GX20286 and GX20287 Idler Pulleys, GX20006 Belt Replaces GX20287 Idler Pulley John Deere GX20286 690409 AUC20393 UC30568 for D110 D130 D140 D155 D170 L111 L120 L130 LA115 LA130 LA145 Tractors

What It Is

This is a replacement idler pulley set (GX20286 and GX20287) plus a drive belt (GX20006) for select John Deere lawn tractors. The pulleys guide and tension the mower deck belt; the belt drives the blades. Designed for 42” and 48” decks on D100, D100-series, L100, and L100-series tractors.

Fitment & Compatibility

Before buying, verify:

• Deck size: Works with 42” and 48” stamped-steel decks only. Does not fit 54” or fabricated decks.
• Model fit: Confirmed for D110, D130, D140, D155, D170, L111, L120, L130, LA115, LA130, LA145. Check your model’s OEM pulley part numbers: GX20286, GX20287, GX20006 (belt), or cross-references 690409, AUC20393, UC30568.
• Measurements: Pulley outer diameter ~4.0”, inner bearing bore ~0.625” (5/8”). Belt is 1/2” x 96.5” (Kevlar-reinforced). Measure your old belt to confirm length.
• OEM vs aftermarket: This is an aftermarket set. It matches OEM specs but is not John Deere branded. If your machine uses a different belt length (e.g., 95.5”), this won’t fit.

Key Things to Know

• Quality: Kevlar belt is durable, but pulleys are stamped steel with sealed bearings. Expect 2–3 seasons of normal residential use. Not suited for commercial mowing.
• Installation difficulty: Easy—remove deck, release belt tension, swap pulleys (usually 1–2 bolts each), route new belt per diagram. No special tools required.
• Common gotcha: The belt may be slightly tight on first install. Run deck at low throttle for a few minutes to seat it. Check belt routing—wrong path causes poor blade engagement or belt slip.
• Bearing noise: If pulleys feel rough or noisy after install, return immediately. Some units have bearing defects.

Should You Buy It

If you own a compatible John Deere (D100/L100 series with 42” or 48” deck) and need a budget-friendly, complete pulley-and-belt refresh, this set is a solid value. It’s not for heavy commercial use, but for residential mowing it works reliably. Skip if you need OEM parts for warranty or a 54” deck.