GX20072 Mower Deck Belt 42 inch Deck Belt for John Dee-re D110 D105 LA115 L100 LA100 LA105 LA110 L130 1742 D 100 110 120 130 X 110 125 145 LA 105 L100 Mower Decks, 1/2" X 104" (GX20072)

What It Is

This is a 42-inch mower deck drive belt (1/2" wide x 104" long) for select John Deere lawn tractors. It transfers power from the engine pulley to the blade spindles, enabling the deck to cut grass. It’s an aftermarket replacement for OEM part GX20072.

Fitment & Compatibility

Check these before buying:

• Deck size: Fits only 42-inch cutting decks. Measure your deck width or check the model number.
• Model fit: Compatible with D100, D105, D110, D120, D130, LA100, LA105, LA110, LA115, L100, L105, L110, L120, L130, X110, X125, X145, and 1742 models. Not all 42" decks use this belt—verify your machine’s year and series.
• OEM vs aftermarket: This is a non-OEM belt. It matches the length (104") and width (1/2") of the original John Deere GX20072 belt. Some users report slight differences in thickness or material feel.
• Measurement: Measure your old belt end-to-end (not looped) to confirm 104 inches. A wrong length will cause slipping or poor blade engagement.

Key Things to Know

• Quality: Most users find it durable for residential use, but it may wear faster than OEM under heavy or frequent mowing. Expect 1-2 seasons with typical weekly cutting.
• Installation difficulty: Moderate. You’ll need to remove the deck or access the belt path from underneath. A belt routing diagram is helpful—check your manual or online.
• Common gotchas: The belt may seem tight initially; it will stretch slightly after a few hours. Ensure tensioner pulley moves freely. If the belt slips, check for worn pulleys or misalignment.
• No warranty support: As an aftermarket part, returns or replacements are handled by the seller, not John Deere. Buy from a reputable seller with good return policy.

Should You Buy It

This belt is a solid budget option for homeowners with a 42" John Deere who need a quick, cost-effective replacement for light to moderate mowing. If you mow heavy grass, have a commercial schedule, or want maximum longevity, consider the OEM John Deere belt instead. For most residential users, it’s a reliable, affordable fix.