GX20006 GX20286 GX20287 Transmission Drive Belt and Idler Pulley Repair Kit Compatible with John Deere L100 LA100 S100 X100 D100 Series Mower Replaces UC30568 265-186 1760097 690409 690409MA

What It Is

This is a combined transmission drive belt and idler pulley repair kit designed to restore power transfer from the engine to the rear wheels on select John Deere lawn tractors. It’s meant for machines with a 42-inch deck and a Tuff Torq K46 transaxle.

Fitment & Compatibility

Before buying, confirm your mower is one of these John Deere series: L100, LA100, S100, X100, or D100 (including models like L107, L120, D105, D110, D125, D130, D140, D150, D155, D160, D170, LA105, LA115, LA125, LA135, LA145, LA155, LA165, S120, S140, S160, S180, X105R, X110, X115R, X120, X140, X145R, X155, X165R, X175R, X185R). Also fits some 100-series with 42-inch decks. Check your owner’s manual or current belt part numbers: UC30568, 265-186, 1760097, 690409, or 690409MA. Measure your old belt length—this kit uses a 92.8-inch belt. Verify the idler pulley diameter matches your original (typically 3.5 inches). Not compatible with 48-inch or larger decks.

Key Things to Know

• Quality: The belt is aramid-reinforced for durability, but the pulley is stamped steel, not cast iron—it may wear faster under heavy use.
• Installation: Moderate difficulty. You’ll need to remove the mower deck and release tension from the belt guide. A 1/2-inch socket and pry bar help. Takes 30–60 minutes.
• Common Gotcha: The belt routing diagram in the box can be unclear. Take a photo of the old belt path before removing it. Some users report the belt runs slightly tight—double-check the tensioner spring is correctly seated.
• Includes: One drive belt and one idler pulley with bearing. You may need to reuse your original hardware (bolt and spacer).

Should You Buy It

Buy this kit if you have a 42-inch deck John Deere in the listed series and your transmission belt is slipping, frayed, or broken, and the idler pulley wobbles or squeaks. It’s a budget-friendly fix for a common wear item, but if you mow heavy wet grass or large lawns, consider upgrading to an OEM belt for longer life.