AM128118 Mower Deck Idler Pulley Compatible with John Dee-re GT225 GT235 GT245 LT170 LX255 LX266 LX277 LX279 X324 GX335 Z245 Z255 Z355 Z425 Z435 Z445 Z465 Z625 Z645 Z655 Z665
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🛒 See Price on AmazonWhat It Is
The AM128118 mower deck idler pulley is a replacement part that guides and tensions the deck drive belt on a wide range of John Deere lawn tractors, zero-turn mowers, and garden tractors. It’s designed for machines with 42-inch to 54-inch Edge, 7-Iron, or Accel Deep mower decks.
Fitment & Compatibility
Before buying, check your model’s deck size and type. This pulley fits GT225, GT235, GT245, LT170, LX255, LX266, LX277, LX279, X324, GX335, Z245, Z255, Z355, Z425, Z435, Z445, Z465, Z625, Z645, Z655, and Z665 – but only with specific decks (e.g., 42C, 48C, 54C). Measure your old pulley: the AM128118 has a 3.5-inch outer diameter, a 5/8-inch bore, and uses a 6202 bearing. Confirm your deck’s idler arm bolt is 5/8-inch. This is an aftermarket part, not OEM, so verify belt routing and pulley location (flat vs. grooved) match your deck diagram.
Key Things to Know
- Quality: Aftermarket pulleys often use sealed bearings and stamped steel. This one has good reviews, but inspect the bearing for smooth rotation before install – cheap bearings can fail quickly.
- Installation difficulty: Easy, usually 10-20 minutes. Remove belt, unbolt the old pulley (likely a 15/16-inch or 5/8-inch bolt), swap, and re-tension belt. No special tools needed.
- Common gotcha: The pulley’s flat face vs. grooved side matters. This is a flat idler pulley – if your deck uses a grooved pulley for belt tracking, this won’t work. Check your old pulley’s profile.
- Torque: Tighten the center bolt to 20-25 ft-lbs; overtightening can warp the pulley or damage the bearing.
Should You Buy It
If you need a budget-friendly replacement for a worn or noisy idler pulley on a compatible John Deere model, this is a solid choice. It’s easy to install and costs a fraction of OEM, but inspect the bearing quality before use. Not suitable for decks requiring a grooved pulley or precise OEM fit.
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