Replacement Idler Pulley 532127783 for HU Mower - V Groove Idler Pulley 139245 Compatible with Craftsman, Pou LAN, AYP Riding Mower, Replaces 127783 532139245 532106298 280-770, 2 Pack

What It Is

This is a replacement V-groove idler pulley (part number 532127783) designed for the belt tensioning system on Husqvarna, Craftsman, Poulan, and AYP riding mowers. It keeps the deck drive belt properly tensioned so the blades engage and spin consistently.

Fitment & Compatibility

Before buying, confirm these three things:

• Measure the pulley: Outer diameter should be 3.5 inches, with a 5/8-inch bore and a 3/8-inch V-groove. If your old pulley is different, this won’t fit.
• Check OEM numbers: This replaces 532127783, 532139245, 532106298, and 280-770. Also fits where 139245 is listed.
• Verify deck size and model: Works on most 42-inch to 54-inch decks on Craftsman LT/GT, Poulan Pro, and AYP mowers from the 2000s onward. Look up your mower’s model number (starts with 917 or 960) to cross-reference.

Key Things to Know

• Quality: Metal pulley with a sealed ball bearing. Holds up well under normal use, but avoid overtightening the belt – it can wear the bearing faster.
• Installation: Easy if you have a socket and wrench. Remove the old pulley bolt, swap the pulley, and re-torque to 15-20 ft-lbs. No special tools needed.
• Common gotcha: The belt groove is V-shaped, not flat. If your deck uses a flat idler pulley, this won’t work. Also, check that the belt isn’t already damaged – a worn belt can ruin a new pulley quickly.
• Two-pack value: You get two pulleys for the price of one OEM. Keep the spare for future replacement.

Should You Buy It

If your Craftsman, Poulan, or AYP riding mower is getting belt slip, squealing, or uneven cutting from a worn idler pulley, this is a reliable, affordable fix. It matches OEM specs, installs in under 15 minutes, and the two-pack gives you a backup. Skip it if your pulley has a different bore size or groove shape – measure first.