GX20249 GY20567 Mower Blade Compatible with John Dee re 42" Deck, GX20433 High Lift Blades Fit for John Dee re L105 L110 L118 L100 L111 Scotts L1742, Replace for M128485, 2 Pack

What It Is

This is a 2-pack of high-lift mower blades designed to replace OEM part M128485, intended for 42-inch cutting decks on select John Deere lawn tractors and Scotts branded models. High-lift blades create stronger airflow for improved grass discharge and bagging performance.

Fitment & Compatibility

• Deck size: Only fits 42-inch (107 cm) decks. Measure your deck width—common on L100, L110, L118, L120, L130, and Scotts L1742 models.
• OEM replacement: Replaces John Deere part M128485 (also listed as GX20249, GY20567, GX20433). Aftermarket, not genuine Deere.
• Measurements: Blade length is 21 inches (53.3 cm), center hole is a 7-point star (0.625” diameter), with a 0.25” thickness. Check your current blade’s length and hole shape before ordering.
• Model note: Not compatible with 46” or 48” decks, or zero-turn mowers. Verify your tractor’s model number on the frame or under the seat.

Key Things to Know

• High lift vs standard: High-lift blades improve bagging and side-discharge but create more drag. Your engine may struggle on tall, wet grass—use at full throttle.
• Installation: Straightforward with a socket wrench and torque wrench (40-60 ft-lbs). Lift the deck or block the mower securely. Blade bolts often need penetrating oil if rusted.
• Quality: Aftermarket steel; reviews note they’re slightly thinner than OEM but hold an edge well for the price. May need balancing before install—check with a blade balancer.
• Warranty: No warranty from John Deere. Return policy depends on seller, so inspect for warping or defects immediately.

Should You Buy It

Buy this 2-pack if you own a 42” deck John Deere L100 series or Scotts L1742 and want affordable, high-lift blades for bagging or clean cuts. Avoid if you need OEM exactness, have a larger deck, or mow very thick grass regularly—consider genuine Deere blades for heavier duty.