132-4718 Pulley Replaces 1-603843 E603843 116-3626 109-8891 for Toro 48" 54" 60" Z147 Z148 Z149 Z150 Z400 ZX440 ZX480 ZX4800 ZX4820 ZX5400 ZX5420 MX5480 MX6000 ZX6000 ZX6020 Mowers

What It Is

This is a replacement idler or tension pulley for the belt drive on Toro zero-turn mowers with 48", 54", or 60" decks. It guides and tensions the deck belt, keeping it engaged for consistent blade operation. Used on Z400, ZX4000, ZX5000, MX, and Z100 series models.

Fitment & Compatibility

Before buying, confirm your mower uses a 3.5-inch diameter pulley with a 5/8-inch bore (common for Toro Z-models listed). Cross-reference your OEM part number: this replaces Toro 1-603843, E603843, 116-3626, and 109-8891. It fits decks on Z147, Z148, Z149, Z150, Z400, ZX440, ZX480, ZX4800, ZX4820, ZX5400, ZX5420, MX5480, MX6000, ZX6000, and ZX6020. Verify your deck size (48", 54", 60") and that the pulley is used as a flat idler (not a V-groove tensioner). Measure your old pulley’s diameter and bore to be safe—some aftermarket pulleys vary by 0.1 inch.

Key Things to Know

• Quality: Aftermarket replacement, not OEM Toro. Most users report it holds up well, but check for burrs on the bearing race before installing—lightly sand if needed.
• Installation: Easy—remove the old pulley bolt, swap the pulley, and torque to 20-25 ft-lbs. No special tools required, but a socket extension helps on tight decks.
• Common gotchas: The bearing is sealed and non-serviceable—if it starts squeaking, replace it. Also, ensure the pulley spins freely before mounting; a stiff bearing will wear your belt faster.
• Price vs. OEM: At $14.99, it’s roughly half the cost of a genuine Toro pulley, making it a budget-friendly choice for frequent replacements.

Should You Buy It

If you need a quick, affordable replacement for a worn idler pulley on a compatible Toro Z-series mower, this is a solid choice. It’s not OEM, but the 4.7-star rating and low price make it ideal for DIY maintenance. Skip it if you prefer genuine Toro parts for heavy commercial use—aftermarket bearings may wear slightly faster under daily abuse.