John Deere GY20567 3-in-1 42" Mower Blades Kit L 100 105 107 108 110 Pack of 2

What It Is

The John Deere GY20567 3-in-1 42" Mower Blades Kit (pack of 2) is a factory OEM blade set designed for 42-inch cutting decks on select John Deere L100, L105, L107, L108, and L110 lawn tractors. It supports bagging, mulching, and side-discharge operations, making it a direct replacement for worn or damaged blades.

Fitment & Compatibility

• Deck Size: Only fits 42-inch (107 cm) decks. Measure your deck width before buying.
• Model Fit: Confirmed for John Deere L100, L105, L107, L108, and L110 series. Also fits some D100, D105, D110, D120, and S240 models with 42" decks—check your owner’s manual or existing blade part number.
• OEM vs Aftermarket: This is a genuine John Deere part (OEM), not an aftermarket knockoff. Expect exact fit and balanced weight.
• Measurements: Each blade is approximately 21 inches long, 2.5 inches wide, with a 1-inch center hole and 0.5-inch offset. Verify these against your current blades to avoid return hassles.
• What to Check: Confirm your mower deck model (stamped on deck housing) and that you have a 3-in-1 spindle pattern (two blades, not three or four). If your old blades have a different part number, cross-reference online.

Key Things to Know

• Installation Difficulty: Easy for DIYers. You’ll need a socket wrench (usually 5/8” or 15/16”), a block of wood to jam the blade, and basic safety gear. Torque bolts to 55–65 ft-lbs.
• Quality: OEM steel is heat-treated and balanced out of the box. They last 25–50 hours depending on turf conditions and debris.
• Common Gotchas: Don’t mix with aftermarket blades—OEM may have different offset or thickness. Always replace blades in pairs to avoid vibration. Check spindle bearings if blades wobble after install.
• 3-in-1 Design: The “mulch” setting requires the included mulch plug or kit (not in this pack). The blades work with your mower’s existing discharge chute.

Should You Buy It

If you own a compatible John Deere L100-series or D-series tractor with a 42-inch deck and want a guaranteed fit with no aftermarket guessing, this OEM kit is a solid, durable choice. It’s ideal for homeowners who prioritize reliability over price and don’t mind spending a bit more for factory quality. Avoid if you have a different deck size or prefer budget aftermarket blades.