MTD 787-01869B-4044 21" Deck 3n1 for Murray Yard-Machines Craftsman Sure Precision Plus inch Cut B2M7 B2J1 B2JI B29Q

What It Is

This is a 21-inch stamped steel cutting deck assembly (OEM part number 787-01869B-4044) designed for select Murray, Yard-Man, Craftsman, and Sure Precision Plus walk-behind mowers. It replaces a worn or rusted original deck, restoring the mower’s ability to bag, mulch, or side-discharge (3n1 capability).

Fitment & Compatibility

Before buying, verify your mower’s model number (not just brand). This deck fits specific Murray and Craftsman platforms with the following model prefixes: B2M7, B2J1, B2JI, B29Q. It is a direct OEM replacement for the original 787-01869B-4044 deck. Key checks:

• Deck size: Must be exactly 21 inches (measured blade tip to blade tip).
• Mounting pattern: The deck uses four bolts at the front and two at the rear—measure your old deck’s bolt spacing.
• Spindle assembly: This deck includes the spindle and blade adapter, but you may need to transfer your original blade, pulley, and hardware.
• Brand cross-reference: Also fits certain Yard-Machines and Sure Precision Plus models with the same prefix; check your mower’s manual or parts diagram.

Key Things to Know

• Quality: Stamped steel, not fabricated—durable for residential use but lighter than commercial decks. Expect it to last several seasons with normal care.
• Installation difficulty: Moderate. You’ll need basic tools (socket set, wrenches) and should support the mower securely. Plan 45–90 minutes.
• Common gotchas: The deck may not include a discharge chute or grass catcher adapter—reuse your old parts. Also, the blade bolt size is 5/8″; ensure your blade and washer are compatible.
• Paint finish: Bare steel with a thin black coating—touch up any bare spots immediately to prevent rust.

Should You Buy It

If your existing deck is cracked, rusted through, or bent beyond repair, this is the correct OEM replacement for compatible Murray/Craftsman 21″ mowers. It restores full 3n1 function and avoids the fitment headaches of aftermarket decks. Not ideal if your mower uses a different deck size or mounting pattern.