Medium
More than 2 hours
This is an authentic replacement part manufactured for use with walk-behind lawnmowers. The gearcase gasket is used to seal the connection between the upper and lower gearcase covers. This gearcase gasket is available as an individual replacement part, please see model diagram for associative parts.
Gasket-gearcase 105-6839
OEM part for: Toro, Lawn Boy
Part Number: 105-6839
$3.99
In Stock
Order within the next 6 hours and your part ships today! 
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Compatibility
This part will fit the following 132 machines
Toro
20001 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20003 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20003 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20005 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20005 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20007 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20012 (220000001-220300000)(2002) Lawn Mower View Diagrams & Manuals
20012 (220300001-220999999)(2002) Lawn Mower View Diagrams & Manuals
20012 (230000001-230999999)(2003) Lawn Mower View Diagrams & Manuals
20012 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20012 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20012 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20013 (220000001-220300000)(2002) Lawn Mower View Diagrams & Manuals
20013 (220300001-220999999)(2002) Lawn Mower View Diagrams & Manuals
20013 (230000001-230999999)(2003) Lawn Mower View Diagrams & Manuals
20013 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20013 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20013 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20014 (220000001-220300000)(2002) Lawn Mower View Diagrams & Manuals
20014 (220300001-220999999)(2002) Lawn Mower View Diagrams & Manuals
20014 (230000001-230999999)(2003) Lawn Mower View Diagrams & Manuals
20016 (220000001-220300000)(2002) Lawn Mower View Diagrams & Manuals
20016 (220300001-220999999)(2002) Lawn Mower View Diagrams & Manuals
20016 (230000001-230999999)(2003) Lawn Mower View Diagrams & Manuals
20016 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20016 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20016 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20017 (220000001-220300000)(2002) Lawn Mower View Diagrams & Manuals
20017 (220300001-220999999)(2002) Lawn Mower View Diagrams & Manuals
20017 (230000001-230999999)(2003) Lawn Mower View Diagrams & Manuals
20017 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20017 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20017 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20018 (220000001-220300000)(2002) Lawn Mower View Diagrams & Manuals
20018 (220300001-220999999)(2002) Lawn Mower View Diagrams & Manuals
20018 (230000001-230999999)(2003) Lawn Mower View Diagrams & Manuals
20019 (230000001-230999999)(2003) Lawn Mower View Diagrams & Manuals
20031 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20041 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20047 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20049 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20051 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20064 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20064 (280000001-280070155)(2008) Lawn Mower View Diagrams & Manuals
20064 (280070156-280999999)(2008) Lawn Mower View Diagrams & Manuals
20065 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20065 (280000001-280072441)(2008) Lawn Mower View Diagrams & Manuals
20065 (280072442-280999999)(2008) Lawn Mower View Diagrams & Manuals
20066 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20066 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20067 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20067 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20068 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20069 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20070 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20071 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20071A (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20072 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20072A (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20073 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20073A (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20074 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20074A (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20075 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20076 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20076A (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20079 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20086 (280000001-280011041)(2008) Lawn Mower View Diagrams & Manuals
20086 (280011042-280999999)(2008) Lawn Mower View Diagrams & Manuals
20087 (280000001-280009000)(2008) Lawn Mower View Diagrams & Manuals
20087 (280009001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20089 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20094 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20096 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20098 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20110 (280000001-280001676)(2008) Lawn Mower View Diagrams & Manuals
20110 (280001677-280999999)(2008) Lawn Mower View Diagrams & Manuals
20110 (290000001-290999999)(2009) Lawn Mower View Diagrams & Manuals
20111 (280000001-280001951)(2008) Lawn Mower View Diagrams & Manuals
20111 (280001952-280999999)(2008) Lawn Mower View Diagrams & Manuals
20111 (290000001-290999999)(2009) Lawn Mower View Diagrams & Manuals
20112 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20113 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20113 (290000001-290999999)(2009) Lawn Mower View Diagrams & Manuals
20655 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20655 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20655 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20655 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20655 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20656 (270000001-270999999)(2007) Lawn Mower View Diagrams & Manuals
20656 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20656 (240000001-240999999)(2004) Lawn Mower View Diagrams & Manuals
20656 (250000001-250999999)(2005) Lawn Mower View Diagrams & Manuals
20656 (260000001-260999999)(2006) Lawn Mower View Diagrams & Manuals
20658 (280000001-280999999)(2008) Lawn Mower View Diagrams & Manuals
20658 (290000001-290999999)(2009) Lawn Mower View Diagrams & Manuals
Lawn Boy
10655 (250000001-250999999)(2005) Gold Series Lawnmower View Diagrams & Manuals
10655 (240000001-240999999)(2004) Gold Series Lawnmower View Diagrams & Manuals
10656 (240000001-240999999)(2004) Gold Series Lawnmower View Diagrams & Manuals
10672 (270000001-270999999)(2007) Insight Gold Lawn Mower View Diagrams & Manuals
10672 (260000001-260999999)(2006) Insight Gold Lawn Mower View Diagrams & Manuals
10672 (250000001-250999999)(2005) Insight Gold Lawn Mower View Diagrams & Manuals
10673 (270000001-270999999)(2007) Insight Gold Lawn Mower View Diagrams & Manuals
10673 (260000001-260999999)(2006) Insight Gold Lawn Mower View Diagrams & Manuals
10682 (270000001-270999999)(2007) Insight Lawn Mower View Diagrams & Manuals
10682 (260000001-260999999)(2006) Insight Lawn Mower View Diagrams & Manuals
10684 (260000001-260999999)(2006) Insight Lawn Mower View Diagrams & Manuals
10684 (250000001-250999999)(2005) Insight Lawn Mower View Diagrams & Manuals
10684C (270000001-270999999)(2007) Insight Lawn Mower View Diagrams & Manuals
10684C (260000001-260999999)(2006) Insight Lawn Mower View Diagrams & Manuals
10684C (250000001-250999999)(2005) Insight Lawn Mower View Diagrams & Manuals
10685 (270000001-270999999)(2007) Insight Lawn Mower View Diagrams & Manuals
10685 (260000001-260999999)(2006) Insight Lawn Mower View Diagrams & Manuals
10685 (250000001-250999999)(2005) Insight Lawn Mower View Diagrams & Manuals
10686 (270000001-270999999)(2007) Insight Lawn Mower View Diagrams & Manuals
10686 (260000001-260999999)(2006) Insight Lawn Mower View Diagrams & Manuals
10686 (250000001-250999999)(2005) Insight Lawn Mower View Diagrams & Manuals
10686C (260000001-260999999)(2006) Insight Lawn Mower View Diagrams & Manuals
10687 (260000001-260999999)(2006) Insight Lawn Mower View Diagrams & Manuals
10695 (270000001-270999999)(2007) Insight Gold Lawn Mower View Diagrams & Manuals
10695 (260000001-260999999)(2006) Insight Gold Lawn Mower View Diagrams & Manuals
10695 (250000001-250999999)(2005) Insight Gold Lawn Mower View Diagrams & Manuals
10696 (260000001-260999999)(2006) Insight Gold Lawn Mower View Diagrams & Manuals
10696 (250000001-250999999)(2005) Insight Gold Lawn Mower View Diagrams & Manuals
10696C (260000001-260999999)(2006) Insight Gold Lawn Mower View Diagrams & Manuals
10696C (250000001-250999999)(2005) Insight Gold Lawn Mower View Diagrams & Manuals
10697 (260000001-260999999)(2006) Insight Gold Lawn Mower View Diagrams & Manuals
10697 (250000001-250999999)(2005) Insight Gold Lawn Mower View Diagrams & Manuals
10995 (270000001-270999999)(2007) Insight Gold Lawn Mower View Diagrams & Manuals
10995 (260000001-260999999)(2006) Insight Gold Lawn Mower View Diagrams & Manuals
10997 (270000001-270999999)(2007) Insight Gold Lawn Mower View Diagrams & Manuals
10997 (260000001-260999999)(2006) Insight Gold Lawn Mower View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Lawn Mower Parts
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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.
Gear box gear broke
Tim - June 3, 2021
Tool Type
Lawn Mower
Difficulty
Hard
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set
1. Had to take rear wheels, and all shafts off wheels { watch half moon keys and springs under}. mark R/L sides. remove gear box
2 take gear box apart
2 a , Had to clean out old grease , clean up gear box
3 take pinion gear out{ can put socket on both ends to unscrew}
4 Didn't have to replace ring gear
5. put grease in gear box , put gear box together
6 reinstall gear box.
7. taking gear box out of mower was hardest part, I watch u-tube 1st ,Kinda made it easier.
8
2 take gear box apart
2 a , Had to clean out old grease , clean up gear box
3 take pinion gear out{ can put socket on both ends to unscrew}
4 Didn't have to replace ring gear
5. put grease in gear box , put gear box together
6 reinstall gear box.
7. taking gear box out of mower was hardest part, I watch u-tube 1st ,Kinda made it easier.
8
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Transmission slipping
Linda - March 10, 2018
Tool Type
Lawn Mower
Difficulty
Easy
Time
1-2 hours
Tools Used
Socket set, Wheel bearing grease.
Opened the transmission, cleaned all the old grease and dirt from every part, put a washer on the drive gear to make up fit the gear wear, packed it with new grease and put it back together. It works again!
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Drive gears worn out.
Roger - June 30, 2017
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Nutdriver
1.Got Toro manual for drive system on line.
2.Disassembled drive system by removing front axle and removing gears from gear box.
3.Ordered gears and gasket from ereplacementparts.
4.Reassembled, greased gear box and axle assembly. Works great.
2.Disassembled drive system by removing front axle and removing gears from gear box.
3.Ordered gears and gasket from ereplacementparts.
4.Reassembled, greased gear box and axle assembly. Works great.
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Grinding noise in left wheel, loss of self propel function
Jim - July 24, 2016
Tool Type
Lawn Mower
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Nutdriver, Adjustable Wrench
Removed back wheels, gears and axel.
Removed mower blade and belt.
Rebuilt transmission and repackaged with grease.
Reassembled and found an extra spacer. Eventually found it went in between the main engine shaft and the blade's shaft-bracket. If you leave this off then the engine won't turn due to clamping friction of the bracket against the engine's bottom.
After reassembling with all new parts and testing, the left wheel gears still sounded bad (grinding). Read different website forums from 2010-now where some people fixed this design/tolerance issue by adding spacers between the left wheel mount and the mower body. I added those and the grinding went away.
Removed mower blade and belt.
Rebuilt transmission and repackaged with grease.
Reassembled and found an extra spacer. Eventually found it went in between the main engine shaft and the blade's shaft-bracket. If you leave this off then the engine won't turn due to clamping friction of the bracket against the engine's bottom.
After reassembling with all new parts and testing, the left wheel gears still sounded bad (grinding). Read different website forums from 2010-now where some people fixed this design/tolerance issue by adding spacers between the left wheel mount and the mower body. I added those and the grinding went away.
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Thanks for voting and helping fellow customers!
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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.
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