50 Inch Deck PTO Replacement Belt Compatible with Cub Cadet 490-501-C070 754-05078, 954-05078 490-501-C070, Ultima Series ZT1-50, ZT2-50KW and ZT1-50KH; Craftsman CMXGZAM501083, ZS6700, Z550

What It Is

This 50-inch deck PTO replacement belt transfers engine power to the mower deck blades on select Cub Cadet Ultima ZT series and Craftsman Z-series zero-turn mowers. It’s a direct-fit aftermarket belt designed for 50-inch cutting decks, meant to replace worn or broken OEM belts.

Fitment & Compatibility

Before buying, verify your mower’s deck size (must be exactly 50 inches) and check the model number against this list: Cub Cadet Ultima ZT1-50, ZT2-50KW, ZT1-50KH, and Craftsman CMXGZAM501083, ZS6700, Z550. Cross-reference your OEM part number with these: 490-501-C070, 754-05078, 954-05078. Measure your old belt’s length (likely 1/2-inch wide, ~100–105 inches) to confirm. This belt is not for 46- or 54-inch decks.

Key Things to Know

• Quality vs. OEM: Aftermarket belt; may have slightly shorter lifespan than genuine Cub Cadet belts but costs less. Check reviews for durability feedback (currently only 1 review).
• Installation difficulty: Moderate. You’ll need to remove the deck, release tension from the idler pulley, and route around pulleys—allow 30–60 minutes. A belt diagram (often under the deck or in your manual) is essential.
• Common gotchas: Belt may be slightly tight on new pulleys; use a wrench to compress the idler arm. Ensure belt is not twisted before engaging. Verify all pulleys spin freely before reinstalling deck.
• Warranty: Typically no warranty on aftermarket belts; inspect for defects before installing.

Should You Buy It

If you own a compatible 50-inch Cub Cadet Ultima or Craftsman Z-series mower and need a budget-friendly replacement for a worn PTO belt, this is a solid choice. It’s a direct fit for listed models, but with only one review, consider buying from a retailer with a return policy if fitment concerns arise. For heavy commercial use, stick with OEM.