106-3987 Blade Driver Assembly/108-3766-03 Blade Support/125-2466 Blade Bolt Compatible with Toro 21" 22" Recycler Lawn Mower ​Replaces 104-8687, 104-8695, 400-320, 105-8579

What It Is

This is a three-piece blade mounting system for Toro Recycler mowers: a blade driver assembly (106-3987), a blade support (108-3766-03), and a blade bolt (125-2466). It connects the blade to the engine crankshaft and allows the blade to pivot on impact, reducing damage to the mower and engine.

Fitment & Compatibility

• Deck size: Fits Toro 21” and 22” Recycler mowers. Measure your deck width before ordering—this won’t fit 20” or larger commercial decks.
• Model check: Compatible with Toro Recycler models like 20332, 20333, 20334, 20335, 20336, 20337, 20338, 20339, and many “Super Recycler” variants. Verify your model number on the sticker under the seat or on the frame.
• OEM vs aftermarket: This is an OEM Toro part (not generic). It replaces older part numbers 104-8687, 104-8695, 400-320, and 105-8579. If your mower uses a different bolt or support, this may not fit.
• Measurements: The blade bolt is 5/16-24 thread, 1.25” long. The driver assembly has a 7/8” hex center. If your old parts are visibly different (e.g., a shorter bolt or different driver shape), don’t assume compatibility.

Key Things to Know

• Installation difficulty: Moderate. You’ll need a socket wrench, torque wrench, and a blade removal tool (or block of wood) to hold the blade. Torque the bolt to 55-65 ft-lbs.
• Common gotcha: The blade driver is directional—the arrow on top must point toward the discharge chute. Installing it backward will cause vibration and poor cutting.
• Quality: OEM Toro parts are cast steel, not stamped. They hold up better than cheap aftermarket alternatives, but the bolt can rust if you leave it wet. Use anti-seize on the threads.
• What’s included: Only the driver, support, and bolt. You need to reuse your existing blade or buy a new one separately.

Should You Buy It

Buy this if you own a Toro 21” or 22” Recycler and need to replace a worn, bent, or missing blade driver assembly—especially if your old parts are cracked or the blade won’t spin freely. It’s a direct OEM replacement, which means no fitment guesswork. Skip it if you need a full blade kit (this doesn’t include the blade itself) or if your mower uses a different drive system (e.g., Personal Pace or TimeCutter models).