(2PCS) GX22151 Toothed Mulching Lawn Mower Blades - Replace OEM GY20850 AM131033 AM137333 AM141033 - Fits John Deere D100 D110 D125 S100 S130 S240 LA100 LA105 LA120 E120 E130 Z235 - For 42 Inch Deck

What It Is

This is a set of two toothed mulching blades designed for 42-inch cutting decks on select John Deere lawn tractors and zero-turn mowers. They replace OEM blades (GY20850, AM131033, AM137333, AM141033) and are intended for mulching grass clippings into fine particles.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck – this is critical. These blades fit John Deere D100, D110, D125, S100, S130, S240, LA100, LA105, LA120, E120, E130, and Z235 models. Measure your existing blade length (should be ~21 inches tip-to-tip) and check the center hole diameter (typically 1-inch). The GX22151 is an aftermarket replacement – verify your OEM part number matches one of the four listed above. Not compatible with 48-inch or 54-inch decks.

Key Things to Know

• Quality: Aftermarket steel, likely slightly less durable than OEM, but positive reviews (4.7/5) suggest good value for the price.
• Installation: Easy DIY job – use a socket wrench (typically 5/8-inch or 15/16-inch), torque bolts to 45-55 ft-lbs. Lift deck or remove spark plug first for safety.
• Gotcha: Mulching blades require higher engine RPM and finer grass for best results – won’t work well on wet or tall grass. Check blade balance after install; unbalanced blades cause vibration.
• Set includes two blades – enough for a single-spindle 42-inch deck.

Should You Buy It

If you need affordable mulching blades for a 42-inch John Deere lawn tractor and want to avoid OEM markup, this set is a solid choice. It’s ideal for homeowners who mulch regularly and don’t mind aftermarket steel. Skip it if you require OEM durability for heavy commercial use or prefer bagging/discharge blades.