(3 Pack) Replacement Lawn Mower High Lift Blades for John Deere GY20852 GX21784 AM141035 AM137757, Fits LA140 LA145 LA165 D140 for 48" Deck Mower

What It Is

A set of three aftermarket high-lift blades designed for 48-inch John Deere mower decks. High-lift blades create stronger upward airflow to improve grass clipping discharge and bagging performance, ideal for thick or wet grass.

Fitment & Compatibility

Deck size: Only fits 48-inch decks. Measure your deck width to confirm (blade length should be 16 inches).
Models: Fits LA140, LA145, LA165, D140 – plus any John Deere using OEM part numbers GY20852, GX21784, AM141035, or AM137757.
OEM cross-check: These replace genuine John Deere blades. Verify your current blade part number matches one listed.
Center hole: Check that the center hole diameter (typically 7/8-inch) matches your spindle. Measure if unsure.
Shaft type: For standard 5-point star or round center holes – confirm before buying.

Key Things to Know

• Installation difficulty: Easy – requires a socket wrench and possibly a blade removal tool. Lift and block the deck securely.
• Torque: Tighten blade bolts to 70-90 ft-lbs. Under-tightening can cause blade loss; over-tightening can strip threads.
• Balance: These are not pre-balanced. After installing, spin test for vibration. If needed, balance them with a blade balancer.
• Gotcha: High-lift blades increase engine load and can throw debris farther. Keep bystanders clear and avoid scalping on uneven ground.

Should You Buy It

If you have a 48-inch John Deere LA or D100-series and want better bagging or discharge in tall or damp grass, this is a solid, affordable upgrade. Avoid if you primarily mulch or have a smaller deck – these are specialized for high-lift performance.