Replacement Lawn Mower Spindle Assembly with Pulley Set of 2 - Compatible with Cub Cadet, Troy-Bilt, MTD 42 Inch Deck - Replaces 918-04822B, 618-04822, 618-04822A, 618-04822B, 918-04889, 91804889A

What It Is

This is a set of two replacement spindle assemblies with pre-installed pulleys, designed for 42-inch cutting decks on select Cub Cadet, Troy-Bilt, and MTD lawn tractors. Each spindle houses the bearings that allow the blade to spin, and the pulley drives the belt from the engine or deck drive system.

Fitment & Compatibility

Before buying, confirm your deck is exactly 42 inches (measured blade tip to blade tip) and that your mower uses a three-blade, side-discharge setup. This set replaces OEM numbers 918-04822B, 618-04822, 618-04822A, 618-04822B, 918-04889, and 91804889A. It fits many Cub Cadet LT, RZT, and GT models, plus Troy-Bilt and MTD tractors from the early 2000s to present. Measure the spindle shaft diameter (typically 5/8 inch) and the pulley diameter (usually 4 inches) to verify. If your deck uses a different pulley size or a splined shaft, this won’t work.

Key Things to Know

• Quality vs. OEM: These are aftermarket spindles. They use sealed bearings and a steel housing, but the build may be slightly lighter than OEM. Most users report 2–3 seasons of normal residential use.
• Installation difficulty: Moderate. You’ll need a jack, socket set, and a torque wrench. Expect 30–60 minutes per spindle. The pulley is pre-installed, but you may need to transfer the blade adapter and washer from your old spindle.
• Common gotcha: The included lock washer and nut may not match your original hardware. Use the supplied hardware, or reuse your old ones if they fit. Also, check that the pulley aligns with the belt path—some users report a slight offset that requires shimming.
• Bearing noise: A small number of reviews note bearing noise after a few hours. If you hear grinding, stop immediately and inspect for debris or damage.

Should You Buy It

If you need a budget-friendly, drop-in replacement for a worn or wobbling spindle on a 42-inch Cub Cadet, Troy-Bilt, or MTD deck, this set offers good value for the price. It’s not for heavy commercial use or decks requiring exact OEM tolerances, but for residential mowing, it’s a solid choice that saves money over buying two separate OEM spindles.