132-9420 Flat Idler Pulley Replaces Toro 106-2175 Flat Idler Pulley for Toro 4200 4220 4225 4235 5000 MX5000 MX5050 MX5060 SS4225 SS4235 SS5000 SS5060 sw5000 Z420 Z4200 Z5000 Z5035 Tractors

What It Is

This flat idler pulley (part 132-9420) is a direct replacement for the OEM Toro 106-2175, used to tension and guide the mower deck belt on select Toro zero-turn and garden tractors. It’s critical for consistent blade engagement and belt tracking.

Fitment & Compatibility

Before buying, verify your machine’s model and deck size. This pulley fits Toro 4200, 4220, 4225, 4235, 5000, MX5000, MX5050, MX5060, SS4225, SS4235, SS5000, SS5060, SW5000, Z420, Z4200, Z5000, and Z5035 tractors—but only with 44-inch, 48-inch, 50-inch, or 52-inch decks (check your deck stamp). It replaces OEM part 106-2175. Measure the pulley: 4.0 inches outer diameter, 3/8-inch groove width, and a 5/8-inch bore. If your existing pulley has a different bore size or diameter, it’s not compatible.

Key Things to Know

• Bearing quality: This is a sealed ball bearing pulley—smoother and longer-lasting than plastic bushing pulleys. No maintenance needed.
• Installation difficulty: Easy (15 minutes). Remove the belt, unbolt the old pulley with a 5/8-inch socket or wrench, swap, and re-tension. No special tools required.
• Common gotcha: The belt groove must align perfectly with your deck’s belt path. If your old pulley wobbled or the belt was slipping, check the belt for wear and replace it at the same time.
• OEM vs aftermarket: This is an OEM Toro part—identical to the original, not a generic. No fitment guesswork.

Should You Buy It

If your Toro tractor’s deck belt is slipping, squealing, or the pulley wobbles, this is the exact fix. It’s a direct OEM replacement at a fair price, and the sealed bearing means you won’t need to grease or adjust it. Best for owners of the listed Toro models who want a reliable, drop-in repair without chasing aftermarket compatibility.