ZALANA 42" Deck Replacement Lawn Mower Mulching Blades for GX22151 GY20850 AM137328 AM137333 AM141033 - Compatible with John Deere 102 105 115 D100 D110 D125 D130 Lawn Tractor - 2 Pack

What It Is

A set of two aftermarket mulching blades for 42-inch cutting decks, designed to replace OEM parts on select John Deere lawn tractors. These blades chop grass clippings finely and recirculate them into the turf instead of bagging or side-discharging.

Fitment & Compatibility

• Deck size: Only fits 42-inch (107 cm) cutting decks. Measure your deck width before ordering—do not assume from the model number.
• OEM cross-references: Replaces John Deere parts GX22151, GY20850, AM137328, AM137333, and AM141033. Also fits some older AM108846 and AM141033 variants.
• Tractor models: Compatible with John Deere 100 Series (102, 105, 115) and D100 Series (D100, D110, D125, D130). Does not fit X300, X500, or other series without checking blade dimensions.
• Blade specs: Each blade measures 21 inches long, 2.5 inches wide, with a 1-inch center hole and 7/8-inch offset. Verify these numbers against your current blade—especially the center hole diameter and offset direction (some decks use a different twist).
• Not universal: Will not fit non-John Deere decks or smaller/larger deck sizes.

Key Things to Know

• Quality vs. OEM: ZALANA blades are heat-treated steel with a painted finish. They are slightly thinner than OEM John Deere blades—acceptable for mulching but may wear faster in sandy or rocky soil.
• Installation: Straightforward bolt-on replacement using the existing center bolt and washer. No special tools beyond a socket wrench and torque wrench (recommended 40–50 ft-lbs). Ensure the blade is oriented with the cutting edge facing the direction of rotation (usually upward).
• Mulching performance: The blade’s curved wing design lifts grass for a finer cut. Works best with a mulching plug installed and dry, not overly tall grass. For wet or tall grass, bagging or side-discharge may require different blades.
• Common gotcha: The 1-inch center hole fits most John Deere spindles, but some older models (pre-2005) may use a 5/8-inch hole. Check your spindle shaft before buying.

Should You Buy It

If you own a 42-inch John Deere 100 or D100 series and want an affordable mulching blade set without paying OEM prices, this is a solid value. It’s not for heavy-duty commercial use or rocky terrain, but for regular residential mowing on established lawns, it delivers good cut quality and easy installation.