618-06980 918-06980 Spindle Assembly Fit for 50 Inch Mower Deck Cub Cadet Ultima ZT1-50 Enduro XT1-GT50 RZT-L50 RZT-S50 ZT-L50 KH KW RZT-50 Craftsman G8200 Troy Bilt Super Mustang Lawn Mower 3 Pack

What It Is

This is a three-pack of spindle assemblies designed to replace the OEM 618-06980 and 918-06980 spindles on 50-inch mower decks. It’s intended for zero-turn and garden tractors from Cub Cadet, Craftsman, and Troy-Bilt that use a three-spindle deck layout.

Fitment & Compatibility

Before buying, confirm your deck is exactly 50 inches wide and uses three spindles. This pack fits Cub Cadet Ultima ZT1-50, Enduro XT1-GT50, RZT-L50, RZT-S50, ZT-L50, and RZT-50 models, plus Craftsman G8200 and Troy-Bilt Super Mustang. It’s an aftermarket replacement for OEM part numbers 618-06980 and 918-06980. Measure the spindle housing diameter (typically 3.5 inches) and bolt pattern spacing (usually 4 inches center-to-center) to verify compatibility. Check your deck’s spindle pulley size—some deck variants use different pulley offsets.

Key Things to Know

• Quality vs OEM: Aftermarket spindles at this price point often use sealed bearings instead of greasable ones. Expect a shorter lifespan under heavy use or wet conditions.
• Installation difficulty: Moderate. You’ll need a socket set, wrench, and possibly a puller to remove the old spindle pulley. Expect 1–2 hours per spindle if deck removal is needed.
• Common gotcha: The included hardware may not match your existing bolts—keep your original pulley bolts and lock washers. Also, check that the spindle shaft length matches your blade adapter; some aftermarket units are slightly shorter.
• Deck removal: On many ZT1 models, you can replace spindles without removing the deck, but you’ll need to tilt or block the mower safely. On tractors like the XT1-GT50, deck removal is usually required.

Should You Buy It

If you need to replace all three spindles on a 50-inch Cub Cadet or compatible mower and want a budget-friendly option, this three-pack saves time and money compared to buying OEM singles. It’s best for DIY homeowners with moderate mechanical skills who don’t mow commercially or in heavy debris. If you mow daily or in sandy/dusty conditions, invest in OEM or heavy-duty aftermarket spindles with greasable bearings.