M143520 UC22010 54" Medium Lift Blades for John Deere JD ZTRAK Z375R Z525E Z535M Z540M X380 X390 GX255 GX335 GX345 LX280 X320 X340 X360 X500 EZtrak Z425 Z435 54 inch Deck Zero-Turn Mower, Black

What It Is

This is a set of three 54-inch medium-lift mower blades designed for zero-turn and lawn tractors with a 54-inch deck. They are an aftermarket replacement for OEM part M143520 (and cross-reference UC22010), intended for cutting grass in residential or light commercial use.

Fitment & Compatibility

Before buying, confirm your mower deck size is exactly 54 inches (not 48 or 60). This set fits John Deere models including ZTRAK Z375R, Z525E, Z535M, Z540M, X380, X390, GX255, GX335, GX345, LX280, X320, X340, X360, X500, and EZtrak Z425, Z435. Measure your existing blade length (should be ~18.5 inches), center hole diameter (usually 5/8-inch or 7/16-inch), and check if your deck uses three blades. These are aftermarket, not OEM, but are direct replacements for the listed models. Verify your deck spindle pattern matches (typically 5-point star or round hole).

Key Things to Know

• Medium lift means good for most grass types and mulching, but not ideal for bagging or heavy thatch (use high-lift for that).
• Installation difficulty is moderate—requires a socket wrench, torque to ~40-50 ft-lbs, and a blade removal tool or block of wood to prevent spinning.
• Quality is decent for the price, but some users report blades may need balancing out of the box (check with a blade balancer).
• Common gotcha: Ensure the blade orientation is correct (cutting edge facing up) and that the sail is on the same side as your old blades to avoid poor cut or vibration.

Should You Buy It

If you have one of the listed John Deere 54-inch deck models and want a budget-friendly replacement for standard grass cutting, this set works well. It’s not for heavy-duty commercial use or specialized mulching/bagging needs, but for most homeowners, it’s a solid value.