8TEN Spindle for MTD Cub Cadet RZT 50 LT1050 918-04126B 918-04125 618-04126 3 Pack

What It Is

This is a 3-pack of replacement spindle assemblies for MTD, Cub Cadet, and Troy-Bilt lawn tractors with 50-inch or 54-inch fabricated decks. The spindle houses the blade pulley and bearing, transferring engine power to the cutting blade.

Fitment & Compatibility

Verify before purchase:

• Deck size: Fits 50" and 54" fabricated decks. Not for stamped decks.
• OEM cross-references: Replaces 918-04126B, 918-04125, 618-04126, and 718-04126.
• Machine models: MTD Yard Machines, Cub Cadet RZT 50, LT1050, LT1042, LT1045, LT1046, LT1054, and similar. Also fits Troy-Bilt and Huskee models with the same deck.
• Measurements: Spindle shaft diameter is 5/8". Pulley mounting hole pattern is 2.75" center-to-center. Overall height is roughly 5.5". Measure your old spindle to confirm.
• Aftermarket vs OEM: This is a quality aftermarket replacement, not a factory Cub Cadet part. Works fine but may have slight cosmetic differences.

Quick check: Look at your deck’s underside. If the spindle housing has three mounting bolts in a triangular pattern and a grease fitting on top, this fits.

Key Things to Know

• Quality: 8TEN spindles are generally well-reviewed. Use the included grease fitting and apply fresh grease before first use. Sealed bearings reduce maintenance.
• Installation difficulty: Moderate. Requires removing the deck, blade, pulley, and three mounting bolts. A pulley puller is often needed for the old spindle. Budget 1-2 hours for all three.
• Common gotchas: The pulley retaining bolt may be reverse-threaded on some decks. Check your manual. Also, the spindle housing bolt pattern can vary slightly—verify your deck’s bolt spacing before buying.
• Warranty: 8TEN offers a 1-year warranty. Keep the packaging and receipt.

Should You Buy It

If you have an MTD, Cub Cadet, or Troy-Bilt with a 50" or 54" fabricated deck and need to replace worn or wobbly spindles, this 3-pack is a solid value. It’s cheaper than OEM, has good reviews, and includes everything needed for a complete spindle swap. Best for DIY owners comfortable removing the deck and using basic hand tools. Not for stamped decks or smaller mowers.