Blade Adapter Kit - Compatible with: MTD 756-0609, Includes 748-0377E (Same as 748-0377C) Adapter, 710-1251 Hex Bolt, 736-0524B (Same as 736-0524A) Blade Bell Support

What It Is

This blade adapter kit replaces the OEM MTD 756-0609 assembly, allowing you to mount a standard blade to the crankshaft on select MTD, Cub Cadet, Troy-Bilt, and Yard Machines mowers. It’s designed for machines with a 7/8-inch crankshaft diameter and a 5-point star blade mounting pattern.

Fitment & Compatibility

• Crankshaft size: Must be 7/8-inch diameter with a keyway. Measure your crankshaft shaft end before buying.
• Deck size: Works with most 38-, 42-, and 46-inch decks using MTD’s 5-point star blade mount (common on 2000s–2010s models).
• OEM cross-reference: Replaces MTD 756-0609. The included adapter (748-0377E) supersedes 748-0377C; the blade bell support (736-0524B) supersedes 736-0524A.
• Not for: Husqvarna, John Deere, or AYP-branded mowers with a different star pattern or round shaft. Also incompatible with 1-inch crankshafts.
• Check your model: Verify your mower’s deck part number or crankshaft diagram. Common compatible series include MTD 11A, 12A, 13A, and 14A.

Key Things to Know

• Installation difficulty: Easy (15-30 minutes) for anyone comfortable removing a blade bolt. Requires a socket wrench, torque wrench (recommended 40-50 ft-lbs), and a block of wood to hold the blade.
• Quality: Aftermarket kit; the hex bolt (710-1251) is grade 8.8, and the adapter is cast iron. Some users report the adapter fits slightly loose on the crankshaft—check for wobble before tightening.
• Gotcha: The blade bell support (736-0524B) must face the correct direction (concave side toward the blade). Reversing it can cause the blade to sit crooked and vibrate.
• Common issue: If your mower uses a left-hand thread bolt (rare on MTD), this kit’s right-hand bolt won’t work. Confirm your original bolt direction.

Should You Buy It

If you need a direct replacement for a worn or lost MTD 756-0609 adapter on a 7/8-inch crankshaft mower, this kit is a cost-effective choice (under $17) for DIY repairs. It’s not for heavy commercial use, but it’s fine for residential mowing. Skip it if you prefer OEM fitment or have a different shaft size.