GX20286 V Idler Pulley with GX20287 Flat Idler Pulley UC30568 Belt and Hardware Kit Replaces AUC20392 AUC20393 for John Deere D105 D140 D155 L100 L111 L118 L120 L130 La145 Lawn Decks

What It Is

This kit combines a V idler pulley (GX20286), a flat idler pulley (GX20287), a drive belt (UC30568), and all necessary hardware to replace the OEM pulley and belt assembly on stamped-steel John Deere lawn tractor decks. It’s designed for decks that use two idler pulleys and a single belt to drive the blades.

Fitment & Compatibility

Before buying, confirm your mower deck model and size. This kit fits John Deere D105, D140, D155, L100, L111, L118, L120, L130, and LA145 models with 42-inch or 48-inch stamped decks (not fabricated decks). The belt is 92.5 inches long, 1/2 inch wide (A-section). Measure your existing belt length and pulley shaft diameter (typically 5/8 inch). Cross-reference OEM part numbers AUC20392 (pulley set), AUC20393 (belt), and verify your deck’s idler arm design—some earlier L-series decks use a different bearing setup.

Key Things to Know

• Quality: Aftermarket pulleys use sealed bearings and stamped steel; they work fine for residential mowing but may wear faster than OEM under heavy use or wet grass.
• Installation: Moderate difficulty—requires removing the deck, loosening belt tension, and swapping pulleys. Use a socket and wrench; no special tools needed.
• Common gotcha: The flat idler pulley (GX20287) must be installed with the flat side facing the belt—reversing it will cause belt slip and rapid wear.
• Hardware included: Bolts, washers, and lock nuts; reuse your original idler arm if it’s not damaged.

Should You Buy It

If you need a complete pulley-and-belt refresh for a common John Deere stamped deck and want to save roughly 30–40% over OEM pricing, this kit is a solid choice. It’s best for DIY homeowners who can handle basic deck removal and belt routing. Avoid if you have a fabricated (heavy-duty) deck or need commercial-grade longevity.