GX22151 GY20850 Lawn Mower Blades Gator Mulching Blades for John Deere 42 Inch Deck Riding Mower Replacement for S100 D110 D130 LA135 AM141033 AM131033 AM137333 AM137328 2Pack

What It Is

This is a set of two Gator mulching blades designed for John Deere 42-inch deck riding mowers. They replace OEM parts AM141033, AM131033, AM137333, and AM137328, and are intended for mulching grass clippings into fine particles that decompose quickly.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck (not a 48- or 54-inch). These blades fit John Deere S100, D100, D110, D130, and LA135 series, but also fit other models with the same deck and spindle pattern. Check your current blade length (should be about 21 inches), center hole size (typically 1 inch), and offset. The Gator-style design is aftermarket, not OEM, so verify your deck’s blade orientation (some John Deere decks require a specific lift angle). If your mower uses a different blade pattern (e.g., 3-in-1 or standard lift), these won’t interchange.

Key Things to Know

• Quality: These are hardened steel with a serrated edge for aggressive mulching. They’re thicker than OEM blades, which can reduce lift in wet grass.
• Installation: Easy with a socket wrench and blade removal tool. Torque to 70-90 ft-lbs. Always disconnect the spark plug and block the blade before working.
• Common gotcha: The Gator design is for mulching only—not for bagging or side discharge. If you switch between modes, you’ll need a standard blade set.
• Durability: Expect 25-50 hours of mowing before sharpening. They’re prone to bending if you hit rocks or stumps.

Should You Buy It

Buy these if you primarily mulch and want finer clippings that don’t clump, especially on a John Deere 42-inch deck. They’re a solid upgrade over OEM blades for mulching performance, but skip them if you need bagging or side-discharge capability, or if your deck has a different blade pattern.