Parts Camp GX20072 John Deere 42 inch Deck Belt Replace John Deere 42 inch D110 E100 D105 D130 L100 L110 L118 L120 L130 LA105 LA115 S100 100 Series Lawn Mower GY20570 Mower Deck Belt 1/2" X 104"

What It Is

This is a replacement drive belt for the 42-inch mower deck on select John Deere 100 Series lawn tractors. It drives the blades and is a direct fit for models like the D110, E100, L100, L120, and others listed.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck and is one of these John Deere models: D110, D100, D105, D130, L100, L110, L118, L120, L130, LA105, LA115, or S100. This belt replaces OEM part numbers GX20072 and GY20570. Measure your old belt: it should be 1/2 inch wide and 104 inches long. If your deck is 42 inches but your belt length differs (e.g., 103.5” or 105”), this belt won’t fit. Aftermarket belt; not John Deere branded, but matches OEM specs.

Key Things to Know

• Quality is solid for the price – users report good durability for residential use, but it may wear faster than OEM under heavy commercial use.
• Installation is moderate – you’ll need to remove the deck or use a belt routing diagram. Check your owner’s manual or online for the correct path around pulleys.
• Common gotcha – the belt can slip if tension is too loose. Ensure the idler pulley moves freely and the belt is fully seated in all grooves.
• Not for zero-turn or 54-inch decks – this is strictly for 42-inch 100 Series tractors. Verify deck size on the mower’s deck sticker.

Should You Buy It

Buy this belt if you need an affordable, direct-fit replacement for your John Deere 100 Series 42-inch mower deck and don’t mind an aftermarket part. It’s a good value for homeowners with light to moderate mowing, but if you mow commercially or want maximum longevity, consider the OEM John Deere belt.