8TEN Deck Belt for MTD Cub Cadet Troy Bilt XT1-LT42 XT2-LX42 T8000 CYT4220 CYT4220SE 754-05021 954-05021

What It Is

This is a replacement deck belt for 42-inch cutting decks on select MTD-built lawn tractors, including Cub Cadet XT1 and XT2 series, Troy-Bilt, and certain Craftsman models. It drives the blades from the engine pulley.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck and is from the MTD family (Cub Cadet, Troy-Bilt, Yard-Man, etc.). The belt replaces OEM part numbers 754-05021 and 954-05021. Measure your old belt end-to-end (flat, not twisted) to verify it matches 1/2-inch width x 92.5-inch length. This is an aftermarket belt, so it should fit models like XT1-LT42, XT2-LX42, T8000, CYT4220, and CYT4220SE. Check your owner’s manual or deck underside for the original part number to be certain.

Key Things to Know

• Quality vs OEM: At ~$20, this is a budget-friendly alternative to the Cub Cadet OEM belt (~$30-40). It’s made by 8TEN, a known aftermarket brand, but some users report slightly shorter lifespan than OEM.
• Installation: Moderate difficulty—you’ll need to remove the deck or at least the belt guard. Use a diagram (available online) to route the belt correctly around all pulleys and idlers. A belt tension tool helps, but a socket wrench works.
• Common gotcha: The belt may feel tight initially; run the mower for a few minutes, then re-check tension. Loose belts slip, tight belts can damage pulleys. Also, verify your deck spindles spin freely before installing—a seized spindle will shred any belt.
• Fitment note: Double-check your deck’s belt routing—some 42-inch MTD decks use a different belt length (e.g., 93.5 inches). Measure twice.

Should You Buy It

If you have a confirmed-compatible MTD 42-inch deck and want a cost-effective replacement that works out of the box, this is a solid choice. It’s not built to outlast OEM, but for seasonal use or as a backup, the price is right. If you mow heavy grass weekly and want maximum durability, stick with the Cub Cadet genuine belt.