Anti-Scalp Mower Deck Wheel Roller Bearing Pulley Shoulder Bolt Brass-Plated w/Hex Flange Nut Compatible with Exmark Pioneer Quest for Toro TimeCutter Titan 112-3977 104-8301

What It Is

This is a replacement anti-scalp wheel assembly (shoulder bolt, bearing, pulley, and hex flange nut) designed to prevent the mower deck from scalping uneven terrain. It’s commonly used on zero-turn mowers like Exmark Pioneer/Quest and Toro TimeCutter/Titan models.

Fitment & Compatibility

Before buying, verify the following:

• Deck size: Works with 42–60-inch decks, but confirm your deck’s wheel mounting hole diameter (typically 5/16" or 3/8"). Measure the old bolt’s shoulder length (usually 1.5–2 inches).
• Model compatibility: Directly replaces OEM part numbers 112-3977 (Toro) and 104-8301 (Exmark). Fits Toro TimeCutter, Titan, and Exmark Pioneer/Quest series. Check your mower’s manual or existing part number.
• OEM vs aftermarket: This is a brass-plated steel aftermarket part—quality is comparable to OEM but at a lower price. Ensure the included hex flange nut matches your deck’s thread pitch (likely 3/8-16 or 5/16-18).
• Measurement check: Measure the old roller’s outer diameter (typically 3–4 inches) and the bearing’s inner diameter (matches the bolt shoulder). If dimensions match, it’s a direct swap.

Key Things to Know

• Quality: Brass plating resists rust better than plain steel, but the bearing is sealed—not serviceable. Expect 2–3 seasons of normal use before replacement.
• Installation difficulty: Easy—remove the old nut and bolt, slide out the old wheel, install the new assembly, and torque the nut to 15–20 ft-lbs. No special tools needed.
• Common gotcha: The shoulder bolt must seat fully into the bearing; if the shoulder is too long, the wheel won’t spin freely. Compare old and new bolt shoulder lengths side-by-side.
• Fitment note: Some Toro decks use a spacer washer between the wheel and deck—if your old assembly had one, reuse it with this kit.

Should You Buy It

If you own a Toro TimeCutter/Titan or Exmark Pioneer/Quest with a worn or seized anti-scalp wheel, this $10.99 kit is a solid, budget-friendly fix. It’s a direct fit for the listed OEM parts, easy to install, and the brass plating adds corrosion resistance. Skip it only if your deck uses a different bolt size or wheel diameter.