8TEN Drive Belt for MTD Cub Cadet RZT 42 50 RZT50 RZT42 RZT17 754-04043 954-04043

What It Is

This is a replacement drive belt for MTD and Cub Cadet RZT zero-turn mowers, specifically designed to transfer power from the engine to the transmission. It’s intended for mowers with 42-inch or 50-inch decks in the RZT series.

Fitment & Compatibility

Before buying, verify your mower model and deck size. This belt fits:

• Cub Cadet RZT 42, RZT 50, RZT17 (and some RZT 54/60 models, but check your manual)
• MTD models using OEM part numbers 754-04043 or 954-04043
• Aftermarket replacement for OEM Cub Cadet/MTD belts

Critical checks:

• Measure your old belt length (center-to-center of pulleys) – this belt is typically 1/2" x 92.5" (some variations exist)
• Check your deck size: 42" and 50" decks are confirmed; larger decks may need a different belt
• Confirm your mower’s model number (e.g., RZT42, RZT50) on the frame or under seat – not just the deck size
• Not compatible with RZT 60 or RZT 54 without verifying length

Key Things to Know

• Quality: Aftermarket belt, not OEM. Users report it’s slightly thinner than OEM, which can cause slipping under heavy load or on hills.
• Installation difficulty: Moderate. You’ll need to remove the deck or belt guard, and a spring-loaded tensioner may require a wrench to release tension. Expect 30-60 minutes.
• Common gotcha: Belt may be too long or too short for some RZT 54/60 models – always measure before buying. Also, check pulley condition; worn pulleys can shred a new belt quickly.
• Lifespan: Mixed reviews – some get 1-2 seasons, others report failure in weeks if used on rough terrain or with aggressive mowing.

Should You Buy It

If you own a Cub Cadet RZT 42 or 50 and need a budget-friendly replacement, this belt works for light to moderate use. But if you mow thick grass, steep slopes, or want maximum durability, spend more on an OEM belt to avoid premature slipping or breakage.