GY20852 Mower Blades Fit for John Dee re D140 48" Deck, GX21784 Gator Mulching Blades Compatible with John Dee re 48in Lawn Tractor D150 D160 D155, Replace for GX21786 AM141035, 3 Pack

What It Is

This is a 3-pack of Gator mulching blades designed to replace OEM blades on John Deere 48-inch lawn tractor decks. They are intended for mulching grass clippings into fine particles that decompose quickly, reducing bagging needs.

Fitment & Compatibility

These blades fit John Deere 48-inch decks (model numbers D140, D150, D155, D160). Before buying, measure your existing blade length—these are 20.5 inches long with a 1-inch center hole and 0.25-inch thickness. They replace OEM part numbers GX21784, GX21786, and AM141035. Do not assume fit if your deck is not a 48-inch model or if your tractor is a different series (e.g., X300, X500). Check your deck’s underside for a model tag or measure the blade span.

Key Things to Buy

• Quality: These are aftermarket Gator-style blades with serrated edges for mulching. They are not OEM but have a 4.6-star rating from 54 reviews—most users report good durability and cut quality.
• Installation Difficulty: Easy—remove the old blade, clean the spindle, and torque the blade bolt to 70–90 ft-lbs. Use a blade lock or block of wood to prevent rotation. No special tools needed.
• Common Gotchas:
  • These blades are for mulching only; they will not give a clean side-discharge or bagging cut.
  • They may be slightly heavier than OEM blades, which can stress the spindle if your deck is older or worn.
  • Verify your deck’s blade bolt size (usually 5/8-inch) before buying.

Should You Buy It

If you own a John Deere D100-series tractor with a 48-inch deck and want to mulch leaves or grass without bagging, this 3-pack is a solid, affordable choice. It’s not for bagging or side-discharge use, and it won’t fit other deck sizes. For the price, it’s a good value if you’re okay with aftermarket quality.