633166 Idler Pulley Replacement for Toro / Exmark Mower Decks

Overview

This aftermarket 633166 idler pulley is a replacement mower deck pulley for compatible Toro and Exmark mower deck applications, including select Lazer Z AS, Lazer Z XS Diesel, TimeCutter, and Toro walk-behind mower models.

Use this listing when your original pulley number matches 633166, 1-633166, or 1633166. This pulley has a 6-inch outside diameter, 0.62-inch bore, and 1.07-inch pulley width.

Key Features

• Product Type: Idler Pulley
• Outside Diameter: 152.4 mm | 6 in
• Bore / Center Hole: 15.8 mm | 0.62 in
• Pulley Width: 27.3 mm | 1.07 in
• Weight: 1 lb 9 oz
• Aftermarket replacement pulley for mower deck belt-drive systems
• Use for compatible riding mower, zero-turn mower, and walk-behind mower deck applications

Compatible Brands & Model Series

Common compatible Exmark and Toro model paths include:

Exmark

• LAS23KC524: 52-inch Lazer Z AS zero-turn mower, 23HP Kohler, serial numbers 600000-669999, 2006
• LAS25KC604: 60-inch Lazer Z AS zero-turn mower, 25HP Kohler, serial numbers 600000-669999, 2006; 670000-719999, 2007; 720000-789999, 2008
• LAS25KC604N: 60-inch Lazer Z AS zero-turn mower, 25HP Kohler, serial numbers 720000-789999, 2008
• LAS28KA524: 52-inch Lazer Z AS zero-turn mower, 28HP Kawasaki, serial numbers 670000-719999, 2007; 720000-789999, 2008
• LAS28KA604: 60-inch Lazer Z AS zero-turn mower, 28HP Kawasaki, serial numbers 670000-719999, 2007; 720000-789999, 2008
• LAS28KA724: 72-inch Lazer Z AS zero-turn mower, 28HP Kawasaki, serial numbers 670000-719999, 2007; 720000-789999, 2008
• LAS28KA724N: 72-inch Lazer Z AS zero-turn mower, 28HP Kawasaki, serial numbers 720000-789999, 2008
• LXS25KD605: 60-inch Lazer Z XS Diesel zero-turn mower, 25HP Kubota, serial numbers 600000-669999, 2006; 670000-719999, 2007; 720000-789999, 2008; 790000-849999, 2009
• LXS25KD605 XS: 60-inch Lazer Z XS Diesel zero-turn mower, 25HP Kubota, serial numbers 600000-669999, 2006
• LXS25KD665: 66-inch Lazer Z XS Diesel zero-turn mower, 25HP Kubota, serial numbers 600000-669999, 2006; 670000-719999, 2007; 720000-789999, 2008; 790000-849999, 2009
• LXS25KD665 XS: 66-inch Lazer Z XS Diesel zero-turn mower, 25HP Kubota, serial numbers 600000-669999, 2006
• LXS25KD725: 72-inch Lazer Z XS Diesel zero-turn mower, 25HP Kubota, serial numbers 670000-719999, 2007; 720000-789999, 2008; 790000-849999, 2009

Toro

• 74432 / ZD 380: 97 cm TimeCutter zero-turn mower, 38-inch deck, serial numbers 260000001-260999999, 2006; 270000001-270999999, 2007
• 74433 / ZD 420: 42-inch TimeCutter zero-turn mower, 42-inch deck, serial numbers 260000001-260999999, 2006; 270000001-270999999, 2007; 280000001-280999999, 2008; 290000001-290999999, 2009; 311000001-311999999, 2011
• 74434 / ZD 530: 42-inch TimeCutter zero-turn mower, 42-inch deck, serial numbers 270000001-270999999, 2007
• 74437 / ZD 420 T: 42-inch TimeCutter zero-turn mower, 42-inch deck, serial numbers 290000001-290999999, 2009; 311000001-311999999, 2011
• 30031: 91 cm walk-behind mower, T-Bar, gear drive, 15HP, serial numbers 270000001-270999999, 2007; 280000001-280999999, 2008; 290000001-290999999, 2009; 310000001-310999999, 2010; 311000001-311999999, 2011
• 30032: 91 cm walk-behind mower, T-Bar, hydro drive, 15HP, serial numbers 270000001-270999999, 2007; 280000001-280999999, 2008
• 30070: 91 cm walk-behind mower, T-Bar, gear drive, 16HP, serial numbers 311000001-311999999, 2011; 312000001-312999999, 2012; 313000001-313999999, 2013; 314000001-314999999, 2014; 315000001-315999999, 2015; 316000001-316999999, 2016; 404320000-999999999
• 30071: 91 cm walk-behind mower, T-Bar, hydro drive, 16HP, serial numbers 313000001-313999999, 2013; 314000001-314999999, 2014; 400000000-404319999; 404320000-999999999
• 30074: 36-inch walk-behind mower, floating deck, T-Bar, gear drive, serial numbers 310000001-310999999, 2010; 311000001-311999999, 2011; 312000001-312999999, 2012; 313000001-313999999, 2013; 314000001-314999999, 2014
• 30094: 36-inch walk-behind mower, floating deck, T-Bar, gear drive, serial numbers 290000001-290001000, 2009; 290001001-290999999, 2009

Replaces OEM Part Numbers

• Exmark / Toro: 1-633166
• Exmark / Toro: 633166
• Exmark / Toro: 1633166

Common Symptoms of a Worn Deck Pulley

• Mower deck belt squealing, slipping, or jumping off track
• Visible pulley wobble or uneven belt tracking
• Grinding, rattling, or bearing noise near the deck pulley
• Reduced blade speed or inconsistent cut quality caused by poor belt tension

Why Buy From PTO Direct USA?

• Fast USA shipping
• Fitment-focused replacement parts support
• Clear part-number matching to help reduce wrong-part orders
• Replacement mower deck parts for homeowners, shops, and landscape crews

Need Help Confirming Fitment?

If you are not sure this is the correct pulley, send us your mower model number, deck size, and the part number from your original pulley. We can help compare the replacement path before you order.

FAQ

How do I confirm this pulley fits my mower?

Start by matching the OEM pulley number on your original part. Then compare the outside diameter, bore or center-hole size, pulley width, belt profile, deck layout, and mower model.

Can I order by appearance alone?

No. Similar-looking deck pulleys can have different bore sizes, offsets, belt profiles, and deck applications. Match the part number and dimensions first.

What causes a mower deck pulley to fail?

Common causes include worn bearings, belt misalignment, impact damage, seized hardware, or long-term wear from deck belt tension.

Need another pulley? Browse the full mower deck pulley collection for additional replacement options.