2 Pack GX20367 Pulley Replaces UC23728 Pulley for John Deere 42 Inch D110 D130 D105 D125 D100 L100 L110 L111 L118 LA115 LA105 LA135 LA100 LA120 LA125 E100 S100 E130 E110 Lawn Tractors

What It Is

This 2-pack of GX20367 pulleys is a direct replacement for the OEM UC23728 idler pulley found on 42-inch cutting decks of many John Deere lawn tractors. It guides and tensions the deck belt to keep the blades engaged smoothly during mowing.

Fitment & Compatibility

Before buying, verify your tractor’s deck size (must be 42-inch) and model. It fits D100, D105, D110, D130, D125, L100, L110, L111, L118, LA100, LA105, LA110, LA115, LA120, LA125, LA135, E100, E110, E120, E130, and S100 series. Cross-reference your old pulley’s part number—this replaces John Deere OEM UC23728 and GX20367. Measure the pulley diameter (4 inches) and shaft hole (5/8 inch) to confirm. Aftermarket part; not OEM, but matches specs.

Key Things to Know

• Quality note: Most users report good durability, but a few note bearing noise after a season. Inspect for smooth spin before install.
• Installation: Moderate difficulty—requires removing the deck and belt, then swapping the pulley with a wrench. No special tools needed.
• Common gotcha: The belt may need re-tensioning after pulley replacement. Check belt condition; replace if worn.
• Pack value: Two pulleys for the price of one OEM unit—handy spare or replace both idlers at once.

Should You Buy It

If you own one of the listed John Deere models with a 42-inch deck and need an affordable, direct-fit replacement for a worn or noisy idler pulley, this 2-pack is a solid value. It’s best for DIY homeowners who want a quick fix without paying OEM prices, but expect standard aftermarket longevity.