Lawn Mower TimeCutter Traction Drive Cogged Belt Compatible with Toro 139-2399

What It Is

This is a replacement traction drive belt for zero-turn mowers, specifically the Toro TimeCutter series. It transfers power from the engine to the hydrostatic pumps, enabling forward/reverse movement on the mower.

Fitment & Compatibility

• OEM Part: Replaces Toro 139-2399 (original equipment number). Aftermarket versions may vary slightly in length or tension.
• Mower Models: Fits Toro TimeCutter models like SS4225, SS4235, MX4250, MX4260, and ZS4200. Check your model number—not all TimeCutters share the same belt. Verify on the Toro website or your owner’s manual.
• Measurements: Belt is 1/2" wide x 86.5" long (cogged). Measure your old belt if possible—aftermarket belts can be ±0.5" off, affecting tension.
• Deck Size: Not deck-specific; this is for the traction drive, not the cutting deck belt. Don’t confuse it with the mower deck belt.

Key Things to Know

• Quality: Aftermarket versions (like this one at $22.85) are cheaper than OEM ($40+). Some users report shorter lifespan or slight fit issues. Check reviews for your specific mower.
• Installation Difficulty: Moderate—requires removing the deck or side panels to access the pulleys. A belt tensioner tool or pry bar is helpful. Disconnect the spark plug before working.
• Common Gotcha: The belt routing is specific—follow a diagram (often on the mower frame or in the manual). Wrong routing causes slipping or premature wear.
• Cogged vs. Smooth: Cogged belts (like this one) grip better on small pulleys. Ensure it’s not a smooth replacement.

Should You Buy It

Buy this if you need a budget-friendly replacement for a Toro TimeCutter traction drive belt and you’re comfortable with moderate DIY installation. Skip it if you want OEM reliability, have a non-Toro mower, or need a deck belt instead.