618-09255 Deck Spindle Assembly for 50" Lawn Mower Deck, Compatible with Cub Cad-et XT1-LT50, Troy-Bilt Super Bronco 50 XP, 50K XP, Replaces 618P09255, 1 Pack

What It Is

This deck spindle assembly (model 618-09255) is the rotating hub that drives the mower blade on 50-inch lawn mower decks. Designed for residential zero-turn and lawn tractors, it replaces a worn or damaged spindle to restore blade rotation and cutting performance.

Fitment & Compatibility

Before buying, confirm these points:

• Deck size: Only for 50-inch decks. Measure your deck width to be sure.
• Brand/model fits: Cub Cadet XT1-LT50, Troy-Bilt Super Bronco 50 XP, and 50K XP. Also fits some MTD-built units with 50-inch decks.
• OEM part numbers: Replaces OEM 618P09255 and 918-09255. Cross-check your old spindle’s number.
• Physical dimensions: Shaft diameter is 5/8 inch; overall height approx. 4.5 inches. Measure your old spindle height and shaft size if possible.
• Bearing type: Sealed ball bearings (pre-lubricated, non-serviceable). No grease fitting.
• Bolt pattern: Three-bolt flange with 3-inch bolt circle. Verify your deck’s mounting hole pattern.

Key Things to Know

• Quality: Aftermarket part, not OEM. Bearing quality may be lower than original; inspect for smooth rotation before installing.
• Installation difficulty: Moderate. Requires removing the blade, belt, and pulley, then unbolting the old spindle. You’ll need a socket set and a torque wrench (tighten flange bolts to 25–30 ft-lb).
• Common gotcha: The spindle pulley may not be included. Reuse your old pulley if it’s in good shape; if worn, buy separately.
• Belt alignment: After installation, check belt alignment on the pulley. Misalignment causes premature belt wear.

Should You Buy It

This is a solid budget-friendly option if your Cub Cadet or Troy-Bilt 50-inch deck needs a spindle replacement and you’re comfortable with moderate DIY work. It’s not for high-hour commercial use—the sealed bearings won’t last as long as premium OEM units. But for residential mowing, it’s a reliable fix at half the OEM price.