748-0376E Lawn Mower Blade Adapter for MTD Troy-Bilt Craftsman Bolens Yard Machines Cub Cadet Ryobi Yard Man Push Walk-Behind Mower 748-0376 748-0376A 748-0376B 748-0376C

What It Is

This is a replacement blade adapter (part 748-0376E) that connects the mower blade to the engine crankshaft on most MTD-built push and walk-behind mowers. It’s designed for standard 5/8-inch or 7/8-inch center hole blades and is commonly used on Troy-Bilt, Craftsman, Bolens, Yard Machines, Cub Cadet, Ryobi, and Yard Man models.

Fitment & Compatibility

Before buying, check these three things:

• Deck size & model series: Fits most 21-inch, 22-inch, and 24-inch walk-behind decks from MTD brands. Works with single-blade and some twin-blade setups. Not for zero-turn or riding mowers.
• Crankshaft type: Requires a vertical crankshaft with a 5/8-inch diameter and a keyway. Measure your crankshaft end—if it’s 3/4-inch or has a different keyway shape, this adapter won’t fit.
• OEM vs aftermarket: This is a genuine Cub Cadet part, but it’s identical to MTD OEM part 748-0376, 748-0376A, 748-0376B, and 748-0376C. Aftermarket versions exist but often have looser tolerances—stick with OEM for a snug fit.
• Blade compatibility: Accepts blades with a 5/8-inch or 7/8-inch center hole. Measure your blade’s center hole before ordering.

Key Things to Know

• Installation difficulty: Easy—takes about 10 minutes. You’ll need a socket wrench and a torque wrench (45-55 ft-lbs). No special tools required beyond standard wrenches.
• Common gotcha: The adapter has a raised center hub that must face upward (toward the deck). Installing it upside down will cause the blade to sit too low and hit the ground.
• Durability: Cast aluminum—lightweight but can crack if over-torqued or if the blade hits a hidden rock. Inspect for hairline cracks after any heavy impact.
• Wear indicator: If your blade wobbles or vibrates excessively, the adapter’s keyway or center hole is likely worn. Replace immediately—a loose blade can shear the crankshaft.

Should You Buy It

Buy this if you need a direct OEM replacement for an MTD, Cub Cadet, or Troy-Bilt walk-behind mower and want a guaranteed fit without measuring or modifying. Skip it if you have a different brand (Honda, Toro, John Deere) or a riding mower—those use different crankshaft sizes and adapter shapes. For $12.99, it’s a fair price for a genuine part that will last several seasons with normal use.