Lawn Mower Deck Spindle Assembly Compatible with Cub Cadet XT1‑LT50 & Troy‑Bilt Super Bronco 50 XP / 50K XP 50" Deck – Replaces 618‑09255, 618P09255

What It Is

This is a replacement deck spindle assembly for 50" cutting decks on Cub Cadet XT1‑LT50 and Troy‑Bilt Super Bronco 50 XP / 50K XP lawn tractors. It drives the blade, houses the bearings, and mounts to the deck via three bolts.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: Must be exactly 50" (not 46" or 54").
• Model numbers: Confirmed fit for Cub Cadet XT1‑LT50 (all variants) and Troy‑Bilt Super Bronco 50 XP / 50K XP. Also fits some MTD‑built tractors with 50" decks using OEM part 618‑09255 or 618P09255.
• Measurements: Spindle shaft diameter is 5/8" (fits standard 5/8" arbor blades). Bolt pattern is 3.25" center-to-center. Overall height is ~4.5". If your old spindle has a different shaft length or bolt spacing, it won’t swap.

Key Things to Know

• Quality: Aftermarket part at a budget price. Bearings are sealed but not heavy‑duty; expect 2–3 seasons of normal residential use. Not for commercial mowing.
• Installation: Moderate difficulty. You’ll need a socket set, a breaker bar for the blade bolt (likely reverse‑thread on some models), and a jack to lift the deck. No special tools required.
• Common gotchas: The blade bolt torque spec is 70–90 ft‑lbs. Over‑tightening can warp the housing. Use anti‑seize on the shaft to prevent future rust‑seizure.
• Warranty: Typically 30–90 days from the seller. No OEM support.

Should You Buy It

If you own a Cub Cadet XT1‑LT50 or Troy‑Bilt Super Bronco with a 50" deck and need a quick, low‑cost spindle replacement for light‑duty residential mowing, this is a solid value. Skip it if you run a commercial operation or want OEM‑grade bearings—spend twice as much on a genuine Cub Cadet spindle for longer life.