GX22151 GY20850 Mulching Blades for John Deere D100 D110 D120 D125 D130 Z225 Z235 42 Inch Deck Zero Turn Mower - Heavy Duty Blade Replaces AM141033 AM131033 AM137333-2 Pack

What It Is

This is a set of two heavy-duty mulching blades designed for 42-inch cutting decks on select John Deere lawn tractors and zero-turn mowers. They replace OEM part numbers AM141033, AM131033, and AM137333, and are intended for users who want finer grass clippings for better lawn nutrition without bagging.

Fitment & Compatibility

Before buying, verify your mower has a 42-inch deck—this blade will not fit 48-inch or 54-inch decks. Compatible John Deere models include D100, D110, D120, D125, D130, Z225, and Z235 (both tractor and zero-turn with 42-inch decks). Measure your existing blade: length should be approximately 21 inches (center hole to tip), with a 1-inch center hole and a 0.625-inch (5/8”) spindle hole. These are aftermarket replacements; they match OEM dimensions but are not genuine John Deere parts. Double-check your deck’s blade orientation—mulching blades have a more curved profile than standard lift blades.

Key Things to Know

• Installation difficulty: Easy—requires a socket wrench and blade removal tool (or a block of wood to lock the blade). Torque blade bolts to 40-50 ft-lbs.
• Quality note: At $26.99 for two, these are budget-friendly but rated 4.2/5—some users report they dull faster than OEM blades, especially in sandy or rocky soil.
• Common gotcha: Mulching blades work best with a mulching plug or kit installed on your deck. Without it, you’ll get poor cut quality and clumping.
• Balance check: Always balance new blades before installing; some aftermarket sets may be slightly off, causing vibration.

Should You Buy It

If you own a compatible John Deere with a 42-inch deck and want an affordable mulching upgrade for regular residential mowing, this is a solid value. It’s not for commercial use or heavy-duty conditions—stick with OEM if you need maximum durability or cut precision.