AM115460 Idler Pulley Fits John Deere GT275 LX255 LX266 LX277 LX280 S2048 S2348

What It Is

The AM115460 idler pulley is a replacement tension pulley for the mower deck belt on select John Deere lawn tractors. It guides and tensions the belt to keep the blades engaged and spinning properly.

Fitment & Compatibility

• Direct fit for: John Deere GT275, LX255, LX266, LX277, LX280, S2048, S2348 (all with 48-inch or 54-inch decks that use this specific pulley).
• OEM cross-reference: Replaces OEM part AM115460. Aftermarket version is functionally identical in dimensions and bearing quality.
• Critical check: Measure your existing pulley’s outside diameter (typically 4 inches) and shaft bore size (usually 5/8 inch). If yours differs, this pulley won’t fit.
• Deck model matters: Only compatible with decks that use a single idler pulley on the belt path—not dual-pulley setups. Verify your deck’s belt routing diagram before ordering.

Key Things to Know

• Bearing quality: This aftermarket pulley uses a sealed ball bearing. It’s durable but not as robust as OEM in heavy commercial use—fine for residential mowing.
• Installation difficulty: Easy. You’ll need a socket set and possibly a breaker bar for the bolt. No special tools required. Takes about 15 minutes.
• Common gotcha: The tension bolt can be seized from rust. Apply penetrating oil (e.g., WD-40) an hour before removal. If the bolt snaps, you’ll need to drill it out.
• Belt check: Always inspect the deck belt for wear when replacing the pulley. A worn belt can damage a new pulley quickly.

Should You Buy It

This is a solid, budget-friendly replacement for homeowners with a John Deere LX or GT series tractor who need to fix a squealing or slipping deck belt. It’s not for commercial landscapers—those should stick with OEM for longer life. If your pulley is wobbling or the bearing is rough, this will restore proper blade engagement and quiet operation for under $25.