GX20249 High Lift Blades for 42" Deck, Compatible with John Dee-re L100 L105 L110 L111 L118 S-cotts L1742 Lawn Mower, Replaces GX20433, GY20567, 2 Pack

What It Is

This is a set of two high-lift replacement blades designed for 42-inch cutting decks, primarily used on John Deere L100-series and S-cotts L1742 lawn tractors. High-lift blades create stronger airflow for better grass discharge and bagging performance compared to standard or low-lift blades.

Fitment & Compatibility

Before buying, verify your deck measures exactly 42 inches from blade tip to blade tip. These blades replace OEM part numbers GX20433 and GY20567, and are listed for John Deere models L100, L105, L110, L111, L118, and S-cotts L1742. Measure your existing blade length (should be ~21 inches), center hole diameter (typically 7/8-inch), and spindle pattern (usually 5-point star). Aftermarket blades may have slight thickness or hole tolerance differences, so check that the blade fits snugly on your spindle without wobble. Not compatible with 38-inch or 48-inch decks.

Key Things to Know

• Installation difficulty: Easy. Requires a socket or wrench to remove the center bolt (usually 5/8-inch or 15/16-inch). Use a block of wood to lock the blade.
• Lift difference: High-lift design increases suction, which improves bagging and side-discharge but can strain the engine on tall, damp grass. Not ideal for mulching.
• Balance check: Aftermarket blades sometimes need balancing. Spin the blade on a nail or balancer; if one side dips, file the heavy side slightly.
• Sharpening: These are pre-sharpened but will dull faster in sandy soil. Resharpen with a file or grinder, maintaining the original angle.

Should You Buy It

Buy these if you have a 42-inch John Deere L100-series or S-cotts L1742 mower and prioritize strong bagging or side-discharge performance. They’re a cost-effective alternative to OEM blades, but check fitment carefully and be prepared to balance them. Not recommended for mulching or very thick, wet grass.