GX20072 Deck Belt for John Deere D100 D105 D110 D125 D130 L100 L110 E100 E110 E120 E130 LA105 LA110 LA115 S100 GY20570 (1/2" x 104")

What It Is

The GX20072 is a replacement deck belt for select John Deere lawn tractors, designed to drive the mower blades from the engine pulley. It’s a direct-fit aftermarket belt for 42-inch and 48-inch cutting decks on popular D100, L100, and E100 series models.

Fitment & Compatibility

Check these before buying:

• Exact model compatibility: Confirmed fit for John Deere D100, D105, D110, D125, D130, L100, L110, E100, E110, E120, E130, LA105, LA110, LA115, S100. Also replaces OEM part GY20570.
• Deck size: Works with 42-inch and 48-inch decks only. Verify your deck size (stamped on deck housing or manual).
• Belt dimensions: 1/2 inch wide x 104 inches long. Measure your old belt end-to-end (not looped) to confirm length.
• OEM vs aftermarket: This is a non-OEM belt. It may be slightly thinner or less flexible than John Deere’s original. Check for correct routing diagram—belt path varies by deck model.
• Year range: Generally fits 2009–2018 models. If your mower is older or newer, cross-check with your machine’s manual.

Key Things to Know

• Installation difficulty: Moderate. Requires removing deck, routing belt around pulleys, and using a belt tensioner tool (or long screwdriver) to release tension. Expect 30–45 minutes.
• Quality: Most users report good durability for residential use (1–2 seasons). Not recommended for heavy commercial mowing—OEM belts last longer under constant load.
• Common gotcha: The tensioner spring can be stiff. Wear gloves and safety glasses. If belt slips after install, double-check routing and pulley alignment.
• Return policy: If it doesn’t fit (wrong length for your deck), return immediately. Measure twice, buy once.

Should You Buy It

This belt is ideal for homeowners with a compatible John Deere tractor who want a budget-friendly replacement for light to moderate residential mowing. It’s a solid value if you’re comfortable with a DIY install and don’t need commercial-grade longevity. If you mow several acres weekly or want maximum durability, spend more on the OEM GY20570.