754-05078 954-05078 RZT 50-inch Deck Belt Replacement for Cub Ct 754-05078 954-05078 Ultima Series ZT1-50 ZT1-50KW ZT2-50KW ZT1-50KH

What It Is

This is an aftermarket replacement deck belt (50-inch) designed for Cub Cadet RZT and Ultima Series zero-turn mowers. It drives the blades under the cutting deck, replacing OEM belts 754-05078 and 954-05078.

Fitment & Compatibility

Before buying, confirm these three things:

• Deck size: This belt fits only 50-inch cutting decks (not 42, 46, 54, or 60-inch). Measure your deck width if unsure.
• Model compatibility: Fits Cub Cadet RZT 50, Ultima Series ZT1-50, ZT1-50KW, ZT2-50KW, and ZT1-50KH. Not for older RZT models with different deck designs.
• OEM vs aftermarket: This is a non-OEM belt. It matches the dimensions of 754-05078 and 954-05078 but may have slight differences in rubber compound or tension. Measure your old belt length (should be ~92.5 inches) and width (~1/2 inch) to verify.
• Part number: Double-check your mower’s manual or current belt for 754-05078 or 954-05078 marking. If it has a different number, this won’t fit.

Key Things to Know

• Quality: Rated 4.6/5 from 62 reviews. Users report good durability for residential use, but some note it may wear faster than OEM under heavy commercial use.
• Installation: Moderate difficulty. You’ll need to remove the deck or at least the belt guard and tensioner pulley. A belt diagram is essential—take a photo before removing the old one.
• Common gotcha: The belt may appear slightly tight or loose on first install. Run the deck for 2-3 minutes at low speed, then recheck tension. If it squeals or slips, adjust the tensioner.
• Warranty/cost: At $27.88, it’s about half the price of OEM. No extended warranty—treat it as a budget replacement.

Should You Buy It

Buy this if you have a Cub Cadet RZT or Ultima 50-inch deck, need a quick, affordable replacement for residential mowing, and are comfortable with moderate DIY installation. Skip it if you’re a commercial operator, want a belt with a longer warranty, or need an exact OEM match—stick with the Cub Cadet branded belt instead.