618-06981 Spindle Assembly / 50 inch Deck/for MTD 918-06981 Cub Cadet Columbia Troy Bilt XT1-LT50 XT2-LX50 TB2350（1Pack）

What It Is

The 618-06981 spindle assembly is the rotating hub that drives your mower blades. It’s designed for 50-inch deck MTD-style lawn tractors, including Cub Cadet, Troy-Bilt, and Columbia models like the XT1-LT50, XT2-LX50, and TB2350.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Must be a 50-inch deck (not 42, 46, or 54). Measure blade tip-to-tip if unsure.
• Model series: Fits Cub Cadet XT1-LT50, XT2-LX50, Troy-Bilt TB2350, and Columbia 50-inch decks. Also works on many MTD 50-inch decks (check your OEM part number against 918-06981).
• Physical check: The spindle shaft is 5/8-inch diameter with a 3-inch bolt pattern. Measure your old spindle’s bolt hole spacing and shaft diameter before ordering. This is an aftermarket replacement, not OEM Cub Cadet.

Key Things to Know

• Quality note: With only 2 reviews (5 stars), long-term durability is unproven. Budget-friendly, but expect it to last 1-2 seasons on heavy use.
• Installation: Moderate difficulty. You’ll need a jack to lift the deck, a socket wrench, and possibly a puller to remove the old spindle. The new one bolts directly in—no mods needed.
• Common gotcha: The included grease fitting is pre-installed. Don’t over-grease or you’ll blow the seal. Two pumps per season is enough.
• Pack quantity: This is a single spindle assembly (1 pack). If you’re replacing all three on a 50-inch deck, you need to buy three.

Should You Buy It

Buy this if you have a 50-inch MTD-style deck and want a low-cost, direct-fit replacement for a worn or noisy spindle. It’s ideal for light-duty residential mowing. Skip it if you need OEM quality for commercial use or if your deck isn’t exactly 50 inches—measure first.