OEM Replacement - for John Deere GX20072 GY20570,Compatible with John Deere 115 125 135 D100 D105 D110 D120 D125 D130 E100 E110 E120 42 inch Mower Deck - Durable, Aramid Cord Belt

What It Is

This is an OEM-replacement aramid cord belt for 42-inch mower decks on select John Deere lawn tractors (100-series and E100-series). It drives the blades via the engine pulley and is designed for residential mowing with moderate duty cycles.

Fitment & Compatibility

Before buying, confirm two things:

1. Deck size: Fits only 42-inch mower decks (not 48-inch or 54-inch). Check your deck model – typically stamped on the deck housing.
2. Model compatibility: Works for John Deere 115, 125, 135, D100, D105, D110, D120, D125, D130, E100, E110, E120. Also replaces OEM part numbers GX20072 and GY20570.
3. Measure your old belt: Length should be approximately 92 inches (check manufacturer spec). Width is 5/8 inch. If your old belt is longer or shorter, this won’t fit.
4. OEM vs aftermarket: This is an OEM replacement (same specs as John Deere original), not a generic. No adapter or modification needed.

Key Things to Know

• Aramid cord construction is stronger than standard rubber belts – resists stretching and heat better for longer life.
• Installation difficulty: Moderate. You’ll need to remove the mower deck, release belt tension (spring-loaded idler pulley), and route the belt around pulleys per diagram. Typical time: 30–60 minutes.
• Common gotcha: The belt routing diagram is often needed – check your deck’s underside for a sticker or search online. Routing wrong can cause slippage or blade damage.
• No spindle or pulley included – this is just the belt. If your pulleys are worn, replace them first to avoid premature belt wear.

Should You Buy It

Buy this if you have a 42-inch John Deere from the listed models and your original belt is cracked, stretched, or slipping. It’s a solid OEM-grade upgrade over basic rubber belts, and the price is competitive. Skip if you need a different deck size or if your pulleys are damaged – fix those first.