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
Part Number: 105-6839
$3.99
In Stock
Ships within 1 business day 
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Compatibility
This Gasket-gearcase will fit the following 132 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
This item works with the following types of products:
- Lawn Mower Parts
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Customer Repair Instructions ?
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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.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
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