ILONPA 1-633109 Flat Idler Pulley for Exmark Toro 116-4667 126-7685 for Lazer Z AS AC HP Toro Z Master 52 60 72 inch Deck (2 Pack)

What It Is

The ILONPA 1-633109 Flat Idler Pulley is a replacement part for the belt tensioning system on Exmark Lazer Z and Toro Z Master zero-turn mowers with 52-, 60-, or 72-inch decks. It keeps the drive belt properly tensioned to prevent slipping and ensure consistent blade engagement.

Fitment & Compatibility

Check before buying:

• OEM cross-references: Replaces Exmark 1-633109, Toro 116-4667 and 126-7685. Verify your mower’s OEM part number matches one of these.
• Deck size: Confirmed fit for 52", 60", and 72" decks on Exmark Lazer Z AS/AC/HP and Toro Z Master models. Not for 48" decks.
• Measurements: Pulley diameter is approximately 4.5 inches, shaft bore is 1/2 inch, and it uses a 3/8-inch bearing. Measure your old pulley’s outer diameter and bore to confirm.
• Model year: Generally fits 2000s–2010s models. Double-check your mower’s serial number against Exmark/Toro parts diagrams if unsure.

Key Things to Know

• Quality: Aftermarket part with solid reviews; bearing is sealed and runs smooth. Not OEM, but holds up well under normal residential/commercial use.
• Installation: Easy swap—remove belt tension, unbolt the old pulley (usually a single bolt), and bolt the new one on. Use a torque wrench (25–30 ft-lbs) to avoid over-tightening.
• Common gotcha: The flat idler pulley sits on a stationary spindle, not a spring-loaded arm. Make sure the belt routing matches the diagram for your deck—wrong routing causes premature wear.
• Pack size: Comes as a 2-pack, so you can replace both flat idlers at once. Keep the spare for future maintenance.

Should You Buy It

Buy this if you need a budget-friendly, reliable replacement for a worn flat idler on your Exmark Lazer Z or Toro Z Master with a 52–72" deck. It’s a straightforward DIY fix that saves money over OEM parts, and the 2-pack gives you a backup for later. Skip it if you need a grooved or spring-loaded pulley—this is strictly a flat idler.