116-4667 Flat Idler Pulley for Ex Mark 52" 60" 72" Deck Lazer Z AS HP XS Zero Turn Mower, Toro 74413 Z Master Lawn Mower, Replacement Ex Mark Lazer Z Parts 116-4667, Riding Mower

What It Is

The 116-4667 flat idler pulley is a replacement guide pulley for the mower deck drive belt system on zero-turn mowers like Ex Mark Lazer Z (52", 60", 72" decks) and Toro Z Master 74413. It keeps belt tension and alignment, preventing slipping or throwing.

Fitment & Compatibility

• OEM Part Number: 116-4667 (Ex Mark/Toro genuine) – aftermarket versions exist, but verify exact dimensions.
• Deck Sizes: Fits 52", 60", and 72" decks on Ex Mark Lazer Z, AS, HP, XS series and Toro Z Master 74413.
• What to check before buying:
  • Measure the pulley outer diameter – should be 4.0" (some aftermarket pulleys may be slightly smaller).
  • Check the bearing bore size – it’s 5/8" (0.625") for a standard 5/8" shoulder bolt.
  • Confirm your deck uses a flat idler pulley (not a grooved one) – this is a smooth, flat-faced pulley.
  • Verify your mower model number (e.g., Lazer Z 6020, Toro 74413) – not all Ex Mark or Toro decks share the same idler layout.

Key Things to Know

• Quality: OEM Toro/Ex Mark pulleys use sealed bearings that last longer than many aftermarket replacements. Cheap aftermarket pulleys may have loose bearings that wear out in one season.
• Installation difficulty: Easy – remove the belt, unbolt the old pulley (usually a 5/8" or 9/16" bolt), install the new one, and re-tension the belt. No special tools needed.
• Common gotchas:
  • The belt must be routed correctly around this pulley – wrong routing causes rapid wear or belt slip.
  • Over-tightening the mounting bolt can crush the bearing; torque to 20-25 ft-lbs max.
  • If your deck has two idler pulleys, make sure you’re replacing the flat one, not a grooved one.

Should You Buy It

If your Ex Mark Lazer Z or Toro Z Master deck is throwing belts, making squealing noises, or the pulley wobbles, this is a direct, cost-effective fix. It’s ideal for DIY owners who want a reliable OEM-spec part without dealer markup. Avoid cheap no-name pulleys – this one’s worth the extra few dollars for sealed bearings and proper fit.