Replacement Lawn Mower Tractor 42" Deck V Belt Fits Cub Cadet Troy-Bilt MTD Massey Ferguson 754-04045 954-04045, 490-501-M019, LT1042, RZT 42, LT1040; Toro 112-5800, LX420, LX426, LX427

What It Is

This is a replacement V-belt for the 42-inch cutting deck on select Cub Cadet, Troy-Bilt, MTD, Massey Ferguson, and Toro lawn tractors and zero-turn mowers. It drives the deck blades from the engine pulley and is a wear item that needs periodic replacement.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: This belt is for 42-inch decks only. Check your deck’s stamped model number or measure cutting width.
• OEM cross-references: It replaces Cub Cadet/Troy-Bilt/MTD 754-04045, 954-04045, and 490-501-M019, plus Toro 112-5800. It fits models like the LT1040, LT1042, RZT 42, LX420, LX426, and LX427.
• Belt dimensions: Measure your old belt’s length (end-to-end) and width (typically 1/2 inch). If your belt is longer or shorter, this won’t work. The belt is aftermarket, not OEM, but meets OEM specs.

Key Things to Know

• Quality: Rated 4.4/5—most users report good fit and durability, but a few note it may be slightly stiffer than OEM. Inspect for fraying or cracks after the first few hours.
• Installation difficulty: Moderate. You’ll need to remove the deck or mower belt guard, release tension from the idler pulley, and route the belt per your mower’s diagram (included in manual or online). A spring puller helps.
• Common gotchas: The belt may appear loose if the deck is not level or if the idler spring is worn. Always replace the belt with the deck off and check pulley condition. Do not use on 46-inch or 54-inch decks.
• Price: At $14.24, it’s a budget-friendly alternative to OEM belts (often $25–35), but may not last as long under heavy use.

Should You Buy It

This belt is a solid choice if you need a quick, affordable replacement for a 42-inch deck on a Cub Cadet, Troy-Bilt, MTD, or Toro tractor and are comfortable with moderate DIY installation. It’s best for homeowners with light to medium mowing duty. If you mow commercially or want maximum longevity, consider an OEM belt instead.