50 Inch Deck Spindle Assembly Replacement 618-09255 618p09255 Fits for Cub Cadet XT1-LT50 Troy Bilt Super Bronco 50 XP 50K Lawn Mower

What It Is

This is a replacement spindle assembly for the 50-inch cutting deck found on select Cub Cadet and Troy-Bilt lawn tractors. It houses the bearing and pulley that spin the blade; you need one when the original spindle seizes, wobbles, or makes grinding noises.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: Must be a 50-inch deck (e.g., Cub Cadet XT1-LT50, Troy-Bilt Super Bronco 50 XP, 50K). This part will not fit 42-inch or 54-inch decks.
• OEM cross-reference: Directly replaces OEM part numbers 618-09255 and 618P09255. If your machine uses a different spindle number, it won’t fit without modification.
• Physical check: Measure the spindle housing height (approx. 5.75 inches) and the pulley diameter (approx. 4.5 inches). Compare to your old spindle—aftermarket spindles sometimes have different pulley bolt patterns or shaft lengths. Also confirm your deck uses a 5/8-inch blade shaft (common for these models).

Key Things to Know

• Quality concerns: Only 2 reviews at 3.9 stars—limited feedback. Some aftermarket spindles have weaker bearings or thinner housing than OEM. Inspect the bearing smoothness before installing.
• Installation difficulty: Moderate. You’ll need a socket set, a jack to lift the mower, and possibly an impact wrench for stubborn bolts. Plan 1–2 hours if you’re handy, longer if rusted.
• Common gotchas: The pulley might not be pre-installed—you may need to reuse your old pulley and bolt. Also, check the blade bolt torque spec (usually 70–90 ft-lbs) to avoid stripping the shaft.
• Deck removal: You can often replace a spindle without removing the deck, but it’s easier to slide the deck out from under the tractor for access.

Should You Buy It

If you need a budget-friendly replacement for a worn spindle on a Cub Cadet XT1-LT50 or Troy-Bilt Super Bronco 50-inch deck, this will work—but with limited reviews, inspect it carefully before installing. For a more proven option, consider OEM Cub Cadet 618-09255 if you prefer guaranteed fit and longer bearing life.