Tuningsworld Mower Spindle Assembly 3-Pack for Cub Cadet 50" Decks — Sealed Bearings & 5 3/8" Pulley

This is a 3-pack Tuningsworld replacement mower spindle assembly engineered to directly swap into Cub Cadet and MTD 50" deck models (fits OEM 918-04125B and cross-reference numbers) for reliable, like-for-like deck repair.

When a spindle fails on a 50-inch Cub Cadet or MTD deck, cutting performance and safety drop fast. Tuningsworld’s three-spindle kit gives you fully assembled replacements built to match the original dimensions and pulley specs so installation is straightforward. Each unit arrives preassembled with sealed bearings, a factory-size 5 3/8" pulley, and mounting hardware, saving you trips to parts dealers during mower maintenance.

How does this spindle assembly restore mower cutting performance?

Replacing worn or damaged spindles brings your deck back to correct blade spacing, runout, and belt alignment. These Tuningsworld spindles use die-cast aluminum housings and sealed heavy-duty bearings to reduce vibration and maintain blade speed under load.

• Matches original 1:1 size and star-center mounting pattern for plug-and-play replacement
• Sealed bearings reduce friction and extend service interval
• Thickened, anti-rust 5 3/8" pulley prevents belt slipping and power loss

Which mower models and OEM numbers are compatible?

This kit is designed for 50" deck tractors in the Cub Cadet and MTD family, including LT, SLT and RZT series variants specified for 50-inch decks. It cross-references multiple OEM part numbers so you can confirm fitment quickly before purchase.

• Common compatible models: Cub Cadet LT1050, RZT50, LGTX1050 and similar 50" deck tractors
• Replaces OEM numbers: 618-04125 / 618-04126 / 918-04125 / 918-04125A / 918-04125B / 918-04126 series
• 6-point star center hole aligns with original mounting pattern—no drilling or modification

What is included and how easy is installation?

The kit comes as three fully assembled spindle units with all necessary mounting bolts, so you won’t need additional hardware. Each spindle is shipped ready to install; basic mechanical skills and standard hand tools let most owners complete the swap in a single afternoon.

• Three assembled spindle housings with sealed bearings and pulleys
• Matching mounting bolts included—no extra screws required
• Fits direct into original deck holes; follow mower manual torque specs for safe reassembly

How durable are these spindles under normal mowing conditions?

Tuningsworld builds these assemblies with corrosion-resistant coatings and die-cast aluminum housings to withstand exposure to grass clippings, moisture, and routine vibration. The sealed bearing design keeps contaminants out, which helps maintain smooth rotation and reduces the risk of premature failure.

• Die-cast aluminum housings offer strength and reduced weight compared to cast iron
• Anti-rust coated pulleys for corrosion protection in outdoor environments
• Sealed heavy-duty bearings resist dust and water ingress for longer life

Who this is for: This Tuningsworld 3-spindle kit is ideal for homeowners and small-property landscapers who own Cub Cadet or MTD tractors with a 50" cutting deck and need a dependable, direct-replacement solution. Choose this set if you want a drop-in swap that matches OEM dimensions and pulley sizes, includes mounting hardware, and prioritizes sealed bearings and corrosion resistance for longer service life. If you’re restoring blade balance, fixing belt slippage, or replacing worn spindle housings on LT, SLT or RZT 50-inch decks, this kit provides the parts and simplicity needed to get your mower cutting properly again.