3 Pack 918-06980 Spindle Assembly Replaces 918-06980, 618-06980 for Cub Cadet 50" ZT1 50 ZT2 50 XT1 GT50 RZT-S50 RZT-L50, Craftsman G8200 G8300, Troy-Bilt Super Mustang 50 Zero Turn Mowers

What It Is

This is a 3-pack of spindle assemblies designed to drive the cutting blades on zero-turn mowers with a 50-inch deck. It’s a direct replacement for worn-out OEM spindles on Cub Cadet, Craftsman, and Troy-Bilt models, restoring smooth blade rotation and clean cuts.

Fitment & Compatibility

Before buying, confirm your mower has a 50-inch deck—this won’t fit 42-inch or 54-inch decks. It replaces OEM part numbers 918-06980 and 618-06980. Compatible models include Cub Cadet ZT1 50, ZT2 50, XT1, GT50, RZT-S50, RZT-L50; Craftsman G8200, G8300; and Troy-Bilt Super Mustang 50. Measure your spindle bolt pattern (usually 3.5-inch center-to-center) and shaft diameter (typically 5/8-inch) to verify. Check your owner’s manual or existing part number before ordering—aftermarket spindles may differ slightly in bearing quality or shaft length.

Key Things to Know

• Quality: These are aftermarket spindles. Expect decent steel housings and sealed bearings, but they may not match OEM durability under heavy commercial use.
• Installation: Moderate difficulty. You’ll need a socket set, torque wrench (tighten spindle bolts to 30-40 ft-lbs), and a jack to lift the deck. Remove the blade, pulley, and old spindle; the new one bolts in directly.
• Common Gotchas: Check that the spindle shaft is long enough for your blade and pulley stack. Some users report needing to swap the pulley from the old spindle. Grease fittings may be absent—if so, pack bearings before installation.
• Pack: Comes as a 3-pack, so you can replace all spindles at once. This prevents uneven wear and vibration.

Should You Buy It

If you own one of the listed 50-inch zero-turn mowers and need to replace all three spindles on a budget, this 3-pack is a solid choice for DIY homeowners. It’s less expensive than buying OEM individually, but commercial operators may prefer OEM for longer bearing life. Verify fitment carefully—if your mower has a different deck or bolt pattern, look elsewhere.