127783 Pulley Idler Craftsman Replaces 532139245 Pulley, 127783 Idler Pulley, Craftsman 139245 Idler Pulley, 532127783 Idler Pulley for Husqvarna YTH 18542, LTH1342, YTH150, YTH 2448 Tractors

What It Is

The Craftsman 127783 Idler Pulley is a replacement tensioner pulley that routes and tensions the mower deck drive belt on select Craftsman, Husqvarna, and Poulan lawn tractors. It’s a common wear part for 42-inch and 46-inch cutting decks.

Fitment & Compatibility

• OEM Cross-Reference: Replaces Craftsman 532139245, 532127783, and 139245. Also fits Husqvarna 532127783.
• Check Your Model: Confirmed fit for Craftsman LTH1342, YTH150, YTH18542, and Husqvarna YTH2448. Not universal—verify your tractor’s model number (often on a sticker under the seat or on the frame).
• Measurements: 4-inch outer diameter, 3/8-inch inner bearing bore. If your original pulley differs, it won’t fit.
• Deck Size: Designed for 42-inch and 46-inch decks. Measure your deck width if unsure.
• Aftermarket Note: This is a non-OEM replacement. Quality is generally good, but inspect the bearing smoothness before installation.

Key Things to Know

• Easy swap: Requires basic hand tools (socket wrench, possibly a puller if rusted). No special skills needed—just remove the old pulley and bolt on the new one.
• Bearing life: The sealed bearing is pre-lubricated. Expect 2–3 seasons of typical use before replacement.
• Common gotcha: The pulley bolt can seize. Use penetrating oil and a breaker bar. Replace the bolt if it’s stripped.
• Belt alignment: After installing, spin the pulley by hand. If it wobbles or binds, the belt path is off—recheck your routing.

Should You Buy It

Buy this if you need a direct, low-cost replacement for a worn or noisy idler pulley on a Craftsman or Husqvarna tractor with a 42- or 46-inch deck. It’s a reliable aftermarket option at half the price of OEM, but skip it if you need a different size or a genuine factory part for warranty purposes.