2 Mulching Blade Set Compatible with 42 Inch Cut Deck John Deere GX22151, GY20850, AM137333, 102, 105, 115, 125, 135, D100, D105, D110, D120, D120D, D125 and D130

What It Is

A pair of mulching blades designed for 42-inch cut deck John Deere lawn tractors. They replace OEM part numbers GX22151, GY20850, and AM137333, and fit select 100 and D100 series models. Mulching blades feature a curved, high-lift shape that recirculates grass clippings for finer cutting and better nutrient return to the lawn.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: Must be exactly 42 inches (measured blade tip to tip). These blades will not fit 48-inch or 54-inch decks.
• Model compatibility: Confirmed for John Deere models 102, 105, 115, 125, 135, D100, D105, D110, D120, D120D, D125, and D130. Check your mower’s model plate under the seat or on the frame.
• OEM vs aftermarket: These are aftermarket blades, not John Deere OEM. They match the OEM dimensions (length, thickness, center hole), but quality can vary. Measure your current blade’s length (21 inches typically for 42-inch decks) and center hole diameter (usually 1 inch) to confirm.

Key Things to Know

• Installation difficulty: Easy. Lift the deck safely, remove the old blade bolt (left-hand thread on some models), and replace. Torque the bolt to 40-50 ft-lbs.
• Common gotcha: Mulching blades require a mulching plug or kit to work effectively. If your deck has a side discharge, you’ll need to block it or install a mulching baffle.
• Quality note: At $27.98 for a set, these are budget-friendly but may wear faster than OEM blades. Inspect after 10-15 hours of mowing for dulling or bending.
• Balance: Always check blade balance after installation. An unbalanced blade causes vibration and damages the spindle.

Should You Buy It

Right for budget-conscious owners of listed John Deere models who want a mulching upgrade for finer clippings and less bagging. Skip if you need OEM durability for heavy commercial use or if your deck size doesn’t match 42 inches. Good value for light-to-moderate residential mowing.