954-05078 Mower Deck Belt 5/8" X 143 1/4" Replacement for Cub Cadet MTD Troy-Bilt 754-05078 Husqvarna 574845603 Exmark 1-413308 Ultima Series ZT1-50 ZT1-50 KW ZT2-50 KW and ZT1-50

What It Is

This is a 5/8-inch wide, 143 1/4-inch long V-belt that drives the mower blades on select zero-turn mowers. It’s designed for Cub Cadet, MTD, Troy-Bilt, Husqvarna, and Exmark models, primarily those with 50-inch decks in the Ultima Series (ZT1-50, ZT1-50 KW, ZT2-50 KW).

Fitment & Compatibility

Before buying, verify three things:

• Deck size: Only for 50-inch decks. Won’t fit 42, 46, 54, or 60-inch decks.
• Original part number: Cross-references to OEM numbers 754-05078, 574845603, and 1-413308. Check your mower’s manual or old belt for the exact number.
• Belt dimensions: 5/8" width x 143 1/4" length. Measure your old belt if possible—some aftermarket belts vary slightly in length, which can cause slipping or poor engagement.
• Brand match: Fits Cub Cadet ZT1-50, ZT1-50 KW, ZT2-50 KW; also compatible with select Husqvarna and Exmark models listed in the title. Not universal—double-check your model number.

Key Things to Know

• Quality: Rated 4.6/5 stars (66 reviews). Users report it holds up well under normal residential use, but heavy commercial mowing may require a premium OEM belt.
• Installation difficulty: Moderate. You’ll need to release deck tension, route the belt around spindle and idler pulleys, and re-tension. A diagram helps—take a photo before removal.
• Common gotcha: This belt is notched (cogged) for flexibility. If your original is smooth, this may still work, but check that the pulleys are notched-compatible to avoid premature wear.
• Price point: $29.99 is typical for a quality aftermarket belt. OEM belts may cost $10–15 more but offer identical fit.

Should You Buy It

Buy this if you own a Cub Cadet, MTD, or Troy-Bilt zero-turn with a 50-inch deck and need a reliable, affordable replacement for residential mowing. It’s a solid value with good reviews, but if you mow commercially or want zero risk of sizing issues, stick with the exact OEM part number.