405143 532405143 Kevlar Mower Deck Belt for Craftsman Husqvarna YTH22V46 YTH20K46 46 Inch Lawn Mower, Replaces Poulan AYP 584453101 21546607, 1/2" x 105.75"

What It Is

This is a 46-inch deck drive belt (1/2" x 105.75") made with Kevlar-reinforced cord for increased durability under load. It connects the engine pulley to the mower deck spindles on specific Craftsman and Husqvarna lawn tractors with 46-inch cutting decks.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: Must be exactly 46 inches. This belt will not work on 42" or 54" decks.
• Model number: Confirmed fit for Craftsman YTH22V46 and YTH20K46, plus Husqvarna YTH22V46 and YTH20K46. Also fits many Poulan and AYP tractors with 46" decks.
• Measurements: 1/2" wide x 105.75" outside length. Measure your old belt (lay it flat, measure end-to-end) to confirm match.

OEM cross-references: Replaces Craftsman 405143, 532405143, Poulan 584453101, and AYP 21546607. If your original belt has a different number, measure first.

Not universal: This is a deck drive belt, not a drive or transmission belt. It only works on tractors with a manual or electric PTO deck engagement system.

Key Things to Know

• Kevlar vs. standard: Kevlar reinforcement resists stretching and heat better than standard rubber belts, especially under heavy grass or wet conditions. Expect longer life if you mow frequently.
• Installation difficulty: Moderate. You’ll need to remove the deck or at least the belt guard, then route the belt around pulleys and idlers. A belt routing diagram (usually on deck top or in manual) is essential—take a photo before removing old belt.
• Common gotchas:
  • The belt is directional—check for an arrow on the belt indicating rotation direction. Installing backward can cause premature wear or squealing.
  • If the old belt was stretched or frayed, inspect idler pulleys and spindles for damage (seized bearings, rough edges) before installing the new belt.
  • This belt is slightly longer than some aftermarket “universal” options—stick to this exact length for proper tension and deck engagement.

Should You Buy It

If you own a Craftsman or Husqvarna 46-inch lawn tractor (YTH22V46 or YTH20K46) and need a deck drive belt that won’t stretch out in a season, yes. The Kevlar reinforcement is a genuine upgrade over standard belts at a similar price. Skip it if your deck is a different size or you need a drive/transmission belt—this is deck-specific only.