GX22151 Mower Blade Compatible with John Dee re 42" Riding Mower, GY20850 Mulching Blade Fit for John Dee re 102 125 135 D130 D100 D105 Tractor, Replace for AM137328 AM141033 AM137333, 2 Pack

What It Is

This is a 2-pack of mulching blades designed to replace the standard blades on John Deere 42-inch riding mowers. They are intended for mulching grass clippings (fine cutting for lawn feeding) rather than side-discharge or bagging.

Fitment & Compatibility

Before buying, verify your mower deck is exactly 42 inches (measured blade tip to tip). These blades fit most John Deere 100-series tractors (D100, D105, D110, D125, D130, D135, D140, D150, D155, D160, D170, D175) and select 100/200-series models (102, 125, 135). They replace OEM part numbers AM137328, AM141033, and AM137333. Measure your current blade’s length, width, center hole diameter, and thickness (these are 21.25" long, 2.5" wide, 0.25" thick with a 1" center hole). Check that your mower uses a blade adapter (most Deere 42" decks do) and that the blade’s offset matches your deck’s spindle orientation.

Key Things to Buy

• Quality vs OEM: These are aftermarket blades—good for the price but may not last as long or cut as cleanly as genuine John Deere blades. Expect to replace them more frequently (every 1-2 seasons vs OEM’s 2-3).
• Installation difficulty: Easy—just remove the old blade (use a block of wood to prevent spindle rotation), clean the spindle area, and install the new blade with the sharp edge facing the direction of rotation (usually marked with an arrow). Torque to 70-80 ft-lbs.
• Common gotcha: These are mulching blades, not high-lift bagging blades. If you bag clippings, these will leave more clumps and require slower mowing. For mulching, mow dry grass and keep blades sharp.
• Balance check: Always test blade balance after installation (hang from a nail or use a balancer). Unbalanced blades cause vibration, uneven cuts, and spindle wear.

Should You Buy It

Buy these if you have a 42-inch John Deere riding mower from the 100/200-series, primarily mulch your lawn, and want a budget-friendly 2-pack. They are a solid value for the price, but if you need maximum cut quality or bagging performance, stick with OEM blades.