GX20072 42" Lawn Mower Deck Belt Compatible with John Deere D105 D105 D110 D130 E100 E110 E120 L100 L110 L118 L120 L130 LA100 LA115 LA110 S100 100 GY20570 Aramid Deck Belt, 1/2" X 104"

What It Is

This is a 42-inch lawn mower deck belt (1/2" wide, 104" long) that drives the blades on select John Deere 100-series lawn tractors. It replaces OEM part GY20570 and is designed for residential mowing on flat to moderately hilly terrain.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch stamped steel deck, not a 48-inch or larger. This belt fits John Deere models: D105, D110, D130, E100, E110, E120, L100, L110, L118, L120, L130, LA100, LA115, LA110, S100, and 100. Double-check your deck size (measure blade tip to blade tip) and verify your current belt’s length (104 inches) and width (1/2 inch). This is an aftermarket belt, not OEM John Deere, but uses the same GY20570 cross-reference. Not compatible with 54-inch decks or zero-turn mowers.

Key Things to Do

• Measure before ordering – Use a tape measure along the belt path or compare to the old belt. A 104" belt will not fit a 105" or 103" deck.
• Check belt routing – Consult your owner’s manual or a diagram online. Incorrect routing causes slipping or premature wear.
• Verify pulley condition – Worn or damaged pulleys will shred a new belt quickly. Replace any rough or loose pulleys.
• Installation difficulty – Moderate. You’ll need a wrench to release belt tension (spring-loaded idler). Allow 20–30 minutes for first-timers.

Should You Buy It

If you own a compatible 42-inch John Deere 100-series tractor and need a reliable, budget-friendly replacement for a worn GY20570 belt, this is a solid choice. It’s not a premium OEM belt, but it matches the specs, has strong reviews, and works well for typical residential mowing. Avoid if you need a belt for a larger deck or commercial use.