Parts Camp Spindle Assembly for Cub Cadet RZT50 LT1050 50" Mower Deck — Greasable Bearing, 6‑Point Star Center

High-strength replacement spindle assembly engineered to fit Cub Cadet, Troy-Bilt, MTD and compatible 50" zero-turn and riding mower decks.

Replace a worn or damaged spindle with this Parts Camp unit designed for a wide range of mower models including Cub Cadet RZT50, LT1050 series and Troy-Bilt Mustang 50/54" decks. Built with greaseable bearings, a 6-point star center hole and threaded mounting with four bolts, this spindle restores blade stability and pulley alignment so you can cut evenly without extra vibration.

Which mower models and part numbers does this spindle match?

This spindle is made to be compatible with many factory part numbers and deck sizes. It fits original equipment references such as 618-04125A, 618-04126A, 918-04125B, 918-04126 series and similar Oregon, Rotary and Stens cross-references.

• Direct OEM fits: Cub Cadet LT/GTX/LGT/LTX series (2012–2014) and RZT50 (2006–2012)
• MTD/Columbia and ZT-series machines including GT5024/GT5025/ZT50 variants
• Troy-Bilt Mustang 54" and various 50" decks, some Craftsman and White Outdoor ZT-50 models
• Cross-reference: Oregon 11962, Rotary 82-403, Stens 285-867/285-312

How does this spindle improve deck performance?

Installing a correct spindle reduces wobble and blade runout, giving a sharper, more uniform cut. The greasable bearing and accurate pulley OD maintain belt alignment and prolong belt life when installed and lubricated properly.

• Zerk fitting enables regular greasing for longer bearing life and smoother rotation
• Precision pulley OD (approx. 5-3/8") keeps belt path consistent on compatible decks
• 6-point star center accepts multiple blade mounting styles for versatility
• Four-bolt threaded mount ensures a secure connection to the deck spindle housing

What are the key installation and compatibility details to check?

Before ordering, compare the spindle’s pulley outer diameter, mounting bolt pattern and center hole style to your existing part. Confirm your deck size and model year against the listed fits to ensure this spindle matches your mower.

• Verify center hole type (6-point star) and blade fitment (3- or 6-point blades accepted)
• Measure pulley OD and compare to your old spindle (approx. 5-3/8" on compatible models)
• Check that mounting uses four threaded bolts and a matching bolt circle on your deck
• Confirm the presence of a grease zerk location on your current spindle or housing

What maintenance should I do after installation?

Grease the spindle bearing through the zerk fitting shortly after installation and at regular intervals during the mowing season. Inspect blade bolts, pulley alignment and belt tension to keep the deck running reliably and to extend component life.

• Apply grease until fresh lubricant appears at bearing seals; repeat according to usage
• Torque blade and pulley hardware to manufacturer specifications after installation
• Check belt alignment and tension once the spindle is mounted and the deck is reassembled

Who this is for: Owners and technicians working on Cub Cadet, Troy-Bilt, MTD and compatible zero-turn and lawn tractor decks who need a durable, greaseable replacement spindle to restore cutting quality. It’s suited for do-it-yourself repairs and shop installations when the original spindle shows wear, bearing play, or pulley damage. If you’re unsure about fitment, compare bolt pattern, pulley diameter and center hole style to your existing spindle—or contact us with your mower model and serial for confirmation.