John Deere Original Equipment Mower Blades(M145476) - UC22009,3

What It Is

This is a set of three OEM mower blades (John Deere part M145476) designed for 54-inch and 60-inch John Deere zero-turn mowers (Z600, Z700, and Z900 series). They are for high-production cutting—mulching, bagging, or side-discharge.

Fitment & Compatibility

• Deck size: 54-inch or 60-inch decks only. Check your deck model (e.g., 54SD, 60D).
• Machine series: Z600 (e.g., Z645, Z665), Z700 (e.g., Z720A, Z740A), Z900 (e.g., Z925A, Z930A). Not for older Z200/300 series.
• OEM vs aftermarket: This is genuine John Deere. Aftermarket blades may fit but vary in thickness, hardness, and balance. OEM ensures exact match.
• Measurements: Blade length is 20 inches (center hole to tip). Center hole diameter is 1 inch. Check your old blade’s length and hole size before buying.
• Quantity: Sold as a set of three. If you need only one, buy individually (part M145476).

Key Things to Know

• Installation: Moderate difficulty. You’ll need a socket wrench (usually 15/16″ or 5/8″) and a torque wrench. Torque to 80–100 ft-lbs.
• Sharpness: Factory edges are sharp but not scalpel-like. They cut well out of the box, but sharpen after 10–15 hours for best performance.
• Balance: Each blade is balanced from the factory. If you sharpen, always rebalance to avoid vibration and spindle wear.
• Common gotcha: The blades are directional. The air-lift wing must face up toward the deck. Installing upside down will cause poor cut and excessive vibration.

Should You Buy It

Yes, if you own a late-model John Deere zero-turn with a 54″ or 60″ deck and want guaranteed fit, factory balance, and reliable cutting. For commercial use or heavy mowing, OEM blades last longer and hold an edge better than most aftermarket options. If you’re on a tight budget, aftermarket may work, but expect to replace them more often.