 (270000001-270999999)(2007) Lawn Mower
20057 (250000001-250999999)(2005) Lawn Mower
20057 (260000001-260999999)(2006) Lawn Mower
20058 (250000001-250999999)(2005) Lawn Mower
20058 (260000001-260999999)(2006) Lawn Mower
20060 (9900001-9999999)(1999) Lawn Mower
20061 (9900001-9999999)(1999) Lawn Mower
20062 (270000001-270999999)(2007) Lawn Mower
20091 (280000001-280999999)(2008) Lawn Mower
20091C (280000001-280999999)(2008) Lawn Mower
20092 (280000001-280999999)(2008) Lawn Mower
20092 (290000001-290999999)(2009) Lawn Mower
20092 (310000001-310020057)(2010) Lawn Mower
20092 (310020238-310999999)(2010) Lawn Mower
20092C (280000001-280999999)(2008) Lawn Mower
20092C (290000001-290999999)(2009) Lawn Mower
20092C (310000001-310999999)(2010) Lawn Mower
20093 (280000001-280999999)(2008) Lawn Mower
20093 (290000001-290999999)(2009) Lawn Mower
20093C (280000001-280999999)(2008) Lawn Mower
20093C (290000001-290999999)(2009) Lawn Mower
20095 (280000001-280999999)(2008) Lawn Mower
20095 (290000001-290999999)(2009) Lawn Mower
20095 (310000001-310004268)(2010) Lawn Mower
20095 (310004923-310999999)(2010) Lawn Mower
20095C (280000001-280999999)(2008) Lawn Mower
20095C (290000001-290999999)(2009) Lawn Mower
20095C (310000001-310999999)(2010) Lawn Mower
20099 (280000001-280999999)(2008) Lawn Mower
20099 (290000001-290999999)(2009) Lawn Mower
20099 (310000001-310000309)(2010) Lawn Mower
20106 (1000001-1999999)(1991) Lawn Mower
20106 (2000001-2999999)(1992) Lawn Mower
20107 (1000001-1999999)(1991) Lawn Mower
20107 (2000001-2999999)(1992) Lawn Mower
20210 (1000001-1999999)(1991) Lawn Mower
20210 (2000001-2999999)(1992) Lawn Mower
20211 (1000001-1999999)(1991) Lawn Mower
20214 (1000001-1999999)(1991) Lawn Mower
20214 (2000001-2999999)(1992) Lawn Mower
20216 (1000001-1999999)(1991) Lawn Mower
20218 (1000001-1999999)(1991) Lawn Mower
20218 (2000001-2999999)(1992) Lawn Mower
20219 (1000001-1999999)(1991) Lawn Mower
20320 (2000001-2999999)(1992) Lawn Mower
20321 (2000001-2999999)(1992) Lawn Mower
20322 (2000001-2999999)(1992) Lawn Mower
20324 (2000001-2999999)(1992) Lawn Mower
20325 (2000001-2999999)(1992) Lawn Mower
20327B (2000001-2999999)(1992) Lawn Mower
20328B (2000001-2999999)(1992) Lawn Mower
20432 (39000001-39999999)(1993) Lawn Mower
20434 (3900001-3999999)(1993) Lawn Mower
20434 (4900001-4999999)(1994) Lawn Mower
20436 (39000001-39999999)(1993) Lawn Mower
20436 (49000001-49999999)(1994) Lawn Mower
20436WF (39000001-39999999)(1993) Lawn Mower
20437 (39000001-39999999)(1993) Lawn Mower
20437 (49000001-49999999)(1994) Lawn Mower
20438 (49000001-49999999)(1994) Lawn Mower
20438 (39000001-39999999)(1993) Lawn Mower
20438WF (39000001-39999999)(1993) Lawn Mower
20439 (39000001-39999999)(1993) Lawn Mower
20439 (49000001-49999999)(1994) Lawn Mower
20439WF (39000001-39999999)(1993) Lawn Mower
20442 (5900001-5999999)(1995) Lawn Mower
20442 (6900001-6999999)(1996) Lawn Mower
20444 (5900001-5999999)(1995) Lawn Mower
20444 (6900001-6999999)(1996) Lawn Mower
20448 (7900001-7999999)(1997) Lawn Mower
20452 (8900001-8999999)(1998) Lawn Mower
20454 (6900001-6999999)(1996) Lawn Mower
20457 (7900001-7999999)(1997) Lawn Mower
20458 (7900001-7999999)(1997) Lawn Mower
20462 (5900001-5999999)(1995) Lawn Mower
20462 (6900001-6999999)(1996) Lawn Mower
20463 (5900001-5999999)(1995) Lawn Mower
20463 (6900001-6999999)(1996) Lawn Mower
20464 (5900001-5999999)(1995) Lawn Mower
20464 (6900001-6999999)(1996) Lawn Mower
20464 (7900001-7999999)(1997) Lawn Mower
20465 (6900001-6999999)(1996) Lawn Mower
20465 (5900001-5999999)(1995) Lawn Mower
20465 (790000001-799999999)(1997) Lawn Mower
20466 (6900001-6999999)(1996) Lawn Mower
20466 (5900001-5999999)(1995) Lawn Mower
20470 (7900001-7999999)(1997) Lawn Mower
20472 (6900001-6999999)(1996) Lawn Mower
20473 (6900001-6999999)(1996) Lawn Mower
20474 (6900001-6999999)(1996) Lawn Mower
Expand the 150+ compatible machines
Products Compatibility

This item works with the following types of products:

  • • Lawn Mower
Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
1 of 1 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Locking Ring Clip - 65-2720
Thrust Washer - 65-4740
Key-Rocking, Rh - 139-6643
Key-Rocking, Lh - 139-6644
Friction Ring - 65-4710
Clutch Washer - 65-4760
Pinion Gear - 65-4750
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Pliers, Socket set, Wrench Set
Lawn mower left drive wheel was not driving properly.
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?
Thanks for voting and helping fellow customers!
1 of 1 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Bolt-Shoulder - 92-1057
Thrust Washer - 65-4740
Key-Rocking, Rh - 139-6643
Key-Rocking, Lh - 139-6644
Pinion Gear - 65-4750
Spring-Compression - 65-4720
Spacer-Cover, Wheel - 74-1671
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers, Socket set
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.
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.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Lawn Mower
Parts Used:
Bushing - 27-6250
Bolt-Shoulder - 92-1057
Thrust Washer - 65-4740
Key-Rocking, Lh - 139-6644
Friction Ring - 65-4710
Clutch Washer - 65-4760
Pinion Gear - 65-4750
Spacer-Cover, Wheel - 74-1671
Repair Difficulty:
Medium
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Pliers, Socket set
Products okay but internet schematic was poor.
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?
Thanks for voting and helping fellow customers!
Tool Type:
Lawn Mower
Parts Used:
Locking Ring Clip - 65-2720
Thrust Washer - 65-4740
Key-Rocking, Lh - 139-6644
Friction Ring - 65-4710
Washer-Arm, Pivot - 65-4730
Pinion Gear - 65-4750
Cover-Wheel - 94-1609
Repair Difficulty:
Medium
Time Spent Repairing:
15-30 minutes
Tools Used:
Socket set, Wrench Set, No additional tools
No problem with product!
Removed rear wheel replaced lost parts!
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Toro Personal Pace 15 years old self propel really weak
Replaced Transmission, drive belt and all the parts related to the self propel mechanism.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Lawn Mower
Parts Used:
Locking Ring Clip - 65-2720
Thrust Washer - 65-4740
Key-Rocking, Lh - 139-6644
Friction Ring - 65-4710
Washer-Arm, Pivot - 65-4730
Clutch Washer - 65-4760
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Pliers, Socket set, Wrench Set
Rear axle broke, lost the end nuts etc..
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?
Thanks for voting and helping fellow customers!
Tool Type:
Lawn Mower
Parts Used:
Locking Ring Clip - 65-2720
Pin-Groove - 3285-19
Key-Rocking, Rh - 139-6643
Key-Rocking, Lh - 139-6644
Pivot Arm Asm - 100-8774
Shaft-Output - 104-7673
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Pliers, Socket set, Wrench Set
The drive shaft key way was worn on one side and did not engage properly
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?
Thanks for voting and helping fellow customers!
Tool Type:
Lawn Mower
Parts Used:
Locking Ring Clip - 65-2720
Thrust Washer - 65-4740
Key-Rocking, Lh - 139-6644
Friction Ring - 65-4710
Pinion Gear - 65-4750
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Pliers, Socket set
Old Gear and related parts displaced while mowing
Installed new purchased parts. Used schematic provided on ereplacement parts website
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Reviews
5
Average Rating (out of 5):
2 Reviews
Click to filter by ratings:
5 stars
2
4 stars
0
3 stars
0
2 stars
0
1 stars
0
  • Highest Rating
  • Most Recent
< PREV
  • 1
NEXT >
  • 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
    Verified Purchase
    eReplacementParts Team
    • Highest Rating
    • Most Recent
    < PREV
    • 1
    NEXT >
    Product Information
    Manufacturer: Toro, Lawn Boy
    Product Number: 139-6644
    Classification: Part
    Weight: 0.01 lbs.
    Shipping: Ships Worldwide

    Fixing things makes sense...

    ...And we make it easy! With our Fix app, you always have a personalized repair guide on-hand. Easily find manuals and replacement parts on your phone while you’re DIYing in the garage or garden.

    "Love the flexibility of the app to add everything in the home and garage. Access to manuals and parts right there makes it convenient."

    Available on the App Store Get it on Google Play
    eReplacementParts.com
    7036 South High Tech Dr.
    Midvale, UT 84047
    visa mastercard discover american express PayPal