Medium
15-30 minutes
The metal blade driver assembly attaches to the blade with the guide belt wrapped around it. The spacer will go inside the driver. This part is used in lawn mowers. If the lawn mower wheels will not turn you may need to replace the blade driver. A wrench will be needed to replace this part if it becomes damaged. The driver is available as an individual replacement item and is an original Toro part.
Blade Driver Asm 106-3987
OEM part for: Toro
Part Number: 106-3987
$33.62
In Stock
Ships within 1 business day 
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Compatibility
This Blade Driver Asm will fit the following 619 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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Blade Driver Asm
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Easy fix
Parts fit perfectly lawnmower works great.
Guest -
July 20, 2022
Verified Purchase
Perfect fit. Back in in working order
Everything was as expected. No trouble installing perfect fit parts. Shipping box was poorly secured. Open at one end with poor taping. Lucky all parts still inside.
Guest -
May 15, 2021
Verified Purchase
Replacement of blade driver arm assembly
Being technically challenged, I found the E Replacement parts site was user friendly. Found the necessary part and chose to call in the order . The part arrived in the prescribed 3 day delivery time. My Toro was back in business in about 45 minutes.
Guest -
April 9, 2020
Verified Purchase
Mower Repair - DIY
The mower was working okay(?) but making a clanging noise at start up and stop. Took it to my preferred small engine shop and was told it was a warped shaft and not worth the cost to repair. I took the thing apart and found the drive pulley was the culprit. $42 dollars and about one hour later, it was as good as new. I expect to get a few more years service out of the mower!
Guest -
March 11, 2020
Verified Purchase
crankshaft hub
arrived quickly and fit like original!
Guest -
December 14, 2019
Verified Purchase
Broken Blade Mount
I was truly impressed how well these parts came together to complete a simple and straight forward repair on my Toro self propelled lawn mower. $40 in parts probably saved me $140 in labor/parts had I taken my mower to a Lawn Equipment repair shop. You guys will be my first stop for future repair
parts in the future.
Steven -
May 26, 2019
Verified Purchase
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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.
Blade driver arm split and lost keyway structure.
Ken - April 4, 2016
👍 11 of 11 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Socket set, Dead Blow Hammer
Parts Used
Remove blade. Tap off old blade driver arm. Place keyway and tap blade driver arm onto shaft. Bolt blade on. You are ready to mow.
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Worn drive belt pulley (made belt replacement ineffective).
thaddeus - August 3, 2018
👍 4 of 4 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Hard
Time
15-30 minutes
Tools Used
Socket set, Gear puller, propane torch
Parts Used
1. Remove belt guard, blade, and belt.
2. Attach gear puller to blade driver assembly (pulley) utilize the blade bolt as a place to set the puller center button.
3. Apply pressure with a wrench to the puller. The puller may or may not be adequate to remove the pulley. In which case apply heat to the pulley assembly just on the sleeve portion of the assembly in front of the pulley. Keep the heat away from the crankcase to avoid heat damage to the seal.
4. Upon removal of the old assembly, you will find a special spacer inside of it required for the new assembly. It may fall out or you may have to tap it out, but remember you will need it.
5. Reverse the procedure for assembling, use a little anti-seize on the crankshaft and use the blade bolt to draw the driver assembly onto the crankshaft.
2. Attach gear puller to blade driver assembly (pulley) utilize the blade bolt as a place to set the puller center button.
3. Apply pressure with a wrench to the puller. The puller may or may not be adequate to remove the pulley. In which case apply heat to the pulley assembly just on the sleeve portion of the assembly in front of the pulley. Keep the heat away from the crankcase to avoid heat damage to the seal.
4. Upon removal of the old assembly, you will find a special spacer inside of it required for the new assembly. It may fall out or you may have to tap it out, but remember you will need it.
5. Reverse the procedure for assembling, use a little anti-seize on the crankshaft and use the blade bolt to draw the driver assembly onto the crankshaft.
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Self drive was not working properly.
Jonathan - August 19, 2016
👍 4 of 5 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Socket set, Gear puller
1. Took the old parts off.
2. Put the new ones on.
3. Had to use a gear puller to remove blade drive assembly.
2. Put the new ones on.
3. Had to use a gear puller to remove blade drive assembly.
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Blade drive assembly
Jeff - October 12, 2021
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
15-30 minutes
Tools Used
Socket set, 32oz hammer
Ruptured drive assembly after running over a well hidden tree stump. Quarter size hole where the keyway used to be. Had to beat the thing with a 32oz
hammer like a mad because of short stroke clearance. ( yes I tried prying with 2x4 and crowbar, dont own a puller big enough). Upon removal I inspected and cleaned the shaft then lubricated it with greaseless spray, inserted the spacer into new drive and aligned the key way and it pushed on about an inch before it stopped cold, placed 2x4 on drive and hit it with aforementioned 32oz hammer like it owed me money, and drive slid right on. Hooked belt and installed blade in the usual way and righted the mower. Let the mower sit for a couple of hours to allow oil to settle, checked oil and gas then cut the grass. BTW pull the plug wire whenever I work on blade end stuff and use cardboard to catch any fluid when turned on side. All in all a $42 repair job on an 8 year old mower beats $400 for a new one.
hammer like a mad because of short stroke clearance. ( yes I tried prying with 2x4 and crowbar, dont own a puller big enough). Upon removal I inspected and cleaned the shaft then lubricated it with greaseless spray, inserted the spacer into new drive and aligned the key way and it pushed on about an inch before it stopped cold, placed 2x4 on drive and hit it with aforementioned 32oz hammer like it owed me money, and drive slid right on. Hooked belt and installed blade in the usual way and righted the mower. Let the mower sit for a couple of hours to allow oil to settle, checked oil and gas then cut the grass. BTW pull the plug wire whenever I work on blade end stuff and use cardboard to catch any fluid when turned on side. All in all a $42 repair job on an 8 year old mower beats $400 for a new one.
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Shield was old and worn and broken
Jamie - April 23, 2020
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Pliers
Parts Used
Removed old rod shield with a pair of pliers then removed the trailing shield. Then replaced the trailing shield and inserted the new rod shield threading it through the trailing shield. Less than 5 minutes only used a pair of pliers.
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Lawn mower was not self-propelling properly
Terry - June 2, 2019
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Pliers, Socket set, Wrench Set
Parts Used
replaced the two parts, then found it was actually the gears on the drive shaft that was causing the problem.
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BLADE DRIVER ADAPTER NEEDED REPLACED ALONG WITH A NEW CUTTING BLADE
KENNETH - May 6, 2019
Tool Type
Lawn Mower
Difficulty
Easy
Time
30-60 minutes
Tools Used
Socket set, HAMMER TO REMOVE OLD DRIVER ADAPTER
PARTS ORDERED FIT PERFECTLY, AFTER REMOVAL OF OLD DRIVER ADAPTER THE NEW PART TAPPED ON THE DRIVE SHAFT WITH THE WELDED IN KEYWAY.. AFTER REPLACING THE BLADE, THE MOWER WAS RETURNED TO IT'S FORMER GLORY AND READY FOR THE NEW CUTTING SEASON
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Struck a rock and ruined the original blade and drive coupling keyway hub for the front wheel drive
Donald - July 18, 2018
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Removed and replaced the mower blade and front wheel drive coupling
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Blade driver became loose because of a loose bolt and damaged the blade driver assembly and blade bolt.
Johnny - July 17, 2018
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Wrench Set
The new parts were installed (slipped on) very easily. The lawn mower now works and I just mowed the front and back yards.
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Blade driver asm broke. Went to sharpen lawn mower and realized spacer-driver was broke and blade driver assembly was broke.
Dennis - May 2, 2018
👍 1 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
1. Put new parts on with the blade that I had sharpened. Changed oil. Every thing went fine.
Parts diagram for replacement parts was a great help.
Parts diagram for replacement parts was a great help.
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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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