GX20072 GY20570 Mower Deck Belt Compatible with John Dee-re L100 L102 L105 L107 L108 L110 L111 L115 L118 L120 LA100 LA105 LA110X110 X120 X145 D100 D110 D120 Sabre 14.542GS 1/2" X 104"

What It Is

This is a 1/2-inch wide, 104-inch long mower deck belt designed to transfer power from the engine pulley to the cutting blades on select John Deere 100-series, LA-series, X-series, D-series, and Sabre lawn tractors. It’s an aftermarket replacement for OEM part numbers GX20072 and GY20570.

Fitment & Compatibility

Check these before buying:

• Deck size: Fits 42-inch and 48-inch cutting decks (common on L100, LA100, X110, D100 models). Verify your deck’s belt routing diagram—some 42” and 48” decks use different belt lengths.
• Model list: Compatible with John Deere L100–L120, LA100–LA110, X110–X145, D100–D120, and Sabre 14.542GS. Not all “L” or “LA” models (e.g., L130, LA140) use this belt—double-check your machine’s manual.
• Measurements: Belt is 1/2” wide x 104” outside length. Measure your old belt’s length and width to confirm; a 1/2” width is standard for these decks.
• OEM vs aftermarket: This is a non-OEM belt. It may be slightly stiffer or less flexible than OEM, but most users report it works fine for residential mowing.

Key Things to Know

• Quality: Made from rubber/cord material. Expect 1–3 seasons of use depending on mowing frequency, debris, and deck cleanliness. Not as durable as OEM but a solid budget option.
• Installation: Moderate difficulty. You’ll need to remove the deck or at least the belt guard, release tension from the idler pulley, and route the belt per the deck diagram. A wrench and a pry bar or belt tool help.
• Common gotchas: The belt can be tight to install—don’t force it; ensure the idler is fully released. If your deck has a spring-loaded tensioner, check that the spring isn’t stretched or broken. Also, this belt may not fit decks with unusual pulley configurations (e.g., 54-inch decks).
• Price: At $9.99, it’s about half the cost of an OEM belt. Good value if you mow a standard lawn and don’t need heavy-duty commercial use.

Should You Buy It

Yes, if you have a compatible John Deere or Sabre tractor with a 42” or 48” deck and want a budget-friendly replacement for residential mowing. Skip it if you need a belt for heavy commercial use, a non-listed model, or a deck with a different belt length—measure first to avoid wasting time.