Oregon 42 Inch Lawn Mower Blades, Gator G3 Blades for 42" Deck, 21-3/8" Length, Replacement for John Deere GX22151, AM137328, AM141033, GY20850, UC21583 and Fits John Deere 102, 115, 125, 135 (2 Pack)

What It Is

This is a 2-pack of Oregon Gator G3 mulching blades for 42-inch lawn mower decks, designed to deliver fine grass clipping for superior mulching on residential John Deere lawn tractors.

Fitment & Compatibility

Before buying, confirm your deck measures exactly 42 inches and your blade length is 21-3/8 inches. These replace OEM numbers GX22151, AM137328, AM141033, GY20850, and UC21583. They fit John Deere models 102, 115, 125, and 135, plus many other tractors with a 42" deck using the same spindle pattern. Always verify your deck model and blade mounting hole pattern (usually a 5-point star or 7-point star) to ensure proper fit.

Key Things to Know

• Mulching performance: The G3’s serrated edge and curved wing design chop clippings finer than standard blades, reducing bagging frequency.
• Installation: Moderate difficulty—requires a socket wrench and blade removal tool. Torque blade bolts to 40-50 ft-lbs. Use thread locker to prevent loosening.
• Sharpening: G3 blades are hardened steel and can be sharpened, but replace when bent or nicked.
• Deck clearance: Check blade tip clearance (should be 1/4" to 3/8" above deck shell) to avoid contact with the deck.
• Balance: After sharpening or replacing, always balance blades to prevent vibration and spindle wear.

Should You Buy It

If you own a compatible John Deere with a 42-inch deck and want better mulching without switching to a dedicated mulching kit, these Gator G3 blades are a solid upgrade. They’re durable, cut clean, and cost less than OEM replacements. Skip them if you primarily bag or side-discharge—standard blades work fine for those tasks.