580364604 532406557 Drive Belt for Husqvarna HU775BBC HU775H HU775HW Lawn Mowers

What It Is

This is a genuine OEM drive belt (part #580364604 / 532406557) that transfers power from the engine pulley to the transmission on select Husqvarna walk-behind mowers. It’s a critical wear item—when it stretches, frays, or snaps, the mower won’t self-propel.

Fitment & Compatibility

Before buying, confirm your mower model: this belt fits Husqvarna HU775BBC, HU775H, and HU775HW models. It does not fit other HU775 variants (e.g., HU775A or HU775AW) or any non-Husqvarna brand. The belt is 1/2” wide by 87” long (OEM spec). Measure your old belt’s length and width if possible—aftermarket replacements sometimes vary slightly. Also check your deck size: these models use a 21” steel deck; if your mower has a different deck, this belt likely won’t route correctly.

Key Things to Do

• Check pulley condition – Worn or bent pulleys will shred a new belt quickly. Spin them by hand; replace if rough or wobbly.
• Installation is moderate – You’ll need to remove the blade, belt cover, and tensioner spring. A spring puller tool helps.
• Tension matters – After installing, ensure the belt sits snugly in all pulley grooves. Too loose = slippage; too tight = premature wear.
• OEM vs aftermarket – This genuine Husqvarna belt is priced close to aftermarket but often lasts longer due to better rubber compound and exact sizing. Avoid no-name belts under $6.

Should You Buy It

If you own a HU775BBC, HU775H, or HU775HW and your self-propel is failing, this belt is the correct OEM fix. It’s affordable, reliable, and avoids fitment headaches. Skip it only if you’re certain you need a different model or want to gamble on a cheaper aftermarket belt.