Husqvarna 21" Drive RWD Deck Belt 580364608 — OEM 21-inch replacement for LC221R/LC221RH, factory-fit durability

Genuine Husqvarna 21" rear-wheel-drive (RWD) deck belt 580364608 replaces worn belts on compatible lawn mowers to restore proper deck and drive operation.

If your Husqvarna LC221R or LC221RH mower is slipping, making unusual noises, or not engaging the deck properly, a worn drive belt is often the cause. This 21-inch, factory-original RWD belt is manufactured to Husqvarna specifications for fit and durability and comes as a single replacement unit. It’s intended to match the tension, profile, and material characteristics of the original equipment so installation and function are straightforward when the correct part number is used.

How do I know this belt fits my mower?

Confirm compatibility by checking your mower’s parts diagram or owner’s manual for Husqvarna part number 580364608, or for the LC221R / LC221RH model listings. While this belt is designed for those models, some other brands or model variants may use the same size and profile; always verify the specific part number before ordering.

• Fits Husqvarna models: LC221R, LC221RH
• Exact Husqvarna part number: 580364608
• Measure belt length and profile against the old belt if uncertain
• Refer to OEM parts diagram for correct routing and placement

What are the key attributes of this OEM drive belt?

This is an original-equipment 21-inch deck/drive belt built to Husqvarna’s standards for material and construction. It is supplied as a single unit and packed to prevent deformation during shipping. Seasonal replacement is recommended to maintain reliable mower operation.

• Length: 21 inches (designed for RWD application)
• OEM manufacturer part: Husqvarna 580364608
• Sold as one replacement belt per package
• Shipped in protective packaging sized 16" x 10.5" x 4"

How do I replace the drive belt and what tools do I need?

Replacing a deck/drive belt is a routine maintenance task for most homeowners familiar with small-engined equipment. Basic hand tools and safe lifting or support for the mower deck are needed; follow the mower’s service manual for correct belt routing and tensioning steps to avoid damage.

• Typical tools: socket set, screwdrivers, pliers, and a work stand or wheel chocks
• Follow OEM belt routing diagrams to ensure correct installation
• Inspect pulleys and idlers for wear when replacing the belt
• Wear gloves and disconnect spark plug before beginning work

When should I replace this belt?

Replace the belt if you notice visible cracking, glazing, fraying, loss of grip, or if the deck fails to engage properly. Regular inspection at the start of each mowing season and after heavy use helps prevent breakdowns and keeps cutting performance consistent.

• Inspect belts seasonally and after heavy mowing or debris impact
• Replace if edges are shredded or teeth are worn down
• Swap the belt if the mower exhibits slipping, squealing, or poor deck engagement
• Check idler pulleys and spindle bearings when changing the belt

Who is this for: This authentic Husqvarna 21" RWD drive belt is intended for owners of Husqvarna LC221R and LC221RH lawn mowers, professional service technicians, and DIYers who prefer OEM parts for fit and function. If you want a direct factory replacement to maintain original performance characteristics and easy fitment—rather than a generic aftermarket belt—this part provides the correct size and specification. Always verify the Husqvarna part number in your mower’s manual or parts list before purchasing to ensure proper fitment.