John Deere Original Equipment 3 Mower Blades #M135589(3)

What It Is

This is a set of three OEM (Original Equipment) John Deere mower blades, part number M135589, designed for cutting grass on mid-sized residential and commercial zero-turn, lawn tractor, and riding mower decks. Each blade measures 20.5 inches long, with a 1-inch center hole and a 2-inch diameter blade hub.

Fitment & Compatibility

Before buying, verify your mower deck size (typically 54 or 60 inches) and model. These blades fit John Deere models including the Z900 series (Z920A, Z930A, Z950A, Z960A), X700 series (X720, X724, X728, X734, X738, X749), 700 series (720, 724, 728, 734, 738, 749), and 500 series (520, 524, 528, 534, 538, 548). They are NOT compatible with 42-inch or 48-inch decks. Check your owner’s manual or measure your existing blade length, center hole diameter, and hub diameter. OEM blades guarantee precise fitment; aftermarket alternatives may require shimming or modification.

Key Things to Know

• Quality: OEM John Deere blades are heat-treated, hardened steel with a balanced design for even cutting and reduced vibration. Expect longer life than generic blades.
• Installation: Moderate difficulty—requires a socket wrench and torque wrench. Torque the center bolt to 70-80 ft-lbs (check your manual). Use a blade removal tool or block the blade to prevent spinning.
• Common Gotchas: These blades are sold as a set of three—do not mix with other part numbers on the same deck. Inspect deck spindles for wear before installing new blades. Always sharpen new blades lightly before first use (OEM blades often come with a protective coating).
• Wear Indicator: Replace blades when the cutting edge is worn more than 1/8 inch or if bent/cracked. Dull blades tear grass, causing brown tips.

Should You Buy It

If you own a compatible John Deere mower and want reliable, long-lasting performance with guaranteed fitment, this OEM set is worth the premium over cheap aftermarket blades. It’s ideal for homeowners or light commercial users who prioritize cut quality and durability over saving a few dollars. For heavy commercial use or non-John Deere decks, consider aftermarket alternatives.