405143 MOWER DECK BELT replacement for CRAFTSMAN 46" 532405143 584453101 & fits POULAN

What It Is

This is a replacement mower deck belt (OEM number 405143) designed to drive the blades on 46-inch cutting decks used by Craftsman and Poulan lawn tractors. It’s a standard V-belt for residential mowers, not for zero-turn or commercial machines.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: This belt fits only 46-inch decks. Measure your deck width or check your mower’s model number.
• OEM cross-reference: It replaces Craftsman 532405143 and 584453101. If your original belt has either number, it’s a direct match.
• Physical dimensions: The belt is roughly 1/2-inch wide and 96.5 inches long. Measure your old belt’s length (lay it flat, measure end to end) to be sure – aftermarket belts can vary slightly.
• Brand fit: Works on most Craftsman and Poulan lawn tractors with a 46-inch deck and a two-belt system (this is the primary deck belt, not the drive belt). Check your owner’s manual for the belt routing diagram.

If your mower uses a different deck size (e.g., 42-inch or 54-inch), this belt will not fit.

Key Things to Know

• Quality: Aftermarket, not OEM. Expect similar durability to a factory belt if installed correctly – typically 2–3 seasons with normal use.
• Installation difficulty: Moderate. You’ll need to remove the deck or at least the belt guard, then route the belt around pulleys and tensioner. A diagram helps – take a photo before removing the old belt.
• Common gotcha: The belt can slip if the tensioner spring is weak or the pulleys are worn. If your old belt was frayed or glazed, inspect pulleys for damage before installing the new one.
• Length variance: Some users report this belt is slightly tighter or looser than OEM. If your deck has an adjustable tensioner, you can compensate; if not, it may require re-routing.

Should You Buy It

If you need a reliable, budget-friendly replacement for a worn deck belt on a 46-inch Craftsman or Poulan tractor, this is a solid pick. It won’t outperform a premium OEM belt, but for typical residential mowing, it’s more than adequate. Just double-check your deck size and belt length before ordering.