AM137757 GX21784 48 inch Mower Mulching Blade For John Deere 48 inch mower blades Replace John Deere D140 E140 D160 E160 E170 E150 LA145 LA140 LA155 155C 48" Deck GY20852 AM137757 AM141035 (3Pack)

What It Is

This 3-pack of 48-inch mulching blades (AM137757 / GX21784) is designed to replace OEM John Deere blades on select 48-inch deck tractors. They cut grass into fine clippings that decompose quickly, eliminating the need for bagging.

Fitment & Compatibility

Deck size: Only fits 48-inch John Deere mower decks (measure your deck diagonally from spindle to spindle to confirm).
Models confirmed: D140, E140, D160, E160, E170, E150, LA145, LA140, LA155, 155C.
OEM cross-references: GY20852, AM137757, AM141035.
Critical check: Measure your existing blade length (48-inch deck blades are typically 20.5–21 inches long) and center hole diameter (usually 1 inch). These blades have a 1-inch center hole and 5-point star pattern—verify your spindle matches before buying.

Key Things to Know

• Quality vs. OEM: Aftermarket steel may be slightly softer than John Deere factory blades; expect faster dulling if you hit rocks or thick weeds.
• Installation: Simple swap with a socket wrench and torque to 70–90 ft-lbs. Use thread locker if your spindle bolts are loose after previous use.
• Common gotcha: These blades are mulching-only—they lack the lift wings of standard blades, so they won’t discharge or bag well. If you need versatility, stick with OEM or high-lift designs.
• Balance: Out of the box, check blade balance on a nail or balancer; occasional factory imbalances can cause vibration.

Should You Buy It

If you own one of the listed John Deere 48-inch deck tractors and exclusively mulch (never bag or side-discharge), this 3-pack is a budget-friendly option at ~$7 per blade. However, if you regularly mow wet grass, hit debris, or want OEM durability, pay more for John Deere genuine blades. For occasional homeowners with clean lawns, it’s a solid value.