Grasscool L110 42 inch Mower Mulching Blades for John Dee-re L111 L100 L118 L108 42'' Deck Riding Lawn Tractor with Round Mounting Hole Replace GX20249 GX20433 GY20567

What It Is

These are aftermarket mulching blades designed for 42-inch cutting decks on select John Deere riding lawn tractors. They replace OEM part numbers GX20249, GX20433, and GY20567, and are intended for use where a fine mulch (rather than side discharge or bagging) is desired.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: Your mower must have a 42-inch cutting deck. Measure if unsure.
• Mounting hole: These blades have a round mounting hole (not oval or star-shaped). Check your existing blade’s hole shape.
• Model compatibility: Listed for John Deere L100, L108, L110, L111, L118, and similar L-series tractors with a 42" deck. Also fits some LA, D, and X-series models using the same OEM numbers. Verify your specific model and deck size against the OEM part numbers (GX20249, GX20433, GY20567) in your owner’s manual or current blade.

Do not assume fitment based on model name alone—deck size and hole shape vary.

Key Things to Know

• Quality vs. OEM: Grasscool blades are aftermarket steel, typically thinner or less hardened than OEM John Deere blades. They work for mulching but may dull faster or be more prone to bending on rocks/stumps.
• Installation: Easy if you have a socket wrench and blade removal tool. Torque bolts to 30–40 ft-lbs. Lift deck or mower safely—blades are sharp.
• Common gotcha: These are mulching blades only—they have a higher lift and curved design to recut clippings. Do not use if you need side-discharge or bagging performance; they’ll clog or leave clumps.
• Check balance: Aftermarket blades sometimes arrive unbalanced. Spin test or use a balancer before installing to avoid vibration and spindle wear.

Should You Buy It

Buy these if you own a 42" John Deere L-series (or compatible) tractor, want a budget-friendly mulching blade set, and don’t mind replacing them more frequently than OEM. Skip them if you need side-discharge blades, have a different deck size or hole shape, or mow rough terrain where blade durability matters most.