MTD OEM 731-09173A Replacement Part Bagger Lower Chute for Mowers, Fits MTD, Craftsman, Troy-Bilt, Cub Cadet and Other Top Models

What It Is

The MTD OEM 731-09173A is a replacement lower chute for lawn mower bagging systems. It connects the mower deck’s discharge opening to the bagger assembly, directing grass clippings into the collection bag. Designed for MTD-built mowers, it’s commonly used on 42-inch to 54-inch side-discharge decks with compatible bagger kits.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size & model: Fits most 42", 46", 50", and 54" MTD-built decks, but not universal. Check your mower’s model number (stamped on the deck or frame) against MTD’s compatibility list.
• Brand & series: Works on MTD, Craftsman (T110, T120, T130, T150, T160), Troy-Bilt (Pony, Bronco, Super Bronco), Cub Cadet (XT1, XT2, XT3, LT series), and Yard Machines. Not for John Deere, Husqvarna, or Toro.
• OEM vs aftermarket: This is an OEM MTD part, so fit is exact for compatible models. Aftermarket versions may vary in plastic thickness and hinge alignment. Measure your current chute’s mounting hole spacing (typically 3.5") to confirm.

Key Things to Know

• Installation difficulty: Easy – typically replaces with two bolts and a spring. No special tools needed. Watch for a small hinge pin that can pop out during removal.
• Quality: Durable ABS plastic resists cracking from UV and impacts. Some users report the hinge tabs can break if the bagger is overstuffed or forced shut.
• Common gotcha: The chute must align perfectly with the deck’s discharge opening and bagger tube. If your mower has a mulching plug or side-discharge deflector, remove it first. Check that the bagger tube’s rubber seal isn’t torn – a worn seal reduces suction.
• Price note: At ~$97, it’s mid-range. OEM ensures fit, but aftermarket options exist for $30–$50 with less consistent quality.

Should You Buy It

Buy this if you need a direct OEM replacement for a broken or missing lower chute on an MTD, Craftsman, Troy-Bilt, or Cub Cadet mower with a compatible deck size. It’s a solid, easy install that restores bagging performance. Skip if your mower isn’t on the fitment list – measure first to avoid a return.