Genuine Toro OEM (Fits Exmark)133-4371 V-Belt for Toro Timecutter/Titan and Exmark Quest Riding Mowers

What It Is

This is the OEM V-belt (part 133-4371) that drives the blades on select Toro TimeCutter and Titan zero-turn mowers, as well as Exmark Quest models. It is a direct replacement for the original belt in the cutting deck system.

Fitment & Compatibility

Before buying, verify your mower model and deck size. This belt fits:

• Toro TimeCutter models with 42", 46", and 50" decks (e.g., SS4225, SS4625, SS5000, SWX4250, SWX4650).
• Toro Titan models with 50" and 54" decks (e.g., MX5400, MX5500, MX5450, MX5550).
• Exmark Quest models with 42", 48", 50", and 54" decks (e.g., QZT, QST, QLK series).

Check your mower’s model number (on the frame or under the seat) against Toro’s official compatibility list. Measure your existing belt—this belt is 1/2" wide and 133.5" long. Using an aftermarket belt may cause slipping or premature wear; this OEM part ensures correct length and tension.

Key Things to Know

• Quality: Genuine Toro OEM belt—more durable than most aftermarket belts, with reinforced rubber and proper stiffness for consistent blade engagement.
• Installation difficulty: Moderate. You’ll need to remove the deck or access the belt routing under the mower. A belt routing diagram is often printed on the deck or in the manual. Use a wrench to release tension on the idler pulley.
• Common gotchas: The belt can be tight—use a belt tool or pry bar to install, not a screwdriver (which can damage the belt). Check for worn pulleys or bearings before installing; a seized idler will quickly ruin a new belt.
• Signs of wear: Replace if you see fraying, cracking, glazing, or if blades stop engaging or slip during cutting.

Should You Buy It

Buy this if you own a compatible Toro TimeCutter, Titan, or Exmark Quest and want a reliable, exact-fit replacement that will last a season or more of regular use. It’s the right choice for owners who prefer OEM quality over cheaper aftermarket belts that may not hold tension or fit precisely.