UDC Parts Spindle Assembly for 50-inch Cub Cadet Mowers — Direct Replacement with Hardware

UDC Parts 918-06981 is a direct-replacement spindle assembly built to restore cutting performance on 50" Cub Cadet and compatible tractors.

This spindle assembly is engineered as an aftermarket substitute for worn or damaged deck spindles on 50-inch mowing decks. It recreates the mounting geometry and pulley configuration of the original, ships with the necessary fasteners, and is made from durable materials to withstand repeated use. If your mower blade wobbles, produces uneven cuts, or the spindle is visibly damaged, this unit provides the core mechanical components to get the deck spinning true again.

Which original parts and models does this replace?

This spindle is dimensioned and supplied to match several OEM part numbers and tractor models so you can replace the worn component without modifying the deck. It fits multiple Cub Cadet, Troy-Bilt, MTD, and Craftsman configurations designed for 50-inch decks.

• Replaces OEM numbers: Cub Cadet 918-06981, 618-06981; Troy-Bilt 918-06981, 618-06981; MTD 490-130-C016 / 490-130-F016; Craftsman CMXGZAM130016.
• Compatible tractors include Cub Cadet XT1-LT50, XT1-LT50 KH, XT2-LX50 Enduro models and various Craftsman and Columbia 50" tractors from 2015–2019.
• Also fits Troy-Bilt 50" models such as TB2350 and Super Bronco variants listed by model years.

What does the assembly include and what are its key dimensions?

The kit arrives ready to install with the fasteners you need and is sized to match the original spindle envelope. Knowing those dimensions helps verify compatibility with your deck before purchase.

• Contains: 1 spindle, 4 mounting bolts, 1 blade mounting bolt, 1 pulley lock nut, and 1 washer.
• Spindle dimensions: 6" (152 mm) overall height; pulleys measure 5" (128 mm) outer diameter; 6-point star mounting interface.
• Constructed from hardened materials for wear resistance and long service life under regular mowing conditions.

How will replacing a single spindle affect my mower's performance?

Replacing only the damaged spindle can restore blade alignment and reduce vibration without replacing the entire deck system. When installed correctly, the new spindle helps the blade track concentrically and maintain even cutting height.

• Reduces blade wobble and vibration caused by bent or worn spindles.
• Restores proper belt and pulley alignment to protect other deck components.
• Extends usable life of blades and deck by returning cutting stability.

Who is this for: This UDC Parts spindle assembly is intended for owners of 50" Cub Cadet, Troy-Bilt, Craftsman, Columbia, and compatible tractors who need a single replacement spindle to repair a damaged deck. It's a practical option for DIY mechanics and professional repair shops that require an exact-fit aftermarket spindle with included hardware and a straightforward install. If your deck uses one of the listed OEM part numbers or fits the specified models, this spindle provides a cost-effective route to get your mower cutting correctly again. The product also includes a 30-day warranty for defective units, offering a safety net during initial installation.