MTD Genuine Parts Mulch Kit for Tractors with 38" and 42" Decks

What It Is

This MTD Genuine Parts Mulch Kit converts your tractor’s side-discharge or bagging deck to a mulching deck, chopping clippings finer and recirculating them into the lawn for natural fertilization. Designed specifically for tractors with 38-inch and 42-inch cutting decks.

Fitment & Compatibility

Before buying, verify your deck size is exactly 38" or 42" (measure deck housing width, not blade tip path). This is an OEM MTD kit, so it fits MTD, Cub Cadet, Troy-Bilt, Yard-Man, and other MTD-owned brands with those deck sizes. Check your mower’s model number against MTD’s compatibility list (often found on the product page or in your owner’s manual). The kit includes a mulch plug, baffle, and hardware—some decks may require removing the side-discharge chute or bagger adapter. If you have a stamped steel deck, it’s likely compatible; fabricated decks or zero-turn models are not.

Key Things to Know

• Quality: Genuine MTD parts ensure exact fit and thicker steel baffles than most aftermarket kits; no bending or drilling needed.
• Installation: Moderate difficulty—requires removing the blade, installing the baffle under the deck, and mounting the plug. Expect 30–60 minutes with basic hand tools (socket wrench, screwdriver).
• Gotcha: The kit does not include mulching blades; you’ll need to buy them separately (MTD part 742-0440 or equivalent) for best mulching performance.
• Performance: Works best with dry grass; wet or tall grass will clump and leave uneven clippings. Use a sharp blade and reduce mowing speed.

Should You Buy It

Buy this if you want to eliminate bagging or side-discharge cleanup on your 38" or 42" MTD-family tractor, prefer OEM fit and reliability over cheaper aftermarket kits, and are willing to buy mulching blades separately. It’s a solid upgrade for frequent mulchers who maintain a regular mowing schedule.