754-04045 Lawn Mower 42" Deck Belt 1/2"X109" for Toro 112-5800 MTD Cub Cadet LT1040, LT1042, RZT42 GT2148 754-04045 LX420 LX426 LX425 Troy-Bilt Bronco

What It Is

This is a 42-inch deck drive belt (1/2" wide, 109" long) for riding lawn mowers, transmitting power from the engine pulley to the mower deck blades. It’s commonly used on Toro, MTD, Cub Cadet, and Troy-Bilt models with 42-inch cutting decks.

Fitment & Compatibility

• Deck size: Only for 42-inch decks. Do not use on 46" or 50" decks.
• Brands/models: Fits Toro 112-5800, Cub Cadet LT1040, LT1042, RZT42, GT2148, LX420, LX426, LX425, and Troy-Bilt Bronco. Also fits MTD and Yard-Man equivalents.
• OEM vs aftermarket: This is an OEM Cub Cadet belt (part #754-04045). Aftermarket alternatives exist but may vary in tension and durability.
• Measurement check: Confirm your belt is 1/2" wide and 109" long. Measure your old belt (lay flat, measure inside length). If it’s worn, it may have stretched—compare to spec.
• Pulley condition: Inspect all pulleys for wear, rust, or damage. A worn pulley will shred a new belt quickly.

Key Things to Know

• Quality: OEM belt, good for standard residential use. Not heavy-duty commercial grade, but reliable for seasonal cutting.
• Installation difficulty: Moderate. You’ll need to remove the deck, route around tensioner and pulleys, and re-tension. A diagram helps—check your manual or online.
• Common gotcha: The belt can slip if the tensioner spring is weak or pulley bearings are shot. Replace the belt and check the tensioner spring at the same time.
• Lifespan: Expect 1-2 seasons with normal use. Heat, debris, and misalignment shorten life.

Should You Buy It

Buy this if you have a 42" deck on a compatible Cub Cadet, Toro, or MTD rider and need a direct OEM replacement for routine maintenance. It’s a good value for the price, but skip it if you have a different deck size or need a heavy-duty belt for commercial mowing.