3 Pack GY20852 Mulching Blades with Nut&Washer Replaces GX21784 AM141035 AM137757 GX21785 GX21786 for Deere John 48 Inch EZTrak D140 Z355E E140 D160 LA145 155C E160 E170 LA130 LA140 Decks

What It Is

This is a 3-pack of 48-inch mulching blades designed for select John Deere lawn tractors and zero-turn mowers. Each set includes blade nuts and washers, intended for machines with 48-inch Edge, Fab, or stamped decks used on models like the EZTrak Z355E, D140, E140, and LA130/140 series. The blades chop clippings finely for nutrient recycling, reducing bagging needs.

Fitment & Compatibility

Before buying, confirm your mower has a 48-inch deck—this is non-negotiable. Check your deck model: Edge, Fab, or stamped. This set replaces OEM part numbers GX21784, GX21785, GX21786, AM141035, and AM137757. It fits John Deere models including EZTrak Z355E, Z345R, Z535M, D140, D160, E140, E160, E170, LA130, LA140, LA145, and 155C. Cross-reference your mower’s model number with the deck type; some 48-inch decks (e.g., 7-Iron) use different blades. Measure your existing blade length (center hole to tip) at 24 inches, and check that the center hole diameter matches 1 inch. The included nuts and washers are standard, but verify thread pitch (typically 5/8-18) on your spindle.

Key Things to Know

• Quality: These are aftermarket blades, not OEM. Most users report they cut well and are durable, but some note they may need balancing before installation.
• Installation difficulty: Moderate. You’ll need a socket wrench and a torque wrench to tighten nuts to 50-60 ft-lbs. Lift the deck safely—use jack stands, not just the mower’s lift lever.
• Common gotchas: The blades may sit slightly higher than OEM, reducing cutting height by about 0.25 inch. Check blade alignment after install; if they strike the deck, file down the ends.
• Pack includes: Three blades, three nuts, three washers—enough for one complete deck swap. No extra hardware for spindles.

Should You Buy It

Buy this set if you own a compatible John Deere with a 48-inch deck and want an affordable, ready-to-install mulching solution. It’s ideal for regular homeowners who mow frequently and prefer mulching over bagging. Skip it if you need OEM-exact fit for a commercial deck or if your deck uses a different blade length or hole pattern.