405143 532405143 Mower Deck Belt for Husqvarna Craftsman 46 Inch Deck YTH22V46 YTH20K46 YTH21K46, Kevlar Cord, 1/2" x 105.75", Replaces 584453101 21546607 7133156

What It Is

This is a replacement deck drive belt for 46-inch cutting decks on select Husqvarna and Craftsman lawn tractors. It transfers power from the engine pulley to the spindle blades, and its Kevlar cord construction is designed for higher durability than standard rubber belts.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: This belt fits only 46-inch decks (not 42-inch or 54-inch). Measure your deck width or check the model number.
• Machine models: It directly replaces Husqvarna YTH22V46, YTH20K46, YTH21K46, and Craftsman equivalents with a 46-inch deck. Also fits some Poulan, McCulloch, and AYP models using the same P/N.
• Measurements: Exact specs are 1/2-inch wide and 105.75 inches long. If your old belt measures differently (e.g., 106 inches), it will not track correctly. OEM cross-references include 584453101, 21546607, and 7133156.

Key Things to Know

• Kevlar cord is a real upgrade: This belt resists stretching and snapping better than standard belts under heavy mowing or debris loads. It’s a good choice if you mow thick, damp grass or have a rough lawn.
• Installation is moderate: You’ll need to remove the deck or at least the belt shield. Route it exactly per the diagram (usually around the engine pulley, two spindle pulleys, and an idler). A belt tensioner tool or socket can help.
• Watch for belt length variation: Aftermarket belts sometimes run slightly shorter or longer than OEM. If you get a “tight” fit, double-check routing before forcing it—wrong routing causes premature wear.
• Check pulleys and spindles: A worn or wobbly pulley will shred any belt quickly. Spin each spindle by hand; replace any that are noisy or have play.

Should You Buy It

If you own a Husqvarna or Craftsman 46-inch lawn tractor and want a durable, budget-friendly belt that outlasts standard rubber, this is a solid choice. It’s especially worth it for heavy-use yards where belt snapping is a recurring headache. Avoid it if you need a different deck size or an exact OEM-length belt for a non-standard model.