Easy
30-60 minutes
This is a Genuine OEM Toro Pinion Gear, with 15 teeth, which drives the gear on the wheel. This part is sold individually. There are two of these gears used on the Mowers for the left and right sides. If the gear is showing signs of damage or wear it needs to be replaced.
Pinion Gear 105-3040
OEM part for: Toro, Lawn Boy
Part Number: 105-3040
$5.48
In Stock
Order within the next 12 hours and your part ships today! 
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Compatibility
This part will fit the following 105 machines
Toro
20013 (220000001-220300000)(2002) Lawn Mower View Diagrams & Manuals
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Lawn Boy
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This item works with the following types of products:
- Lawn Mower Parts
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Pinion gear was exact fit and easy to change
Pinio
Guest -
May 21, 2020
Verified Purchase
worked as expected
perfect fit
Daniel -
April 20, 2020
Verified Purchase
parts
seem to have every part I need at a great price
Guest -
September 24, 2019
Verified Purchase
Parts
I’m so glad when I can walk into a store for some big or small parts. And. They have what I need and don’t have to order them and wait a week or so. Thank Ereplacement
Randy -
August 8, 2019
Verified Purchase
Easy to do, need instructions regarding right and left side
Mowers is working like new, no noise.
Guest -
June 4, 2019
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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.
Mower not self propelling.
James - June 3, 2016
👍 40 of 41 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Socket set
Parts Used
Symptoms: Mower has to be pushed, power not engaging, makes a loud ratcheting sound.
Use 13mm socket to remove wheel. Determine it the gear on the mower is worn. Check both wheels to determine if you need to replace the gear on both sides! If you don't you'll end up ordering twice and paying for shipping twice. Also the same gear works on both sides and is marked with an R and L so you will know how to put it on.
Remove c clamp with screwdriver and pliers. Don't bend it. Just press down on the clamp until you can get a grip on it with the pliers and then pull it off.
Remove the washer
Remove the worn out gear. Don't let the little free moving metal tab that engages the gear slip out of its slot or the wheel will not engage when you finish.
Put the new gear on. It has an R on one side and an L on the other. The R goes on the right side as you stand behind the mower, L on the left side.
Reverse the process for the washer and c clamp.
Replace the wheel.
Use 13mm socket to remove wheel. Determine it the gear on the mower is worn. Check both wheels to determine if you need to replace the gear on both sides! If you don't you'll end up ordering twice and paying for shipping twice. Also the same gear works on both sides and is marked with an R and L so you will know how to put it on.
Remove c clamp with screwdriver and pliers. Don't bend it. Just press down on the clamp until you can get a grip on it with the pliers and then pull it off.
Remove the washer
Remove the worn out gear. Don't let the little free moving metal tab that engages the gear slip out of its slot or the wheel will not engage when you finish.
Put the new gear on. It has an R on one side and an L on the other. The R goes on the right side as you stand behind the mower, L on the left side.
Reverse the process for the washer and c clamp.
Replace the wheel.
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Self propelled was not working due to worn down pinion gears.
Greg - September 13, 2017
👍 11 of 11 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set, Gloves
1. Disconnected spark plug. Removed grass bag. Raised mower up on wooden 2x4s to access back wheels (did not tilt mower).
2. Removed left wheel with a socket set.
3. Removed ring clip with screw driver and needle nose pliers.
4. Removed pinion gear and thrust washer while holding down key on shaft. Quickly examined condition of key and didn't replace.
5. Replaced with new pinion gear, new thrust washer and new ring clip. Slid pinion gear on with L on outside (facing direction you would be standing to use mower), thrust washer and put on gloves to push ring clip onto shaft. The pinion gears have L and R engraved on them and are interchangeable.
6. Replaced old wheel with new wheel. Gears on old wheel were worn too. Used socket set to reinstall wheel.
7. Repeated for the right side.
8. Tested and self propelled worked. Although the left wheel would not move when I backed up. I had the tension too tight on the self propelled cable. Loosen nut near handle and eased back on the tension in the cable. Mower backs up and self propelled works like new. Mower is about 12-14 years old and is a Toro Personal Pace.
2. Removed left wheel with a socket set.
3. Removed ring clip with screw driver and needle nose pliers.
4. Removed pinion gear and thrust washer while holding down key on shaft. Quickly examined condition of key and didn't replace.
5. Replaced with new pinion gear, new thrust washer and new ring clip. Slid pinion gear on with L on outside (facing direction you would be standing to use mower), thrust washer and put on gloves to push ring clip onto shaft. The pinion gears have L and R engraved on them and are interchangeable.
6. Replaced old wheel with new wheel. Gears on old wheel were worn too. Used socket set to reinstall wheel.
7. Repeated for the right side.
8. Tested and self propelled worked. Although the left wheel would not move when I backed up. I had the tension too tight on the self propelled cable. Loosen nut near handle and eased back on the tension in the cable. Mower backs up and self propelled works like new. Mower is about 12-14 years old and is a Toro Personal Pace.
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Right side drive wheel was not engaging.
Robert - June 17, 2016
👍 6 of 6 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set
1. Removed right side drive wheel and exposed damaged pinion gear.
2. Key and spring were damaged also.
3. Cleaned key way and spring retaining hole and installed new parts.
4. Installed new pinion gear with thrust washers and spring clips.
5. Installed existing wheel, started mower
2. Key and spring were damaged also.
3. Cleaned key way and spring retaining hole and installed new parts.
4. Installed new pinion gear with thrust washers and spring clips.
5. Installed existing wheel, started mower
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Self propel not working
Richard - April 6, 2016
👍 3 of 3 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Socket set
When we investigated the reason for the self-propel not working, we found numerous parts missing and the gear off the shaft. Replaced parts and reassembled and thankfully it is working like a charm. Just followed the parts diagram. And take your time.
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Grinding noise in left wheel, loss of self propel function
Jim - July 24, 2016
👍 2 of 2 people found this instruction helpful
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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I'm not sure exactly what happened. My wife called me and said that the tire exploded. The plastic hub had twisted up like a straw.
Bert - May 17, 2016
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Pliers, Socket set
I set the lawn mower up on blocks. Installed the spring, set the shafts key over the spring, slid the gear over top. Put the washer in place, used needle nose pliers to lock in the snap ring, put the tire on and used a 1/2" socket to tighten up the tire. Very easy.
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Wheel mount brackets mis-aligned causing gears to mis-align and slip.
Duane - June 21, 2017
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
1-2 hours
Tools Used
Socket set, Snap ring pliers, file, pry bar
1. Removed drive wheels and wheel covers.
2. Remove snap rings and pinion gears.
3. Removed and cleaned woodruff keys and springs.
4. Cleaned axle and keyway.
5. Used file to remove burrs on axle shaft keyway.
6. Used pry bar to straighten wheel mount brackets.
7. Cleaned, lubricated and reinstalled keys and springs.
8. Installed new pinion gears, washers and snap rings.
9. Lubricated gears and installed wheel and cover assembly.
2. Remove snap rings and pinion gears.
3. Removed and cleaned woodruff keys and springs.
4. Cleaned axle and keyway.
5. Used file to remove burrs on axle shaft keyway.
6. Used pry bar to straighten wheel mount brackets.
7. Cleaned, lubricated and reinstalled keys and springs.
8. Installed new pinion gears, washers and snap rings.
9. Lubricated gears and installed wheel and cover assembly.
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Gears were worn
James - December 11, 2015
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Socket set
Parts Used
Remove bolt from wheel, remove wheel. Remove e-ring from in front of the gear, then the washer. Remove the gear. Then install the new gear, and then reverse what you did to get to the gear.
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lawn mower drive wheels would not drive mower forward
Robert - August 2, 2023
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Parts Used
removed wheel bolt,wheel and washers.
removed clip ring and slid worn wheel pinion gear off.
installed new pinion gear and clip ring.
reinstalled wheel bolt,wheel and washers.
repeated for the other drive also.
drive wheels propel mower forward now..
removed clip ring and slid worn wheel pinion gear off.
installed new pinion gear and clip ring.
reinstalled wheel bolt,wheel and washers.
repeated for the other drive also.
drive wheels propel mower forward now..
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Grinding noise in self propell mode
Greg - April 30, 2019
Tool Type
Lawn Mower
Difficulty
Easy
Time
1-2 hours
Tools Used
Socket set, Wrench Set, Snap ring pliers
Parts Used
Drop gearbox down .. Replaced bearings and gears.
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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.
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