2 Pack 15280 Flat Hydro Drive Idler Pulley - Replace Toro Ex-Mark 106-2176, 106-2176, for Toro TimeCutter, Ex-Mark Quest ZS3200, SS5000, SS3200, SS4250, Z420 Model

What It Is

This 2-pack of 15280 flat hydro drive idler pulleys replaces OEM Toro 106-2176 and Ex-Mark 106-2176 parts. It routes the drive belt on zero-turn mowers, maintaining tension so the hydrostatic transmission engages properly. Designed for Toro TimeCutter and Ex-Mark Quest/SS/Z420 series mowers.

Fitment & Compatibility

Before buying, verify your mower’s model number. This pulley fits:

• Toro TimeCutter (most models with 42–54” decks, check your parts diagram)
• Ex-Mark Quest ZS3200, SS5000, SS3200, SS4250, Z420 (all use the 106-2176 OEM part)
• Key spec: 4.5” outer diameter, 0.625” inner bore, flat face (no groove). Measure your old pulley’s OD and bore to confirm. If your deck is 60” or larger, this pulley may not fit—cross-reference with your belt routing diagram.

Not compatible with stamped-steel pulleys or grooved idlers used on some older Toro models (e.g., 42” recycler decks). Always check your parts manual or the existing pulley number before ordering.

Key Things to Know

• Quality: Aftermarket replacement, not OEM. Made from hardened steel with a sealed bearing. Expect similar lifespan to OEM (2–3 seasons under normal use) but may vary with heavy debris exposure.
• Installation: Easy—remove belt, unbolt old pulley (usually 5/16” or 3/8” bolt), install new one, and re-tension belt. No special tools needed. Torque to 15–20 ft-lbs.
• Gotcha: The 2-pack is convenient but you might only need one. Check if your mower uses one or two idler pulleys (most use one on the drive belt). Don’t open both if you only need one—no returns on used parts.
• Common issue: If your belt squeals or slips after replacement, the pulley may be slightly thicker than OEM. Sand the bore lightly with fine grit if it binds on the bolt.

Should You Buy It

If you own a Toro TimeCutter or Ex-Mark Quest/SS/Z420 and need a direct-fit, budget-friendly replacement for a worn or noisy idler pulley, this 2-pack is a solid value. It’s not OEM but works reliably for most users. Skip it if you prefer genuine Toro parts for warranty or commercial use—OEM pulleys cost more but may last longer under heavy daily operation.