918-04822A 918-04822B 618-04822 918-04889 Spindle Assembly - Replace for MTD, Troy-Bilt, Craftsman, Cub Cadet 30in Mini Riders and 42 inch Zero-Turn Mowers Deck - with Blade Nut, 2 Pack

What It Is

This is a replacement spindle assembly (2-pack) for the cutting deck on select 30-inch mini riders and 42-inch zero-turn mowers from MTD, Troy-Bilt, Craftsman, and Cub Cadet. It includes the blade nut and houses the bearings that spin the mower blade—essential for a smooth cut and vibration-free operation.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Fits 30-inch mini riders (e.g., RZT, LT series) and 42-inch zero-turn mowers. Check your mower’s deck width.
• OEM cross-reference: Replaces OEM part numbers 918-04822A, 918-04822B, 618-04822, and 918-04889. Common on Cub Cadet RZT 42, Troy-Bilt Mustang 42, and Craftsman ZT 7000 models.
• Measurements: Spindle housing is ~4.5 inches tall with a 1-inch diameter shaft. Pulley bolt pattern is 4-bolt (3.5-inch center-to-center). Confirm your existing spindle matches these dimensions.
• Brand note: This is an aftermarket replacement, not OEM Cub Cadet. It works on most MTD-built decks but may have slightly different bearing quality than factory parts.

Key Things to Know

• Quality: Bearings are sealed and pre-greased—good for moderate use. Heavier commercial use may wear them faster than OEM.
• Installation: Moderate difficulty—requires removing the deck, belt, pulley, and blade. You’ll need a socket set, torque wrench (blade nut to 35-40 ft-lbs), and possibly a puller for stuck pulleys.
• Gotcha: The included blade nut may not match your original blade’s thread pitch. Check that your blade uses a 5/8-inch-18 thread before final assembly.
• Common issue: If your old spindle wobbled, the bearing housing may be damaged—inspect the deck mounting plate for cracks before installing the new one.

Should You Buy It

Buy this if you own a 30-inch mini rider or 42-inch zero-turn from MTD, Troy-Bilt, Craftsman, or Cub Cadet and need a cost-effective replacement for worn or noisy spindles. It’s a solid value for homeowners with moderate mowing—skip it for daily commercial use where OEM bearings last longer.