GX22151 Mulching Mower Blades for John Deere 42" Deck Mower, for GY20850 AM137333 AM137328 AM141033, for Windsor 50-3231, for 42" Cut Deck 102 105 115 125 135 100 110 130 Tractor, 2 Pack

What It Is

This is a 2-pack of mulching blades designed for 42-inch John Deere lawn tractors and select Windsor models. They replace OEM part numbers GY20850, AM137333, AM137328, and AM141033, and are intended for fine-clipping mulching on residential turf.

Fitment & Compatibility

Before buying, confirm your mower deck measures exactly 42 inches from blade tip to blade tip. These blades fit John Deere 42" cut decks on models 100, 102, 105, 110, 115, 125, 130, and 135 series tractors, plus Windsor 50-3231. Measure your existing blade length (should be 21 inches tip-to-tip) and center hole size (typically 1 inch). Verify the blade shape matches your deck’s spindle pattern—these are mulching blades with a curved wing, not standard lift blades. Aftermarket replacements work for most residential use, but check that the blade thickness (0.25 inches) matches your OEM spec.

Key Things to Know

• Installation difficulty: Easy for DIYers—you’ll need a socket wrench and a torque wrench (60-70 ft-lbs). Always disconnect the spark plug first.
• Quality note: These are hardened steel with a painted finish. They may dull faster than OEM on rocky or sandy soil, but are fine for typical grass.
• Common gotcha: Mulching blades need sharp edges for proper cut. If your deck has a mulch plug, ensure it’s in place—these blades work best with one.
• Balance check: After installing, spin the blade by hand to confirm it’s not wobbly. Unbalanced blades cause vibration and deck damage.

Should You Buy It

Buy these if you own a compatible 42-inch John Deere or Windsor tractor and want an affordable mulching upgrade for regular lawn care. They’re a solid value for homeowners who mow weekly and prefer fine clippings over bagging. Skip them if you need heavy-duty blades for rough terrain or commercial use—OEM or thicker aftermarket options last longer.