UP2WIN Spindle Assembly 918-04126 for Cub RZT50 LT1050 50-in Mower Deck

Overview

The UP2WIN spindle assembly with part number 918-04126 is designed as a practical replacement for worn spindles on select Cub and Troy-Bilt zero-turn mowers that use a 50-inch deck. It aims to restore consistent blade engagement and cutting performance, offering a solid option for seasonal maintenance without overpromising results.

Built to fit a range of Cub models and the Troy-Bilt Mustang 50-inch deck, this spindle emphasizes straightforward service and durable operation, helping you stay productive in yard work from season to season.

Key Features

• Compatible with Cub LT1050, LT1550, LT1554, LTX1050, LGTX1054, SLT1550, RZT50 and the 50-in Trojan-Bilt Mustang deck
• Replaces multiple part numbers for flexible upgrading (includes common replacements such as 918-04126 and 618-04126 variants)
• Pre-greased with a grease fitting to support routine maintenance and potentially longer service life
• Includes four threaded mounting bolts to simplify installation and future removal
• Pulley OD is 5 3/8 inches; overall height is 6.3 inches; features a 6-pt center hole for a secure hub

What’s Included and Compatibility

• Replaces: 918-04126, 918-04125, 618-04126, 618-04125 and related numbers
• Designed for 50-inch mower decks on Cub and Troy-Bilt models

Installation and Use

The spindle comes pre-greased and ready for installation, with a grease fitting for periodic service. Before installing, verify fitment and torque bolts to the recommended specification. Regular inspection can help maintain balance and cutting performance.

Why Consider UP2WIN

Upgrading to a compatible spindle can help maintain blade speed and reduce noise during mowing. The design prioritizes durability and broad compatibility, offering a practical maintenance option without promising guaranteed outcomes.