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16285179-1-M-Toro-139-6643-Key-rocking, Rh
16285179-1-S-Toro-139-6643-Key-rocking, Rh 360 view
( Grid squares measure 1x1 inch )
16285179-1-S-Toro-139-6643-Key-rocking, Rh 16285179-2-S-Toro-139-6643-Key-rocking, Rh 16285179-3-S-Toro-139-6643-Key-rocking, Rh 16285179-1-S-Toro-139-6643-Key-rocking, Rh 360 view

Key-rocking, Rh 139-6643

Manufactured by:
Toro
ERP Number:
ERP16285179
Part Number:
139-6643
Original Equipment Manufacturer ?
$10.69
In Stock
Delivers in 3-5 Business Days!

Easy 

1- 2 hours 

(6 rated repairs) ?

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Description Frequently Purchased Together Troubleshooting Questions & Answers Repair Instructions Model Cross Reference

Product Description

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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 Together

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Clutch Washer
★★★★★
★★★★★
(3)
$6.16
Special Order
Minimum Quantity of 2 required
Friction Ring
$6.16
Special Order
Minimum Quantity of 2 required
Washer-arm, Pivot
$6.16
Special Order
Minimum Quantity of 2 required
Spring-compression
★★★★★
★★★★★
(5)
$6.16
Special Order
Minimum Quantity of 2 required
Spacer-cover, Wheel
★★★★★
★★★★★
(1)
$6.16
In Stock
Minimum Quantity of 2 required

Troubleshooting

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

Questions & Answers

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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.

Easy 

1- 2 hours 

(6 rated repairs) ?
  • 1
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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
Parts Used:
139-6644, 139-6643, 65-4740, 65-4750, 65-4760, 65-4710, 65-2720
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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No self propelled, another mower bad wheels, last mower many parts on engine repaired or replaced

Casey from Blue Grass , Iowa

2 of 2 people found this instruction helpful.
Difficulty Level:
A Bit Difficult
Total Repair Time:
1- 2 hours
Tools:
Screw drivers, Socket set, Wrench set
Parts Used:
753-08092, 139-6643, 692249
Just did, nothing was too complicated. Taking apart motor was harder to get to, than what it took to replace the gasket.
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Self repell not working

PETER from Fountain Inn, South Carolina

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Socket set, Wrench (Adjustable)
Parts Used:
139-6643, 65-4740, 94-1609, 65-4750, 65-4720, 65-2720, 614426
Replace the missing and broken parts, with the new parts. The mower running like new.
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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 from Erie, Pennsylvania

1 person found this instruction helpful.
Difficulty Level:
Easy
Total Repair Time:
30 - 60 mins
Tools:
Pliers, Screw drivers, Socket set
Parts Used:
139-6644, 139-6643, 65-4740, 92-1057, 74-1671, 65-4750, 65-4720
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.
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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
Parts Used:
139-6644, 139-6643, 100-8774, 65-2720, 3285-19, 104-7673
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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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
Parts Used:
139-6644, 139-6643, 65-4740, 100-8774, 74-1671, 65-4760, 65-4710, 63-8721
Replaced Transmission, drive belt and all the parts related to the self propel mechanism.
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  • 1

Model Cross Reference

This part works with the following models:
ERP Number: ERP16285179
Manufacturer Part Number: 139-6643
Brand Model Number Description
Toro 07321 Engine - 07321/Serial: 250000001-250999999
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
Key-rocking, Rh
$ 10.69
In Stock
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Stock Status
✖
Mail-In Recycling Rebate

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.

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