GX20072 42" Mower Deck Belt Fits John Deere - GX20072 / 103.875" Length - for John Deere GY20570 L 100 130 1742 D 100 110 120 130 X 110 125 145 LA 105 D100 D105 D110 D120 D125 D130 E100 E110 E120

What It Is

This is a 42-inch mower deck drive belt, 103.875 inches long, designed to transfer power from the engine pulley to the blade spindles on specific John Deere lawn tractors. It replaces OEM part GX20072 and fits a wide range of Deere L, D, E, X, and LA series mowers with 42-inch stamped decks.

Fitment & Compatibility

Before buying, confirm your deck is 42 inches (measured blade tip to tip). This belt is 103.875 inches in circumference—measure your old belt end-to-end flat (not stretched) to match. It fits John Deere models: GY20570, L100/130, 1742, D100/110/120/130, X110/125/145, LA105, D100/D105/D110/D120/D125/D130, E100/E110/E120. It is an aftermarket belt, not OEM John Deere, but matches OEM part number GX20072. Verify your deck spindle/pulley layout is standard 42-inch (three-spindle, two-blade). If your deck uses a different belt length (e.g., 100-inch), this will not fit.

Key Things to Know

• Quality: Aftermarket belts may wear faster than OEM; check belt thickness and cut edges for fraying. This one has average customer reviews (4.0/5).
• Installation: Moderate difficulty—requires removing deck or belt guard, routing around pulleys and idler arm. Use a diagram or take a photo before removal.
• Common gotcha: Deck belt tension must be correct—too tight strains spindles, too loose slips. Replace idler pulley if worn.
• Length verification: 103.875 inches is precise; a 104-inch belt is not interchangeable. Measure your old belt end-to-end.

Should You Buy It

If you need a budget-friendly replacement for a 42-inch John Deere deck belt and can verify your model and belt length match exactly, this is a solid choice. However, if you prioritize longevity or run a commercial mower, consider an OEM belt. For light residential use, this $10.95 belt will get the job done.