5/8 x 148 1/4 Inch Lawn Mower Deck Belt 954-04329 Made with Kevlar for MTD Cub Cadet Troy Bilt Mower with 54" Deck RZT- L54 S54 LX54 ZT1-54 ZT-S54 Z6900 Z6600 Z560 Mustang XP 54, 954-04329A 754-04329

What It Is

This is a 5/8-inch wide, 148 1/4-inch long Kevlar-reinforced deck belt designed for 54-inch zero-turn mowers from MTD, Cub Cadet, and Troy-Bilt. It drives the blades on models like the RZT L54, S54, LX54, ZT1-54, ZT-S54, Z6900, Z6600, Z560, and Mustang XP 54.

Fitment & Compatibility

Before buying, confirm your mower has a 54-inch deck and uses a belt measuring 5/8" wide x 148 1/4" long. Cross-check the OEM part number: 954-04329 (also supersedes 954-04329A and 754-04329). This belt fits Cub Cadet RZT, ZT1, ZT-S, and Z6000-series zero-turns, plus Troy-Bilt Mustang XP 54 models. For a quick check, measure your old belt’s length end-to-end (not around pulleys) and width across the flat side. Avoid assuming “fits all 54-inch decks” — some use different lengths.

Key Things to Know

• Kevlar construction adds durability and heat resistance, reducing stretch and early failure compared to standard rubber belts. Expect longer life under heavy mowing.
• Installation difficulty is moderate — you’ll need to remove the deck or release the tensioner pulley. A belt routing diagram is often printed on the deck or in the manual; take a photo before removing the old belt.
• Common gotcha: The belt must sit correctly in all pulley grooves, especially the idler and spindle pulleys. A misrouted belt can cause slipping, noise, or rapid wear. Double-check tension after installation — too loose and it slips, too tight and it strains bearings.
• Price point (~$25) is competitive for a Kevlar belt; cheaper alternatives may lack reinforcement and wear out faster on zero-turn decks.

Should You Buy It

If you own a compatible 54-inch MTD/Cub Cadet/Troy-Bilt zero-turn and want a reliable, long-lasting deck belt, this Kevlar option is a solid upgrade over basic belts. The 5.0 rating backs its performance, but verify your exact model number first — it’s worth the extra minute to avoid a return.