GX20072 Deck Belt 1/2" x 104" Replacement for John Deere 42" D105 D110 D130 E100 L100 L110 L118 L120 L130 LA105 LA115 S100 100 Series Lawn Mower GY20570 / Aramid Deck Belt

What It Is

This is a 1/2" x 104" aramid-reinforced deck belt designed to drive the mower blades on select John Deere 100-series lawn tractors with 42-inch decks. It replaces OEM part numbers GX20072 and GY20570.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch stamped steel deck and uses a 104-inch long, 1/2-inch wide belt. This fits models: D105, D110, D130, E100, L100, L110, L118, L120, L130, LA105, LA115, S100, and most other 100-series with the 42-inch deck. Double-check your current belt’s part number—if it’s GX20072 or GY20570, this is a direct swap. Not compatible with 48-inch or 54-inch decks, or older LT/GT series tractors.

Key Things to Know

• Aramid construction offers better heat and wear resistance than standard rubber belts, lasting longer under heavy use.
• Installation is straightforward—requires routing around pulleys and the tensioner; a belt diagram is usually printed on the deck or in your manual.
• Measure your old belt before buying: 104 inches is critical; even 1 inch off will cause slipping or poor blade engagement.
• Check pulley condition—worn or seized pulleys can ruin a new belt quickly.

Should You Buy It

If you own a 42-inch deck John Deere 100-series and need a reliable, budget-friendly replacement that outlasts basic rubber belts, this is a solid choice. Avoid it if your deck size is different or you’re unsure of your belt length—measure first.