Karbay 987-02516A Hinged Mulching Plug Assembly-Replacement Part 987-02516, Compatible with Troy-Bilt, Cub Cadet, Yard Machines, and Other Top Models Mower

What It Is

The Karbay 987-02516A is an aftermarket hinged mulching plug that replaces OEM part 987-02516. It blocks the discharge chute on compatible mower decks, forcing grass clippings to recirculate for finer mulching instead of ejecting them.

Fitment & Compatibility

Before buying, verify your mower’s deck size and model line. This plug fits most 42-inch, 46-inch, and 50-inch decks on Troy-Bilt, Cub Cadet, Yard Machines, MTD, and Craftsman models from the early 2000s onward. Check your mower’s OEM part number—if it’s 987-02516, 987-02516A, or 787-02516, this will fit. Measure the discharge opening width (typically 8–10 inches) and hinge pin diameter (about 0.25 inch). It does not fit zero-turn mowers or decks with non-standard hinge spacing. Compare the plug’s hinge tab orientation (left vs. right side) to your deck before ordering.

Key Things to Know

• Quality: Made from sturdy, UV-resistant plastic. Some users report the hinge pin is slightly tight—lubricate with WD-40 if needed.
• Installation: Tool-free, takes under 5 minutes. Lift the old plug (if present), slide this one onto the hinge pins, and snap the latch closed.
• Common gotcha: If your deck has a separate deflector spring, this plug replaces the whole assembly—keep the spring if yours is still good.
• Mulching performance: Works best with sharp blades and at least 3/4 deck speed. Dull blades or wet grass will still clump.

Should You Buy It

If your OEM plug is cracked, missing, or you want to convert your side-discharge mower to mulching without buying a full kit, this is a reliable, cheap fix. It’s a direct drop-in replacement for most MTD-built lawn tractors—just confirm your deck’s hinge spacing first.