618P09255 618-09255 Lawn Mower Deck Blade Spindle Assembly Compatible with Cub Cadet XT1-LT50, 2022-2023 Troy-Bilt Super Bronco 50K XP w/50 Deck(618P09255)

What It Is

This is a replacement blade spindle assembly (part #618P09255 / 618-09255) for select Cub Cadet and Troy-Bilt lawn tractors with 50-inch fabricated decks. It houses the bearings and pulley that spin the mower blade—if it fails, the blade won’t spin or will wobble.

Fitment & Compatibility

Check before buying:

• Deck size & model: Fits Cub Cadet XT1-LT50 (50″ deck) and 2022-2023 Troy-Bilt Super Bronco 50K XP with 50″ fabricated deck. Not for stamped decks or smaller/larger decks.
• OEM vs aftermarket: This is a direct-fit aftermarket replacement for OEM Cub Cadet part 618P09255. Compare old spindle’s bolt pattern (typically 3-bolt) and shaft diameter (usually 5/8″ or 3/4″) to yours.
• Measurements: Spindle height and pulley diameter vary—measure your old spindle’s overall height and pulley OD to confirm match. Typical height is ~4.5″ and pulley ~4.5″ OD.
• Verify by removing one blade bolt first: If the spindle spins freely but the blade doesn’t, the spindle is likely seized. If it’s loose or noisy, replace it.

Key Things to Know

• Quality: Aftermarket unit with sealed bearings—should last 2-3 seasons under normal residential use. Not heavy-duty for commercial mowing.
• Installation difficulty: Moderate. You’ll need a socket set, a torque wrench (blade bolt to 70-90 ft-lbs), and possibly a puller if the old spindle is rusted. Expect 30-60 minutes per spindle.
• Common gotchas: Spindle bolts often seize—soak with penetrating oil overnight. The pulley may be reused if it’s in good shape, but check for cracks or worn grooves.
• Check deck belt: A failing spindle can wear the belt—inspect for fraying or glazing and replace if needed.

Should You Buy It

If your XT1-LT50 or Super Bronco 50K XP has a noisy, wobbly, or seized blade spindle, this is a solid budget-friendly fix. It’s not for heavy commercial use, but for residential mowing it’s a reliable drop-in replacement that saves you the cost of a dealer repair.