Exmark 116-2456 Flat Idler Pulley Quest Pioneer Radius E P S X Series

What It Is

The Exmark 116-2456 is a flat idler pulley that maintains belt tension and guides the drive belt on select Exmark zero-turn mowers. It’s designed for Quest, Pioneer, Radius, E, P, and S X Series models.

Fitment & Compatibility

Before buying, verify your mower’s model and serial number against Exmark’s fitment chart. This pulley fits decks from 48" to 60" on the listed series. Measure the pulley’s outer diameter (4.0") and bore size (0.625") to confirm match with your existing pulley—replace only if dimensions are identical. This is an OEM Exmark part, not an aftermarket generic. Check your belt routing diagram to ensure the pulley sits in the correct flat idler position.

Key Things to Know

• Direct replacement – No modifications needed if your mower uses the 116-2456; simply remove the old pulley and install the new one with the same hardware.
• Installation difficulty – Easy (hand tools only). You’ll need a socket wrench and possibly a breaker bar for stubborn bolts. No special skills required.
• Common gotcha – The pulley’s bearing is sealed and non-serviceable. If it’s noisy or wobbling, replace it immediately to avoid belt damage or deck wear.
• Quality note – OEM pulleys are built with sealed bearings and a steel hub for longer life vs. cheap replacements. Expect 2–3 seasons of typical residential use.

Should You Buy It

Buy it if you own a compatible Exmark zero-turn and need a direct, reliable replacement for a worn or noisy flat idler pulley. At $21.99, it’s a fair price for OEM quality that avoids fitment headaches and premature belt failure. Skip it only if you’re certain your mower uses a different pulley size or bore.