q&p Outdoor Power 106-2175 Flat Idler Pulley Replaces Exmark Toro 32 38 42 50 and 54 Inch Deck Quest E-Series S-Series Time Cutter

What It Is

This flat idler pulley (part #106-2175) guides and tensions the drive belt on select Toro and Exmark zero-turn mowers with 32 to 54-inch decks. It’s a direct replacement for the OEM pulley that keeps the blade belt from slipping or coming off during operation.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size – fits Toro 32, 38, 42, 50, and 54-inch decks (check your deck’s stamped number).
• Model series – works with Toro TimeCutter, Quest, E-Series, and S-Series, plus Exmark Quest and S-Series. Not for all Toro or Exmark models; verify your mower’s model number.
• Measurements – pulley diameter is 4.0” (outside) with a 5/8” bore. Measure your old pulley’s diameter and shaft size to confirm.
• OEM cross-reference – replaces Toro 106-2175 and Exmark 106-2175. Aftermarket, but matches OEM specs.

Key Things to Know

• Quality – metal construction with sealed ball bearings. Holds up well under normal use, but not as heavy-duty as OEM for commercial mowing.
• Installation – easy swap. Remove the belt, unbolt the old pulley (usually a 5/16” or 3/8” bolt), install the new one, and re-tension the belt. Basic hand tools only.
• Common gotcha – the pulley is flat, not grooved. If your deck uses a grooved idler, this won’t work. Double-check your old pulley’s profile.
• No spacers included – you’ll reuse the original bolt and any washers/spacers from your mower.

Should You Buy It

If you own a compatible Toro or Exmark zero-turn and your idler pulley is worn (noisy, wobbling, or belt slipping), this is a solid, budget-friendly fix. It’s not for heavy commercial use, but for residential or light commercial mowing, it’s a reliable drop-in replacement that saves you OEM markup.