731-07486 Side Discharge Chute and 987-02516A Hinged Mulching Plug Compatible with 21" Deck Chute MTD, Troy Bilt TB100, TB105, TB110, TB120,Craftsman Lawn Mower

What It Is

This set includes a side discharge chute (731-07486) and a hinged mulching plug (987-02516A) for 21-inch deck walk-behind mowers. It lets you switch between side-discharge and mulching modes on select MTD, Troy-Bilt, and Craftsman models (TB100, TB105, TB110, TB120 series).

Fitment & Compatibility

• Deck size: Fits only 21-inch decks. Measure your deck width—don’t assume from model number.
• Models: Works with MTD, Troy-Bilt TB100–TB120, and Craftsman mowers using these part numbers. Check your owner’s manual or existing chute/plug for the OEM number.
• OEM vs aftermarket: This is a direct replacement, not a universal fit. If your original chute or plug is damaged or missing, this matches the factory dimensions.
• Hinge check: The mulching plug has a hinge that must align with your deck’s mounting tab. Verify the tab is present and undamaged before buying.

Key Things to Know

• Installation: Tool-free—snap the chute onto the deck’s discharge opening and pivot the plug into the rear mulching slot. Takes under 5 minutes.
• Quality: Plastic construction is durable for normal residential use, but avoid hitting curbs or rocks—cracks can occur on impact.
• Common gotcha: The hinged plug may feel loose initially; it’s designed to pivot freely. If it rattles, check the mounting tab for wear.
• Mulching performance: Works best with sharp blades. Dull blades leave clippings clumpy even with the plug installed.

Should You Buy It

If your OEM chute or plug is cracked, lost, or missing, this is a cost-effective, direct-fit replacement. It’s ideal for homeowners with 21-inch MTD/Troy-Bilt/Craftsman mowers who want quick switching between discharge and mulching. Not for commercial use or decks over 21 inches.