maXpeedingrods 3-Pack GY20852 High Lift Lawn Mower Blades for John Deere 48" Deck - 7-Point Star Center Hole - Fits D140 D150 E140 LA140 S140 Z245 Replaces GX21784 AM137757

What It Is

This is a 3-pack of high-lift lawn mower blades designed for John Deere 48-inch decks. The high-lift profile increases airflow under the deck for better grass clipping discharge and bagging performance, making them ideal for tall or damp grass.

Fitment & Compatibility

Before buying, confirm your deck is exactly 48 inches (measured blade tip to tip). These blades fit John Deere models D140, D150, E140, LA140, S140, and Z245. They replace OEM part numbers GX21784 and AM137757. The center hole uses a 7-point star pattern—check that your spindle matches this, not a 5-point star or round hole. Blade dimensions: 21 inches long, 2.5 inches wide, 0.25 inches thick. Measure your existing blade length and center hole shape to be sure.

Key Things to Know

• High lift = more power draw: These blades require more engine power than standard blades. If your engine struggles or bogs down in thick grass, you may need to mow slower or take smaller passes.
• Installation tip: Torque the center bolt to 40-50 ft-lbs. Use a blade removal tool or block of wood to keep the blade from spinning. Always disconnect the spark plug first.
• Balance check: After installing, check blade balance with a simple balancer (or a nail in the wall). An unbalanced blade causes vibration and premature spindle wear.
• Not for mulching: High-lift blades are designed for side discharge or bagging. If you mulch clippings, look for a low-lift or mulching blade.

Should You Buy It

Buy if you own a compatible John Deere 48-inch deck, frequently bag or side-discharge grass, and need better lift in thick or wet conditions. Skip if you primarily mulch, have a smaller engine (under 20 HP), or need OEM parts for warranty reasons. At $39.99 for three blades, it’s a good value for the performance upgrade.