Lawn mower flywheel key (woodruff key). The flywheel key aligns the flywheel in the correct position on the crankshaft. If the engine stops suddenly due to hitting a hard object, the flywheel key shears in half to prevent damage to the engine. If the flywheel key is broken, the engine won't start.
Grid is 1 inch square
Lawn Mower Flywheel Key 612066
Lawn Mower Flywheel Key 612066
Manufacturer Part

Lawn Mower Flywheel Key 612066

Genuine OEM Part # 612066RC Item # 1606579
Manufacturer Part
Lawn mower flywheel key (woodruff key). The flywheel key aligns the flywheel in the correct position on the crankshaft. If the engine stops suddenly due to hitting a hard object, the flywheel key shears in half to prevent damage to the engine. If the flywheel key is broken, the engine won't start.
Grid is 1 inch square
Lawn Mower Flywheel Key 612066
Lawn Mower Flywheel Key 612066
$2.69
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Lawn mower flywheel key (woodruff key). The flywheel key aligns the flywheel in the correct position on the crankshaft. If the engine stops suddenly due to hitting a hard object, the flywheel key shears in half to prevent damage to the engine. If the flywheel key is broken, the engine won't start.
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$2.69
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This part 612066 is compatible with:

Product Type:
Lawn Mower
Brands:
Exmark, Toro, Lawn Boy

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Flywheel Key Customer Reviews

Common Problems Fixed by the Flywheel Key

Based on customer reports and repair data, this part commonly fixes these issues:

About the Flywheel Key

the flywheel key might have sheared in half. The flywheel key is a small metal piece which fits into the crankshaft and engages with the flywheel. If the lawn mower engine stops suddenly due to hitting a hard object, the flywheel key breaks in half to prevent damage to the engine. If the flywheel key is broken, the lawn mower won't start. To determine if the flywheel key is broken, remove the flywheel from the engine and inspect the flywheel key. If the flywheel key is broken, replace it.