2 Pack 132-4718 Pulley Replace 1-603843 Flat Idler Pulley 116-3626 E603843 132-7543 for Toro MX5480 MX5400 ZX4800 ZX5400 ZX4820 ZX5420 ZX4800 Z147 Z149 Z148 Riding Mowers

What It Is

This is a 2-pack of flat idler pulleys designed to replace OEM parts 132-4718, 1-603843, 116-3626, E603843, and 132-7543. It routes and tensions the deck belt on select Toro zero-turn and riding mowers with 48" to 54" cutting decks.

Fitment & Compatibility

Check your model and deck size before buying. This pulley fits Toro MX5480, MX5400, ZX4800, ZX5400, ZX4820, ZX5420, ZX4800, Z147, Z149, and Z148 mowers—but only those with a 48" or 54" deck. Measure the pulley outer diameter (should be 3.5") and the inner bearing bore (0.5") to confirm. Verify your OEM part number matches one of the five listed above. This is an aftermarket set, not genuine Toro, so double-check the flat pulley flange shape (some originals are slightly different). If your mower uses a different pulley size or a v-groove idler, this won’t work.

Key Things to Know

• Quality is solid for the price. Sellers report these hold up well under normal residential use, but may wear faster than OEM on heavy commercial duty.
• Installation is straightforward. Remove the old pulley (usually a single bolt), swap in the new one, and re-tension the belt. No special tools needed, but a socket wrench and a breaker bar for stubborn bolts help.
• Common gotcha: The pulley bolt can be seized or rusted. Soak with penetrating oil before trying to remove. Also, the belt may need re-routing if the old pulley was worn and changed belt tension.
• The 2-pack is handy if you have two idler pulleys to replace at once (common on these decks) or want a spare.

Should You Buy It

Yes, if you need a budget-friendly replacement for a worn flat idler pulley on a compatible Toro 48" or 54" deck and you’re comfortable with basic DIY. For heavy commercial use or if you prefer exact OEM fit, stick with genuine Toro. For most homeowners, this is a reliable, cost-effective fix.