618-06980 918-06980 Spindle Assembly Fit for 50" Deck Cub Cadet ZT1-50 XT1-50 GT50 RZT-50 L50 S50 Troy-Bilt Super Mustang 50 Inch Deck Craftsman G8200 Z550 Zero Turn Mower Parts 3 Pack

What It Is

This is a 3-pack of spindle assemblies designed for 50-inch cutting decks on select Cub Cadet, Troy-Bilt, and Craftsman zero-turn and lawn tractors. Each spindle houses the bearings and pulley that drive a mower blade; if yours is wobbling, noisy, or not cutting evenly, these are the direct replacement.

Fitment & Compatibility

• Deck size is critical: Only for 50-inch decks. Measure your deck width before ordering.
• Confirmed models: Cub Cadet ZT1-50, XT1-50, GT50, RZT-50, L50, S50; Troy-Bilt Super Mustang 50"; Craftsman G8200, Z550.
• OEM cross-reference: Replaces OEM part numbers 618-06980 and 918-06980. Double-check your old spindle’s stamped number.
• Not universal: Will not fit 42" or 54" decks. Verify spindle bolt pattern (typically 3-bolt) and pulley diameter matches your deck.

Key Things to Know

• Quality note: Aftermarket set, but rated 4.7/5. Users report equal durability to OEM at lower cost. Greaseable bearings are a plus.
• Installation difficulty: Moderate. Requires basic tools (socket set, jack to lift mower). Expect 30–60 minutes per spindle.
• Common gotcha: Pulley may be slightly different depth than original. Check belt alignment after install; minor shimming may be needed.
• Pro tip: Replace all three at once to avoid uneven cutting and future downtime. Torque bolts to spec (usually 35–45 ft-lbs).

Should You Buy It

If you own one of the listed 50" Cub Cadet, Troy-Bilt, or Craftsman zero-turn mowers and your spindles are worn, this 3-pack offers good value for a DIY replacement. It’s ideal for homeowners who want to restore smooth, level cutting without paying dealer prices. Not for commercial use or odd-size decks.