GY20852 Lawn Mower Blades High Lift Blades for John Deere 48 Inch Deck Replacement for AM137757 AM141035 GX21784 GX21786 D140 D160 E140 E170 S140 S160 LA145 Z355E 3Pack

What It Is

The GY20852 is a set of three high-lift lawn mower blades designed for John Deere 48-inch cutting decks. High-lift blades create stronger upward airflow for better grass clipping discharge and bagging performance, ideal for thick or damp grass.

Fitment & Compatibility

Before buying, confirm your deck measures exactly 48 inches from blade tip to blade tip. These blades replace OEM part numbers AM137757, AM141035, GX21784, and GX21786. They fit John Deere models including D140, D160, E140, E170, S140, S160, LA145, and Z355E. Check your deck’s spindle hole size—these require a standard 5-point star center hole. Measure your existing blade length (should be 18.5 inches) and ensure the blade thickness matches (typically 0.25 inches). Not compatible with 42-inch or 54-inch decks.

Key Things to Know

• Installation difficulty: Easy. Requires a socket wrench, torque wrench, and blade removal tool. Tighten bolts to 70–90 ft-lbs.
• Quality: High-lift design improves bagging but increases engine load slightly. Avoid using on sandy or rocky terrain—high-lift blades wear faster than standard blades.
• Common gotcha: Check blade orientation before installing—the lift wing must face upward toward the deck. Installing upside down will cause poor cutting and vibration.
• Pack size: Three blades included, enough for one full deck replacement. Spindles may require new bolts (not included) if rusted.

Should You Buy It

Buy this if you need replacement high-lift blades for a 48-inch John Deere deck and prioritize better bagging or discharge over longer blade life. Avoid if you mow on rough, debris-filled ground—standard lift blades last longer there. For $43.19 with a 4.7-star rating, it’s a solid value for most homeowners.