Antanker spindle assembly for 50" mower deck — OEM-fit 50-inch replacement, greasable pulley

This heavy-duty Antanker spindle assembly is a direct OEM-fit replacement for 50" mower decks used on Cub Cadet, MTD and Troy-Bilt RZT50/LT1050 series, offering a greasable, bolt-on mandrel with 6-point star center for reliable blade retention.

If your 50-inch cutting deck is showing vibration, noisy bearings, or uneven cut height, replacing the spindle is often the most effective repair. Antanker's 618-04126 / 918-04126 spindle is manufactured to match original equipment dimensions and mounting patterns so it installs quickly and restores deck performance without expensive dealer service.

How will this spindle improve my mower's cutting performance?

Worn spindles cause wobbling blades, striping, and inconsistent deck speed. Installing a properly sized replacement reduces blade play and keeps the pulley aligned with the belt, which helps restore a level, even cut and quieter operation.

• Precisely matched pulley outside diameter for correct belt tension and speed.
• Six-point star center secures 3- and 6-point blades for stable blade mount.
• Pre-greased bearings and zerk fitting reduce friction and noise.

Will this part fit my specific mower model?

Antanker engineered this spindle to be compatible with a wide range of Cub Cadet, MTD and Troy-Bilt decks that use the 50" mounting pattern. Cross-reference the listed part numbers and deck size to confirm fit before ordering.

• Replaces OEM numbers 618-04126, 918-04126 and several 918/618 variants.
• Designed for 50-inch decks used on LT1050, RZT50 and comparable models.
• Pre-threaded 8mm mounting holes and included self-tapping screws speed installation.

How difficult is installation and what tools are needed?

The assembly is intended for bolt-on replacement and is straightforward with basic hand tools. Expect a short driveway- or garage-side job for anyone comfortable supporting the deck and removing the blade and old spindle.

• Requires blade removal, deck support, and socket/wrench set for mounting bolts.
• Includes 4 self-tapping screws; uses standard 8mm mounting hardware pattern.
• 6-1/3" overall height and 5-3/8" pulley OD match common OEM dimensions for quick swap.

What maintenance does this spindle need for long life?

This spindle ships pre-greased and includes a zerk fitting so you can maintain bearing lubrication easily. Regular greasing and inspection of mounting hardware keep the spindle running smoothly for many mowing seasons.

• Grease through the zerk every 25–50 operating hours or per mower manual guidance.
• Check pulley runout and blade tightness after initial installation.
• Replace seals or bearings at first sign of water ingress or rough rotation.

Who is this for: This Antanker spindle assembly is ideal for DIY owners and small-fleet caretakers who want a cost-effective, OEM-dimension replacement for 50" mower decks on Cub Cadet, MTD and Troy-Bilt machines. Choose it if you need a greasable, durable mandrel that restores blade stability and reduces deck vibration without a dealer visit.