HD Switch - Deck Belt Pulley Upper & Lower Idler Arm Tensioner, Bushing & Hardware Kit fits John Deere G100 GT225 GT235 GT235E GT242 GT245 GT262 GT275 GX255 GX325 GX335 GX345 GX355 Tractor Lawn Mower

What It Is

This is a complete replacement kit for the upper and lower idler arm tensioner assemblies on the deck belt pulley system of John Deere G100, GT200, and GX200 series lawn tractors. It includes the pulleys, bushings, and hardware needed to restore belt tension and prevent deck belt slippage or premature wear.

Fitment & Compatibility

Before buying, confirm your mower model matches the list: G100, GT225, GT235, GT235E, GT242, GT245, GT262, GT275, GX255, GX325, GX335, GX345, GX355. This kit fits 42-inch and 48-inch deck sizes common on these models. Measure the existing pulley diameter (typically 4 inches for the upper, 3.5 inches for the lower) and compare to the kit’s included pulleys. If your deck uses a different belt routing or a single idler arm, this kit won’t work. OEM part numbers to cross-reference include AM136033, AM136034, AM136035, and AM136036. This is a non-OEM aftermarket kit, so verify bolt sizes (usually 5/16-18 or 3/8-16) match your deck’s mounting holes.

Key Things to Know

• Quality: The bushings are sintered bronze or nylon, which may wear faster than OEM steel bushings under heavy use. Inspect after 50 hours.
• Installation difficulty: Moderate. You’ll need a socket set, a breaker bar for stubborn bolts, and a belt removal tool. Expect 45–60 minutes.
• Common gotcha: The hardware kit may include extra washers or spacers not needed for your specific deck. Keep the old hardware as a reference.
• Belt tension: After installing, manually rotate the pulleys to ensure they spin freely. Overtightening the idler arm can bind the belt.

Should You Buy It

If you own one of the listed John Deere tractors and need to replace a worn or seized idler arm assembly, this kit is a cost-effective solution at $31.99. It’s best for DIYers comfortable with basic deck maintenance and who don’t need OEM durability for commercial use. For heavy-duty mowing, consider OEM parts.