GX20006 UC30568 Drive Belt for John Deere D110 D140 L120 L110 LA135 LA145 L130 D130 D170 LA115 D160 L111 L108 125 D125 115 155C L118 LA120 LA130 LA175 88.898 inches

What It Is

The GX20006 UC30568 drive belt is an aftermarket replacement for the primary mower deck belt on select John Deere lawn tractors. It transfers power from the engine pulley to the deck spindles to spin the blades.

Fitment & Compatibility

This belt fits a wide range of John Deere models: D110, D140, D130, D170, D160, D125, D100, L120, L110, L130, L118, L111, L108, LA135, LA145, LA115, LA120, LA130, LA175, and 155C, 115, 125. It only fits 42-inch, 48-inch, and 54-inch stamped steel decks – not fabricated decks or 38-inch decks. The belt length is 88.898 inches (outside circumference), width is 1/2 inch, and it uses a standard K-section profile. Before buying, measure your old belt or check your deck model number (stamped on the deck shell). This is not an OEM John Deere belt (OEM part numbers are GX20006 or UC30568), so verify that your mower uses a single belt for all blades (not a two-belt system). It will not work on Zero-Turn mowers or older 300-series tractors.

Key Things to Buy

• Quality: Made from reinforced rubber with aramid cord, it matches OEM tension and durability for residential use. Some users report slightly shorter lifespan than OEM (2-3 seasons vs. 3-4).
• Installation: Moderate difficulty. You must remove the deck, route the belt around all three spindle pulleys and the tensioner, then reinstall the deck. A belt diagram is printed on the deck or in the manual.
• Common gotchas: The belt can be tight to install – use a wrench to relieve tension on the spring-loaded idler pulley. Ensure the belt is seated in all pulley grooves before engaging the blades. Check your deck for worn spindles or pulleys; a bad pulley will shred any belt quickly.
• Price vs. OEM: At $19.99 (vs. $35–$50 for John Deere branded), it’s a solid budget option. If you mow more than 1 acre weekly, consider OEM for longer life.

Should You Buy It

If you own one of the listed John Deere lawn tractors with a 42"–54" stamped deck and want a reliable, affordable replacement for residential use, this belt is a good choice. Avoid it if you need OEM longevity for heavy commercial use or if your deck has a different belt routing.