Braveboy Lawn Mower 964-04154 Grass Bag Frame Set & 731-07131 Side Discharge Chute, Compatible with MTD Craftsman Mower, MTD Mower Series 11A 12A & 12B

What It Is

This is a two-piece replacement set for MTD and Craftsman walk-behind mowers: a grass bag frame (964-04154) and a side discharge chute (731-07131). It’s designed to replace worn, broken, or missing bag support frames and discharge deflectors on select 11A, 12A, and 12B series mowers.

Fitment & Compatibility

Before buying, verify your mower’s model number (found on a sticker under the seat or on the rear frame). This set fits MTD and Craftsman mowers with deck sizes typically between 21” and 30”, but only those in the 11A, 12A, and 12B series. It does not fit 13-series or older 10-series decks. The grass bag frame is a direct OEM replacement for MTD part 964-04154; the side chute replaces 731-07131. If your mower uses a different bag attachment system (e.g., quick-attach hooks vs. pin-style), it won’t work. Measure your existing bag frame width and chute mounting hole spacing (approx. 5” center-to-center) to confirm.

Key Things to Know

• Quality vs. OEM: Users report the frame is sturdy but slightly thinner gauge metal than original MTD parts. It holds up for residential use but may bend under heavy commercial loads.
• Installation difficulty: Easy—usually takes 10-20 minutes. No special tools beyond a socket wrench and maybe a screwdriver. The side chute snaps into the deck’s pivot tab; the frame hooks onto the mower’s rear bracket.
• Common gotcha: The grass bag frame may need gentle bending to align with the bag hooks on some Craftsman models. Check that your bag itself has the correct hook spacing (most standard 3-bag systems work).
• No bag included: This is just the frame and chute—you’ll need to reuse your existing grass bag or buy one separately.

Should You Buy It

If you own a MTD/Craftsman 11A, 12A, or 12B mower with a broken bag frame or missing side chute, this is a solid, cost-effective fix. It’s not for heavy-duty commercial mowers or older series decks, but for typical residential use, it restores full bagging and discharge functionality at a fair price.