405143 Deck Drive Belt for 46" AYP/Poulan/Husqvarna/Craftsman, Replaces 405143/532405143/ 21546607/584453101

What It Is

This is a 46-inch mower deck drive belt (part number 405143) that transfers power from the engine pulley to the blade spindles, enabling the blades to spin for cutting grass. It’s designed for riding mowers and lawn tractors with a 46-inch deck, typically from AYP (American Yard Products), Poulan, Husqvarna, or Craftsman.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: This belt is specifically for 46-inch cutting decks. Measure your deck width if unsure—it won’t fit 42-inch or 54-inch decks.
• Model/brand: Confirmed replacement for Craftsman (917 series), Husqvarna (YTH, GTH, LTH series), Poulan (PP, PB series), and AYP-built tractors. Check your owner’s manual or look up your model number online.
• OEM vs aftermarket: This is an aftermarket belt that replaces OEM part numbers 405143, 532405143, 21546607, and 584453101. Measure the original belt’s length (roughly 96.5 inches) and width (1/2 inch) to confirm match. Deck pulley arrangement (3- or 4-spindle) must also match your tractor—most 46-inch decks use a 3-spindle setup.

Key Things to Know

• Quality: Aftermarket belts can vary. This one typically holds up well for residential use (seasonal mowing), but may wear faster than OEM on heavy-duty or commercial jobs.
• Installation difficulty: Moderate—requires removing the deck or working underneath. You’ll need to route the belt around pulleys and idler arms. Refer to a deck diagram for your specific model.
• Common gotcha: Belt tension is critical. If the belt is too loose, blades won’t engage; too tight can damage pulleys. Check the idler spring tension and adjust per your manual.
• Check pulleys: A worn or seized pulley will shred a new belt quickly. Spin each pulley by hand—replace any that wobble or feel rough.

Should You Buy It

This belt is a solid, affordable choice for homeowners with a 46-inch AYP/Poulan/Husqvarna/Craftsman tractor who need a reliable replacement for light to medium mowing. It’s not ideal for heavy commercial use or if you want a premium, longer-lasting belt. If you’re handy and confirm fitment first, it’s a good value.