UDC Parts GX20072 John Deere 42 Inch Deck Belt Replace D110 L110 D105 E100 D130 S100 LA105 L100 D100 E130 L111 E110 E120 D125 125 LA135 LA110 S100 LA120 S120 LA125 UC32283 GY20570 Deck Belt / 104 inch

What It Is

This is a 42-inch deck drive belt (104-inch length) for John Deere lawn tractors, designed to transfer power from the engine pulley to the mower blades. It replaces OEM part numbers UC32283 and GY20570, and fits many popular 100-series models like the D110, L110, D105, E100, D130, S100, LA105, L100, D100, E130, L111, E110, E120, D125, 125, LA135, LA110, S100, LA120, S120, and LA125.

Fitment & Compatibility

Check your deck size first – this belt is specifically for 42-inch mower decks. If your tractor has a 38-inch, 48-inch, or 54-inch deck, it won’t fit. Verify your model’s OEM part number: if it’s UC32283 or GY20570, this UDC belt is a direct replacement. Measure the belt length (104 inches) and width (typically 1/2 inch) to confirm. Aftermarket, but matches OEM specs – no modifications needed. Double-check your mower’s model number on the frame or under the seat; John Deere’s 100-series list above covers most, but not all.

Key Things to Know

• Quality: 4.3 stars from 12,730 reviews – generally reliable, but some users note it wears faster than OEM under heavy use. Inspect for cracks or fraying after 50-100 hours.
• Installation: Moderate difficulty – you’ll need to remove the mower deck, release tension on the idler pulley, and route the belt per your deck diagram. Watch a YouTube video for your specific model.
• Common gotcha: Belt may be slightly tighter than OEM – ensure your idler spring is in good condition. If the belt squeals or slips, check pulley alignment and tension.
• Price: $21.89 is about half the cost of a John Deere OEM belt – good value if you’re not logging heavy commercial hours.

Should You Buy It

Yes, if you need a budget-friendly replacement for a 42-inch John Deere deck on a residential 100-series tractor. It’s a solid choice for occasional mowing (under 2 acres) and saves you money over OEM. For heavy-duty or daily commercial use, consider spending more on a John Deere belt for longer life.