LT42 Deck Spindle Assembly 618-06976 918-06976 Fits for MTD Cub Cadet 42 inch Deck XT1-LT42 XT2-LX42 131PA1ZS099 CYT4220 618-06976A 918-06976A (2 Pack)

What It Is

The LT42 Deck Spindle Assembly (618-06976 / 918-06976) is the rotating hub that drives your mower blades on 42-inch MTD and Cub Cadet lawn tractors. It replaces worn or failed spindles that cause blade wobble, uneven cutting, or deck vibration. Sold as a 2-pack, it’s a direct fit for models like the XT1-LT42, XT2-LX42, and CYT4220.

Fitment & Compatibility

Before buying, confirm your deck is a 42-inch MTD/Cub Cadet stamped deck (not fabricated). Check your old spindle’s part number—this kit matches OEM numbers 618-06976, 918-06976, 618-06976A, and 918-06976A. It fits models including XT1-LT42, XT2-LX42, 131PA1ZS099, CYT4220, and many others with a 42-inch deck from 2010 onward. Measure the spindle bolt pattern (typically 3-bolt, 3.5-inch center) and verify the shaft diameter (5/8-inch). If your deck uses a different bolt pattern or shaft size, this won’t work.

Key Things to Know

• Quality: Aftermarket replacement, but rated 4.8/5 from 93 reviews—users report it matches OEM durability at a lower price.
• Installation difficulty: Moderate. You’ll need a socket set, wrench, and possibly a puller to remove the old spindle pulley. Allow 1–2 hours per spindle.
• Common gotchas: The pulley nut may be reverse-threaded on some models (check your manual). Also, these come without grease fittings—some users add a zerk fitting for future lubrication.
• Bearing noise: A few reviews note slight noise initially; this usually settles after a few minutes of run time. If it persists, ensure the spindle is torqued to spec (typically 30–40 ft-lbs).

Should You Buy It

If you have a 42-inch MTD or Cub Cadet tractor with a worn or noisy spindle, this 2-pack is a solid value—costs less than a single OEM spindle and matches fitment for most common models. It’s best for DIYers comfortable with basic deck removal and pulley work. Skip it if your deck is not a 42-inch MTD/Cub Cadet or if you need a spindle with pre-installed grease fittings.