Earthtec 954-05078 Deck Belt Replacement for Cub Cadet 50 Inch RZT S50 490-501-C070 ZT1 50 MTD/Troy-Bilt Mustang 754-05078 490-501-M070 Craftsman Z550 Z5600 Zero-Turn Mowers/Aramid Cord Husqvarna

What It Is

This is a 50-inch deck drive belt replacement for select Cub Cadet, MTD, Troy-Bilt, and Craftsman zero-turn mowers. It transfers power from the engine pulley to the deck spindles, driving the blades for cutting grass.

Fitment & Compatibility

Before buying, confirm your mower has a 50-inch deck and check your original part number—this belt replaces OEM numbers 954-05078, 754-05078, 490-501-C070, and 490-501-M070. It fits Cub Cadet RZT S50, ZT1 50, and similar MTD/Troy-Bilt Mustang models. Also listed for Craftsman Z550 and Z5600 zero-turn mowers, but verify belt length (approx. 94.5 inches) and width (1/2 inch) against your old belt. Aftermarket aramid cord construction means it’s not OEM, so fit can vary slightly; measure before installing.

Key Things to Know

• Construction: Aramid cord offers good durability and resistance to stretching, but it may not last as long as OEM Kevlar belts under heavy use.
• Installation: Moderate difficulty—requires removing deck or routing belt around pulleys and tensioner. Use a diagram from your manual to avoid misrouting.
• Common gotchas: Belt can slip if tensioner spring is worn or pulley alignment is off. Check pulleys for damage before replacing.
• Quality: 3.5-star rating from only 9 reviews suggests mixed experiences; some users report premature wear.

Should You Buy It

If you need a budget-friendly replacement for a 50-inch zero-turn deck and you’re comfortable with basic DIY installation, this belt works for occasional mowing. But if you mow rough terrain or heavy grass regularly, consider spending more on an OEM belt for longer life.