John Deere Original Equipment Mower Blade Kit #AM141040

What It Is

The John Deere Original Equipment Mower Blade Kit #AM141040 is a set of two (2) factory-authorized replacement blades designed for 42-inch and 48-inch cutting decks on select John Deere lawn tractors and zero-turn mowers. These blades are intended for residential turf and light-duty commercial mowing.

Fitment & Compatibility

Before buying, verify your machine’s deck size and model number. This kit fits:

• 42-inch decks: Models LX277, LX280, LX285, LX288, LX289, LX290, LX292, LX296, LX297, LX298, LX299, LX300, LX301, LX302, LX303, LX304, LX305, LX306, LX307, LX308, LX309, LX310 (some may require blade adapter #M155344).
• 48-inch decks: Models 425, 445, 455, 757, 317, 318, 322, 330, 332, 335, 345, 355D, 355G, 420, 430, 445, 455, 757, 917, 925, 935, 945, 955, 965, 975, 995, X304, X320, X324, X340, X360, X380, X384, X390, X394, X485, X495, X595 (check deck serial number for exact fit).
• Blade dimensions: 20.5 inches long, 2.5 inches wide, 0.25 inches thick, with a 5/8-inch center hole and a 3/4-inch offset. Measure your current blade to confirm length and hole size.

Critical check: This is an OEM part, not aftermarket. It will not fit non-John Deere decks or older models with different blade lengths (e.g., 38-inch, 54-inch decks). If your deck uses a different blade adapter or spindle, the kit may require a separate adapter (sold separately).

Key Things to Know

• Quality: Factory-grade high-carbon steel with a heat-treated edge. Stays sharp longer than budget blades but will dull faster on rocky soil or heavy debris.
• Installation difficulty: Moderate—requires a socket wrench and a torque wrench (recommended torque: 70-90 ft-lbs). No special tools beyond a blade removal tool or a block of wood to hold the blade.
• Common gotchas:
  • The blades are directional—install with the curved ends pointing upward toward the deck.
  • Do not overtighten; stripped spindles are a common repair.
  • If your deck has a blade adapter, you may need to reuse it or buy a new one (part #M155344 for 42-inch decks).
• Warranty: John Deere OEM parts carry a 1-year warranty against defects.

Should You Buy It

Buy this kit if you own one of the listed John Deere models and want a guaranteed fit with factory-grade durability. It’s ideal for residential mowing on standard turf and avoids the guesswork of aftermarket blades. Skip it if you have a different brand, a non-listed deck size, or a tight budget—aftermarket options (e.g., Oregon, Stens) may cost half