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Key-Rocking,​ Rh

Part Number: 139-6643
ToroLawn Boy
Availability: 25+ in stock
Price: $8.62
Ships within 1 business day

*This part replaces obsolete part #: 66-6040 (Not Illustrated) and 614445.

Product Information
Manufacturer: Toro, Lawn Boy
Product Number: 139-6643
Classification: Part
Weight: 0.01 lbs.
Shipping: Ships Worldwide
Description:
This is an authentic Toro replacement part that has been sourced from the original manufacturer to be used with walk-behind lawnmowers. The key is used to link the pinion gear and the transaxle. This item fits into the slot on the axle and the keyway in the gear to allow the two parts to rotate in unison. This key is used with the right wheel and is sold as an individual replacement part.
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
3 of 3 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.
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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.
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Tool Type:
Lawn Mower
Parts Used:
Locking Ring Clip - 65-2720
Stepped Washer - 614426
Thrust Washer - 65-4740
Key-Rocking, Rh - 139-6643
Pinion Gear - 65-4750
Spring-Compression - 65-4720
Cover-Wheel - 94-1609
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Socket set, Adjustable Wrench
Self repell not working
Replace the missing and broken parts, with the new parts. The mower running like new.
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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?
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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.
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Tool Type:
Lawn Mower
Parts Used:
Gasket-Cylinder Head - 692249
Wheel Kit - 753-08092
Key-Rocking, Rh - 139-6643
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Power Drill, Socket set, Wrench Set
No self propelled, another mower bad wheels, last mower many parts on engine repaired or replaced
Just did, nothing was too complicated. Taking apart motor was harder to get to, than what it took to replace the gasket.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Product Information
Manufacturer: Toro, Lawn Boy
Product Number: 139-6643
Classification: Part
Weight: 0.01 lbs.
Shipping: Ships Worldwide

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