GY20850 GX22151 Mulching Blades for 42" John Deere Mower Deck X300 D100 D105 D110 D130 S100 S120 E100 LA115 Replaces AM137328 AM141033 AM137333 (2 Pack)

What It Is

This is a 2-pack of mulching blades designed for 42-inch John Deere mower decks. They replace OEM parts AM137328, AM141033, and AM137333, and are intended for machines like the X300, D100 series, D105, D110, D130, S100, S120, E100, and LA115. The mulching design cuts grass into finer clippings that decompose quickly, eliminating the need for bagging.

Fitment & Compatibility

Before buying, confirm your deck size is exactly 42 inches—measure from blade tip to blade tip if unsure. These blades fit John Deere models listed above, but double-check your specific model number (e.g., D105 vs. D110) as some share decks while others don’t. Measure your current blade’s length, width, and center hole diameter (typically 1-inch round or 7-point star). The OEM numbers (AM137328, AM141033, AM137333) are a direct cross-reference. If your mower uses a different blade pattern (e.g., 7-point star vs. oval hole), these won’t fit.

Key Things to Know

• Quality: Made from heat-treated steel; sharp out of the box but may require balancing before install (check with a blade balancer).
• Installation: Easy DIY with a socket wrench and torque to 70-90 ft-lbs. Use a blade removal tool if possible to prevent spinning.
• Common Gotchas: Mulching blades work best with a mulching plug installed and at a slower ground speed. Don’t use them for side-discharge or bagging—they’ll clog.
• Pack Size: 2-pack covers one deck; replace both blades at once for even wear and balance.

Should You Buy It

If you own a 42-inch John Deere with a compatible model and want finer clippings for a cleaner lawn without bagging, this is a solid, budget-friendly alternative to OEM blades. Not ideal if you need high-lift or bagging blades—stick to the OEM equivalents for those tasks.