106-2175 Idler Pulley Replacement 132-9420, Flat Idler Pulley Compatible with Toro Timecutter SS5000 SS4235 MX5060 42 50 inch Deck Zero Turn Riding Mower, Replaces Ro tary 12901, 3 Pack

What It Is

This is a flat idler pulley (3-pack) that guides and tensions the drive belt on select Toro Timecutter zero-turn mowers with 42- or 50-inch decks. It replaces worn or noisy pulleys to keep the blade belt tracking correctly.

Fitment & Compatibility

• Direct fit for: Toro Timecutter SS5000, SS4235, MX5060, and other models with 42" or 50" decks using OEM part 106-2175 or 132-9420.
• Replaces: Rotary 12901.
• What to check before buying:
  • Confirm your deck size (42" or 50") and model number.
  • Measure the pulley bore (typically 1/2") and outer diameter (approx. 4.0" flat).
  • Verify belt routing—this is a flat pulley, not a grooved one.
  • If your mower uses a different pulley shape or size, this won’t work.

Key Things to Know

• Quality: Aftermarket part; generally good for the price, but some users report slightly tighter bearing fit than OEM.
• Installation difficulty: Easy—remove belt, unbolt old pulley, bolt on new one. Use a socket wrench; no special tools.
• Common gotcha: The pulley may have a thin metal shield that can warp if over-tightened. Torque to hand-tight plus a quarter turn.
• Pace yourself: You get three pulleys; you likely only need one or two. Check your deck for the actual number of flat idlers.

Should You Buy It

If you have a Toro Timecutter with a 42" or 50" deck and need a budget-friendly flat idler replacement, this 3-pack works well. It’s not OEM, but it’s reliable for the price and easy to install. Skip it if you need a grooved pulley or a different size.