Parts Camp 42 Inch Deck GY20850 Mower Blades Replace John Deere GX22151 AM137328 Compatible with X300 D110 D105 E130 E100 Lawn Tractor Zero Turn Riding Mowers Mulching Blades 7-Point Star (2 Pack)

What It Is

This is a 2-pack of 42-inch mulching blades designed for John Deere lawn tractors and zero-turn mowers with a 7-point star center hole. They replace OEM numbers GY22151 and AM137328, and are intended for mulching grass clippings into fine particles that decompose back into the lawn.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck and a 7-point star spindle. These blades fit John Deere models including X300, D110, D105, E130, E100, and many others in those series. Do not assume fitment based on deck size alone—measure your existing blade length (42 inches tip-to-tip) and check the star pattern count. If your spindle uses a different hole shape (e.g., 5-point star, oval, or round), these will not work. For zero-turn models, verify your deck is 42 inches and the spindle matches.

Key Things to Know

• Quality vs. OEM: These are aftermarket blades at a lower price than John Deere OEM. They are generally sharp out of the box but may not hold an edge as long as premium or factory blades.
• Installation difficulty: Easy—just remove the center bolt, swap blades, and torque to spec (typically 40-50 ft-lbs). Use a blade lock or wrench to prevent spinning. Always disconnect the spark plug first.
• Mulching vs. bagging: These blades have a curved, high-lift design optimized for mulching. If you primarily bag clippings, standard lift blades may work better.
• Common gotcha: The 7-point star can be tight on some spindles. If it doesn’t slide on easily, check for burrs or debris; never force it. Also, ensure the blade orientation (cutting edge facing the direction of rotation) is correct before tightening.

Should You Buy It

If you own a compatible 42-inch John Deere lawn tractor or zero-turn and want an affordable mulching blade set for regular use, this is a solid value. It’s not for heavy commercial work or if you need OEM-grade longevity, but for home lawn care, it delivers good performance at roughly half the cost of factory replacements.