Parts Shop Deck Drive Belt 46" for AYP Poulan Husqvarna Craftsman 405143 532405143 21546607 584453101 YTH21K46 YTH22V46 YTH20K46 YTA22V46 Aramid Cord / 105.50 inches

What It Is

This is a 105.50-inch deck drive belt for 46-inch cutting decks, designed to transfer power from the engine pulley to the blade spindles on select AYP (American Yard Products) mowers. It’s a direct replacement for OEM part numbers 405143, 532405143, 21546607, and 584453101, and fits popular Husqvarna, Poulan, and Craftsman models like the YTH21K46, YTH22V46, YTH20K46, and YTA22V46.

Fitment & Compatibility

Before buying, measure your old belt length (end-to-end, not looped) to confirm 105.50 inches. This belt only fits 46-inch decks—not 42-inch or 54-inch. Check your mower’s model number (stamped under the seat or on the frame) against the listed compatible models. If your machine uses a different OEM belt number (e.g., 532 40 51-43), this is the same part. For non-AYP brands (MTD, John Deere), verify pulley spacing and belt routing—this belt is specific to AYP spindle layouts.

Key Things to Know

• Aramid cord construction adds durability vs. standard rubber belts, but it’s stiffer initially—expect a break-in period of 1-2 mowings before it fully seats.
• Installation is moderate difficulty: you’ll need to remove the deck, loosen the idler pulley, and thread the belt around three spindles and the tensioner. No special tools required, but a second set of hands helps.
• Common gotcha: The belt can slip if the idler spring is worn or the pulley bearings are dry. Inspect both before installing.
• Price vs. OEM: At ~$13, it’s roughly half the cost of a dealer belt, but may not last as long under heavy use (e.g., thick, wet grass).

Should You Buy It

Buy this if you have a compatible 46-inch AYP mower and want a solid, budget-friendly replacement for occasional to moderate use. It’s a good value for DIYers who can handle the install, but skip it if you mow commercially or need maximum longevity—then spring for an OEM belt.