11804780-1-M-Toro-131-5399-Gear-pinion, 15t

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11804780-1-S-Toro-131-5399-Gear-pinion, 15t

11804780-2-S-Toro-131-5399-Gear-pinion, 15t

11804780-3-S-Toro-131-5399-Gear-pinion, 15t

11804780-1-S-Toro-131-5399-Gear-pinion, 15t 360 view

Gear-pinion, 15t 131-5399

Manufactured by:: Toro
ERP Number:: ERP11804780
Part Number:: 131-5399

$7.17

★★★★★

7 Reviews

Delivers in 3-5 Business Days!

Easy

15 - 30 mins

(11 rated repairs) ?

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

Product Description

This item has been OEM sourced an is intended to be used with walk-behind lawnmowers from Toro and Lawn Boy. The metal pinion gear attaches the mower\\\'s transaxle and is used to interconnect with the wheel\\\'s gear to rotate the drive wheel. This item is available as an individual replacement part.

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★★★★★

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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

Part# 131-5399 replaces these:

110-9417, 131-0875, 131-5399,

★

Customer Part Reviews

5.0

Average Rating (out of 5):

★★★★★

(7 Reviews)

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★★★★★

Who is easy to fine and works good

The gear was just right right one that I needed. Thanks

Guest - May 1, 2019

Verified Purchase

★★★★★

Great Service

Great service, parts fit beautifully. Thank-you

William - May 4, 2019

Verified Purchase

★★★★★

Worked as expected

Got my parts quickly and hot them replaced..mower runs like a new one!

Guest - June 17, 2019

Verified Purchase

★★★★★

Good replacement

Fast delivery. good product

Guest - September 30, 2019

Verified Purchase

★★★★★

good parts

very happy with this gear,

Guest - May 25, 2020

Verified Purchase

★★★★★

Part worked as described

Easy to install. These allowed me to switch to wheels with metal teeth instead of flimsy plastic to propel the mower.

Guest - July 16, 2021

Verified Purchase

★★★★★

Fit perfectly, back in operation!!

This gear had worn very badly on my mower over the last 10years. Replaceing these has put me back to 100% drive mode. The fit was exact, the packaging was clear etc.

Guest - May 16, 2025

Verified Purchase

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

15 - 30 mins

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Pinion gears and rear wheel gears teeth worn out

GLENN from McMURRAY, Pennsylvania

5 of 5 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 15 - 30 mins
Tools:: Socket set
Parts Used:: 117-4083, 131-5399

Remove the rear wheels by unscrewing the bolts holding them on
Remove the retaining rings from the shaft and remove the worn gears
Install the new gears on the shaft, install the retaining rings
Install the new wheel on the shaft and tighten up the bolts to hold the wheels on

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Pinion gear was worn out

Paul from SOMERSET, Massachusetts

1 person found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 15 - 30 mins
Tools:: Pliers, Wrench set
Parts Used:: 131-5399

Pulled off rear wheels and changed the small gear.

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Snap rings were broken, cogs inside rear wheels worn, and knobs on wheel adjustment were broken

Charles from Youngsville, North Carolina

1 person found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 30 - 60 mins
Tools:: Pliers, Screw drivers, Socket set
Parts Used:: 117-4083, 131-5399, 94-1610, 65-2720, 110-0549

Removed the rear wheels, cleaned area, filed out snap ring grove, installed pinion gears, installed snap rings, and installed wheel. Installed two new nuts in frame to hold rear cover with the screws. All a simple process. You shipped the correct parts on a timely basis. Back cutting grass.

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Drive gears worn and damaging the driven gears.

John from SAINT ALBANS, West Virginia

0 of 1 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 30 - 60 mins
Parts Used:: 131-5399

I replaced both gears. One was seized and I had to use a gear puller to remove the old gear. The other gear came off easily by just pulling with my hand. I cleaned both axels and the gears were easily installed. Do not over expand the clips that secure the gears. I broke one clip and had to go find a replacement. Slightly expand the clip ... Read more

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Gears were stripped

Michael from Pearland, Texas

0 of 1 people found this instruction helpful.

Difficulty Level:: A Bit Difficult
Total Repair Time:: 30 - 60 mins
Tools:: Screw drivers, Socket set
Parts Used:: 131-5399

Pulled both rear wheels. Replaced the pinion gear, reinstalled both rear wheels, but in doing so you have tut o make sure all parts are realigned properly

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Lawn mower drive gears damaged from bent wheel support.

John from Enfield , Connecticut

0 of 1 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 30 - 60 mins
Tools:: Socket set
Parts Used:: 131-5399

1. Remove 2 rear wheels.
2. Remove snap rings from each axle.
3. Remove damaged gears and install new ones.
4. Put snap rings back on.
5. Put wheels back on.
Note- the snap rings are small. The first one I took off flew away and it took me 10 minutes to find it. Otherwise this would be a 15-30 minute ... Read more

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self propelled not working, right rear wheel drive gear broke and pinion gear

richard from WILLOW GROVE, Pennsylvania

0 of 1 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: Less than 15 mins
Tools:: Socket set
Parts Used:: 137-4835, 131-5399

replace pinion gear and rear wheel gear with new parts from ereplacementparts

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Rear wheels workout

JOHN from Houma, Louisiana

0 of 1 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 30 - 60 mins
Tools:: Nutdriver, Pliers, Screw drivers, Socket set
Parts Used:: 42710-VE2-M02ZE, 42672-VE2-800, 42668-VE2-800, 131-5399

Replacing worn parts

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Left rear wheel wouldn\'t drive

William from CRETE, Nebraska

0 of 1 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: Less than 15 mins
Tools:: Socket set
Parts Used:: 131-5399

Took wheel off, removed snap ring, installed new gear, installed snap ring, installed wheel, started lawnmower and mowed part of my acreage.....5 acres..,

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Drive gears where stripped/ worn down on both sides.

Scott from Rosharon, Texas

0 of 1 people found this instruction helpful.

Difficulty Level:: Easy
Total Repair Time:: 15 - 30 mins
Parts Used:: 131-5399

1. Took the rear wheels off, one side at a time.
2. Removed the snap ring and the old pinion gear.
3. Installed the new gear with a little spray of white lithium grease for extra security.
4. Put the wheel back on to finish the job.

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Model Cross Reference

This part works with the following models:

ERP Number: ERP11804780
Manufacturer Part Number: 131-5399

Brand	Model Number	Description
Lawn Boy	10641	Lawn Mower - 20In Mulching/Rear Bagging Lawn Mower
Lawn Boy	10641C	Lawn Mower - 20In Mulching/Rear Bagging Lawn Mower
Lawn Boy	10642	Lawn Mower - 20In Mulching/Rear Bagging Lawn Mower
Lawn Boy	10642C	Lawn Mower - 20In Mulching/Rear Bagging Lawn Mower
Lawn Boy	10644C	Lawn Mower - 20In Mulching/Rear Bagging Lawn Mower
Lawn Boy	10646	Lawn Mower - 20In Mulching/Rear Bagging Lawn Mower
Lawn Boy	10647	Lawn Mower - 20In Mulching/Rear Bagging Lawn Mower
Lawn Boy	10662	Lawn Mower - Insight Lawn Mower
Lawn Boy	10665	Lawn Mower - Insight Lawn Mower
Lawn Boy	10665C	Lawn Mower - Insight Lawn Mower
Lawn Boy	10666	Lawn Mower - Insight Lawn Mower
Lawn Boy	10666C	Lawn Mower - Insight Lawn Mower
Lawn Boy	10672	Lawn Mower - Insight Gold Lawn Mower
Lawn Boy	10673	Lawn Mower - Insight Gold Lawn Mower
Lawn Boy	10682	Lawn Mower - Insight Lawn Mower
Lawn Boy	10684C	Lawn Mower - Insight Lawn Mower
Lawn Boy	10685	Lawn Mower - Insight Lawn Mower
Lawn Boy	10765	Lawn Mower - Insight Platinum Lawn Mower
Lawn Boy	10780	Lawn Mower - Insight Platinum Lawn Mower
Lawn Boy	10785	Lawn Mower - Insight Platinum Lawn Mower
Lawn Boy	10795	Lawn Mower - Insight Platinum Lawn Mower
Lawn Boy	10796	Lawn Mower - Insight Platinum Lawn Mower
Lawn Boy	10797	Lawn Mower - Insight Platinum Lawn Mower
Lawn Boy	10996	Lawn Mower - Insight Lawn Mower
Lawn Boy	10998	Lawn Mower - Insight Lawn Mower
Lawn Boy	17739	Lawn Mower - 21 Inch Walk-Behind Mower
Toro	20192	Lawn Mower - Lawn Mower
Toro	20194	Lawn Mower - Lawn Mower
Toro	20197	Lawn Mower - Lawn Mower
Toro	20199	Lawn Mower - TimeMaster 30 in. Lawn Mower