Husqvarna Walk Behind Lawn Mower Drive Belt / HU675, HU725, HU775, HU800 / 580364610, 580364603, 580364602, 580364601

What It Is

This is the original-equipment drive belt for Husqvarna walk-behind mowers with 675, 725, 775, and 800 series engines. It transfers power from the engine pulley to the transmission, enabling forward motion.

Fitment & Compatibility

Before buying, confirm your mower’s model number matches one of these: HU675, HU725, HU775, or HU800. The belt is available under OEM part numbers 580364610, 580364603, 580364602, or 580364601 – any of these will work. Measure your old belt’s length (typically 93-95 inches) and width (about 1/2 inch). This belt fits 42-inch and 48-inch deck sizes common on these Husqvarna walk-behinds. It is not compatible with rider mowers, zero-turns, or other brands without cross-referencing.

Key Things to Buy

• Quality is OEM Husqvarna – same as the belt that came with the mower, so fit and durability are guaranteed. Aftermarket belts may be cheaper but often wear faster or slip.
• Installation is moderate difficulty – you’ll need to remove the deck belt guard, release tension from the idler pulley, and route the belt around the pulleys. A belt routing diagram is usually printed under the mower deck.
• Common gotcha: the belt can be tight to install. Use a wrench to pivot the idler pulley and slip the belt over the engine pulley last. Never pry or stretch the belt with tools – it can damage the cord.
• Check the idler pulley and tensioner spring for wear while you’re in there. A worn pulley or weak spring will cause premature belt failure.

Should You Buy It

If you own a Husqvarna HU675, HU725, HU775, or HU800 walk-behind mower and need a direct, no-guesswork replacement, this belt is the right choice. It’s priced fairly for OEM quality and has strong user feedback. Avoid it if you’re looking for a cheaper aftermarket option or if your mower model isn’t listed.