8TEN Spindle Assembly for 50-Inch Cub Cadet Decks — Mandrel Pulley with Grease Zerk, Direct OEM Fit

8TEN replacement spindle assembly engineered to restore cutting performance on select 50-inch Cub Cadet, MTD, Troy-Bilt and compatible zero-turn and lawn tractor decks.

This heavy-duty spindle swaps into a wide range of models that originally used OEM part numbers like Cub Cadet 918-04125B, 918-04125C and Toro 112-0370. Built with a precision mandrel pulley and a grease zerk fitting, the unit is crafted to match fit and function for 50-inch decks so you can get your mower back to a true, stable cut without modifying the deck or bolts.

Will this spindle fit my mower model?

If your machine lists any of the many compatible OEM numbers or models, this 8TEN spindle is a drop-in replacement. It's designed to work with numerous Cub Cadet, MTD, Troy-Bilt, Toro, Craftsman, White Outdoor, Huskee, Yard-Man, Mustang and other branded decks spanning many year ranges.

• Compatible OEM MPNs include 918-04125, 918-04125B/C, 918-04126 series and Toro 112-0370.
• Fits numerous Cub Cadet LGT/LGTX/LTX and RZT series (years listed in product specs).
• Also compatible with MTD, Craftsman, White Outdoor, Huskee, Mustang and similar models named in the compatibility list.

What features restore deck performance?

The assembly comes with a machined mandrel pulley and a grease fitting so bearings can be serviced, giving smoother blade spin and longer life. The spindle shaft is shaped to replace the common 6-point star pattern used on many factory units.

• Includes grease zerk for easy lubrication and extended bearing life.
• Mandrel pulley preinstalled to match belt seating and tension on 50-inch decks.
• Spindle shaft replaces 6-point star-pattern pulleys for direct compatibility.

How do I install and maintain this spindle?

Installation follows standard deck removal and spindle bolt torque procedures used by OEMs; most hobby mechanics can swap the unit using basic hand tools. After mounting, apply grease through the zerk fitting and check belt alignment before first use.

• Remove deck, unbolt old spindle, transfer blades if necessary, and install new spindle with correct torque.
• Lubricate through the grease fitting after installation and periodically as recommended by your mower manual.
• Verify blade balance and belt alignment to prevent vibration and premature wear.

Does this replace factory-quality parts?

This 8TEN spindle is manufactured to match critical dimensions and mounting patterns of the listed OEM parts, providing a reliable, cost-effective alternative to dealer replacement. It aims to restore original cutting geometry and belt tracking when installed correctly.

• Engineered to meet fitment and function expectations for the OEM numbers listed.
• Supplies the same mounting and pulley interfaces for seamless integration.
• Offers serviceable lubrication to extend life versus sealed, non-serviceable units.

Who this is for: Homeowners and small-property maintenance pros who need a dependable, serviceable spindle for 50-inch mower decks across many Cub Cadet, MTD, Toro and related models. If you want a direct-fit replacement with a mandrel pulley and grease zerk to restore smooth blade operation without custom work, this 8TEN assembly is built for that purpose.