HD Switch - Deck Belt Pulley Lower Idler Arm Tensioner, Bushing & Hardware Kit fits John Deere 180 240 245 260 265 320 325 335 345 355D Tractor Lawn Mowers

What It Is

This HD Switch kit replaces the lower idler arm tensioner assembly for the deck belt on John Deere 200- and 300-series lawn tractors (models 180, 240, 245, 260, 265, 320, 325, 335, 345, 355D). It includes the pulley, bushing, and hardware needed to restore proper belt tension and prevent belt slip or deck noise.

Fitment & Compatibility

• Machines: Fits John Deere 180, 240, 245, 260, 265, 320, 325, 335, 345, 355D (gas and diesel).
• Deck sizes: Typically 38", 42", 48", and 54" decks on these models—verify your deck’s idler arm shape and pulley diameter (usually 3.5”–4”).
• OEM cross: Replaces John Deere part numbers M152630, M155663, or AM137431 (check your existing pulley for stamp).
• What to measure: Ensure the bushing inner diameter matches your spindle shaft (commonly 1/2” or 5/8”). Measure your old arm length and pulley offset to avoid belt misalignment.
• Kit includes: Pulley, arm, bushing, and all necessary bolts/washers—no extra hardware needed.

Key Things to Know

• Quality: HD Switch is an aftermarket brand; the pulley is steel with a sealed bearing. Expect similar durability to OEM, but inspect the bushing fitment—some users report needing slight filing on the bushing for a perfect fit on older decks.
• Installation difficulty: Moderate. Requires removing the deck, belt, and old idler arm. Basic hand tools (wrenches, socket set) and a jack or blocks to support the deck. Expect 30–60 minutes.
• Common gotcha: The bushing may be slightly tight on some shaft diameters—test-fit before fully assembling. Also, ensure the arm’s pivot bolt is torqued to 20–25 ft-lbs; overtightening can bind the arm.
• Belt routing: Double-check your deck belt diagram after installation—wrong routing will cause premature wear on the new pulley.

Should You Buy It

If you’re restoring a John Deere 180–355D with a worn or noisy deck belt tensioner, this kit is a solid, budget-friendly fix. It’s ideal for DIY homeowners who want a complete drop-in replacement without sourcing OEM parts. Avoid if you need a heavy-duty commercial-grade part—this is for standard residential use.