8TEN Spindle for MTD 918-04126B Cub Cadet Troy-Bilt 50 inch Deck 918-04125B 618-04126 1120370

What It Is

This is a replacement spindle assembly for 50-inch MTD/Cub Cadet/Troy-Bilt lawn tractor decks. It drives the blade rotation via the belt and houses the bearings that keep the blade spinning smoothly.

Fitment & Compatibility

• Primary fits: MTD 918-04126B, 918-04125B, 618-04126, and OEM part 1120370.
• Decks: 50-inch side-discharge or mulching decks on Cub Cadet (LT/LX/GT series), Troy-Bilt (Bronco, Pony, Super Bronco), and MTD Yard Machines.
• Check before buying: Measure the spindle shaft diameter (typically 5/8-inch) and overall height (approx. 6 inches). Verify your deck’s spindle mount pattern (three-bolt, 2.75-inch bolt circle). Ensure your blade center hole matches the spindle’s pilot (usually 5/8-inch round).
• Aftermarket note: This is an aftermarket replacement for OEM 918-04126B—identical dimensions but not factory-branded. Works as a direct swap.

Key Things to Know

• Quality: 4.6 stars from 745 reviews—users report good bearing life and metal housing. Some note the bearings are sealed, not serviceable; replace as a unit when worn.
• Installation difficulty: Easy (1-2 hours). Requires removing deck, unbolting old spindle, transferring the pulley and blade, and re-torquing to ~40 ft-lbs. Use thread locker on the mounting bolts.
• Common gotcha: The spindle may ship without a grease fitting (most are sealed). If your deck uses a greaseable spindle, you’ll need to buy a different model.
• Price: $25.95—significantly cheaper than OEM ($40-60). Worth it for a DIY replacement.

Should You Buy It

Yes, if you need a reliable, affordable replacement for a worn or noisy spindle on a 50-inch MTD-family deck. It’s a solid choice for budget-conscious DIYers who want a direct fit without paying OEM markup. Avoid if you require a greaseable spindle or need OEM branding for warranty/insurance reasons.