42" Mower Blades GY20850 For John Deere 2PCS- Compatible with D105, D130, S100-S110, S240, X300, E100-E110, LA135 - Replaces AM141033, GX22151, AM131033, AM137333 - Gator Mulching Blades for 42" Deck

What It Is

This is a set of two 42-inch Gator mulching blades, designed for multiple John Deere lawn tractors with a 42-inch cutting deck. They replace OEM part numbers AM141033, GX22151, AM131033, and AM137333, 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 (measure from blade tip to blade tip). These blades fit John Deere models D105, D130, S100–S110, S240, X300, E100–E110, and LA135. They are aftermarket replacements for OEM parts listed above. Check your current blade’s center hole diameter (typically 1 inch) and overall length (21 inches each) to ensure match. Verify your deck’s spindle orientation (straight vs. offset) by comparing to your old blade.

Key Things to Know

• Mulching performance: The serrated “gator” design cuts clippings finer than standard blades, but works best with a mulching plug or kit installed.
• Installation difficulty: Easy for DIY with a socket wrench and blade removal tool; always disconnect spark plug and use jack stands if lifting the mower.
• Durability: Made from heat-treated steel; expect 25–50 hours of use before sharpening, depending on grass conditions and debris.
• Balance check: After installation, spin the blade by hand to ensure no wobble. Unbalanced blades cause vibration and damage spindles.

Should You Buy It

If you own one of the listed John Deere tractors with a 42-inch deck and want an affordable aftermarket mulching upgrade, these blades deliver solid performance. They’re ideal for homeowners who mow frequently and want finer clippings without bagging. Avoid if you need standard lift blades for bagging or side-discharge only.