Pre-Installed Bearings Idler Pulley Kit Compatible with Toro 30" Timemaster Exmark Lawn Mower, Replace 131-4529 131-4509 121-5765 125-2532 2 PCS

What It Is

This is a two-piece idler pulley kit with pre-installed bearings, designed to replace the factory pulleys on Toro 30" TimeMaster and Exmark walk-behind mowers. It guides and tensions the deck belt, reducing vibration and preventing belt slip during operation.

Fitment & Compatibility

Check these before buying:

• Deck size: Fits only 30-inch decks (not 22", 42", or zero-turn models).
• Brand/models: Toro TimeMaster 30" (models 21199, 21200, 21201, 21202) and Exmark 30" walk-behinds (Quest, Turf Tracer, and Lazer Z S-Series with 30" decks).
• OEM part numbers: Replaces Toro 131-4529, 131-4509, 121-5765, and 125-2532. Cross-check your mower’s part number on the old pulley or in your manual.
• Measurements: Pulley outer diameter is 3.25", inner bore is 0.5" (fits standard 1/2" shoulder bolts). Verify bolt size and shaft length before installing—some aftermarket bolts may need a washer stack.
• Bearing type: Pre-installed shielded bearings (no pressing required). Not compatible with pulleys that use a separate bearing and snap ring.

Key Things to Know

• Installation difficulty: Easy—remove old pulley bolt, swap pulley, re-torque to 15–20 ft-lbs. No special tools beyond a socket and wrench.
• Bearing quality: Bearings are sealed and greased, but some users report shorter lifespan (1–2 seasons) vs. OEM. Inspect annually for wobble or noise.
• Fitment note: The kit includes two pulleys, but your deck may use one 3.25" and one slightly different size. Measure both old pulleys before ordering—if they aren’t identical, this kit may only replace one.
• Common gotcha: The pre-installed bearing can spin inside the pulley bore if the bolt is overtightened. Hand-tighten then torque to spec.

Should You Buy It

Buy this kit if you need a quick, no-press replacement for a worn or noisy idler pulley on a Toro TimeMaster or Exmark 30" walk-behind. It’s a budget-friendly fix that works well for one-to-two-season use, but if you want OEM longevity or have a different deck size, spend up for genuine Toro pulleys.