Husqvarna 501080401 Drive Belt for All Wheel Drive Mowers. 21-in

What It Is

This is the OEM drive belt (part #501080401) that transfers power from the engine pulley to the transmission on Husqvarna all-wheel-drive mowers with a 21-inch cutting deck. It’s designed specifically for models where both rear wheels are powered to improve traction on slopes or thick grass.

Fitment & Compatibility

Before buying, confirm your mower model number—this belt fits Husqvarna AWD models like the HU800AWD, HU900AWD, and several LC series (e.g., LC 221A, LC 321A). It is not for standard two-wheel-drive Husqvarna push mowers. Measure your old belt length (should be ~95.2 inches) and check the belt routing diagram under the deck or in your manual—incorrect routing will cause slipping or premature wear. This is an OEM part, so it matches original specs; aftermarket alternatives may vary in thickness or width.

Key Things to Know

• Quality: OEM construction with reinforced rubber—holds up well under heavy use, but expect replacement every 1–2 seasons if mowing rough terrain.
• Installation: Moderate difficulty. You’ll need to remove the blade, deck pulley, and tensioner spring. A belt tool helps, but a flathead screwdriver works. Allow 30–45 minutes.
• Common gotcha: The belt can appear identical to the 2WD version but is slightly wider. Using the wrong belt will cause poor AWD engagement or belt squeal.
• Check tensioner: While replacing, inspect the idler pulley and spring for wear—a seized pulley will shred a new belt quickly.

Should You Buy It

If you own a Husqvarna 21-inch AWD mower and need a reliable, direct-fit replacement, this belt is a solid choice for the price. It’s a good value for DIY maintenance—just be sure to double-check your model number and routing before ordering.