Mower Deck Belt for John Deere GX20006 UC30568 D110 D125 D130 D140 D155 D160 D170 S100 S120 S130 S160 LA115 LA145 Lawn Tractor Mower

What It Is

This is a replacement mower deck belt designed for a wide range of John Deere lawn tractors, including the D100, S100, and LA100 series. It drives the blades under the deck and is commonly needed for 42-inch and 48-inch cutting decks.

Fitment & Compatibility

Before buying, verify your tractor model and deck size. This belt fits John Deere models GX20006, UC30568, D110, D125, D130, D140, D155, D160, D170, S100, S120, S130, S160, LA115, and LA145. It’s an aftermarket replacement for OEM part UC30568. Measure your existing belt length (roughly 96.5 inches) and check that your deck is a 42-inch or 48-inch stamped deck—this belt won’t fit wider or fabricated decks. Confirm the belt routing diagram matches your pulley setup before installing.

Key Things to Know

• Quality: This is a budget aftermarket belt. It works, but it may wear faster than a genuine John Deere belt under heavy use or extreme heat.
• Installation: Moderate difficulty—you’ll need to remove the deck, release the belt tensioner, and route the belt around all pulleys. A diagram (often printed on the deck) is essential.
• Common gotcha: The belt can slip or chirp if the tensioner spring is weak or if pulleys are rusty. Clean pulleys and check the tensioner before installing.
• Fit note: This belt is not compatible with 54-inch or 60-inch decks, or with zero-turn mowers.

Should You Buy It

If you need a quick, low-cost fix for a standard 42- or 48-inch John Deere deck and you’re comfortable doing the install yourself, this belt is a solid value. For heavy commercial use or extreme durability demands, consider spending more on the OEM belt.