2 Pack 587973001 Idler Pulley with 587969201 Idler Pulley Replaces 581904001 580364301 for LC221A L221A L321AH HU675AWD HU700AWD HU725AWDE HU775AWD HU800AWDH LC356AWD Lawn Mowers

What It Is

This is a 2-pack idler pulley set (part numbers 587973001 and 587969201) that replaces OEM numbers 581904001 and 580364301. It’s designed for the blade drive belt system on Husqvarna and AYP zero-turn mowers and lawn tractors, primarily models with 46-54" decks.

Fitment & Compatibility

• Fit these models precisely: LC221A, L221A, L321AH, HU675AWD, HU700AWD, HU725AWDE, HU775AWD, HU800AWDH, LC356AWD. Confirm your deck size and model number on the mower’s sticker (under seat or on frame).
• Not universal: Will not fit most standard riding mowers or push mowers—only the specific Husqvarna AWD and LC series listed.
• Measure before buying: OEM pulley outer diameter is 4.0" (587973001) and 3.5" (587969201). Verify your old pulley OD matches; aftermarket diameters can vary slightly and cause belt slip.
• Bearing type: Both are sealed ball bearings. Check that the inner bore size is 1/2" (common for this series).

Key Things to Know

• Quality: Aftermarket, but rated 4.6/5 from 2,105 reviews. Many users report it matches OEM performance for a fraction of the cost.
• Installation difficulty: Moderate. Requires removing the deck, belt, and retaining bolt. A socket wrench and pry bar help. Expect 20-40 minutes.
• Common gotcha: The pulley nut is often tight and may be thread-locked. Use penetrating oil and a breaker bar. Don’t overtighten on reinstall—torque to 20-25 ft-lbs.
• Belt check: While replacing pulleys, inspect the drive belt for cracks or wear. A worn belt will kill new pulleys fast.

Should You Buy It

Buy this if you own one of the listed Husqvarna AWD or LC models and need a cost-effective replacement for a noisy or seized idler pulley. It’s a solid value for DIYers comfortable with deck removal. Skip it if you need OEM exact match for warranty purposes or if your pulley size differs from 4.0"/3.5".